SMD code search: identify a part by its marking

3 parts are printed L70A

Not sure which one you have?

Answer up to 4 quick questions and these 3 parts are ranked, with a meter test that settles it. It works on a dead part too.

APL3570ADFNLoad switch, AnpecLoad switchDFNNot recordedAnpec
What it is
Load switch
Maker
Anpec
Package
DFN
Pins
Not recorded
Details
Single Channel Power-Load Switch
Source
Manufacturer datasheet
Is it dead?
Voltage, board powered, black probe on ground.
Working, it reads
Switched on, the output pin sits at the input voltage. Switched off, it sits near 0 V.
Dead, it reads
Output at the input voltage while switched off: the pass element has shorted.
Input present and switched on, no output: failed open, or shut down into a shorted load. Power off and measure output to ground.
On the board:
An output near 0 Ω to ground is usually the load. Lift the output pin to see which.
Compare:
If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
Watch for:
The pinout and whether the enable is active high or low differ between parts. The datasheet gives both.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Datasheetfor APL3570A, opens in a new tab
SMLG70ASMCGTVS diode, 2 pins, Microsemi Integrated Products DivisionTVS diodeSMCG2 pinsMicrosemi Integrated Products Division
What it is
TVS diode
Maker
Microsemi Integrated Products Division
Package
SMCG
Pins
2
Details
Transient voltage supressor: Vrwm=70V, Vbr=77.8..86.0V, Ipp=26.6A, 3000W(1ms)
Source
Published code list
Is it dead?
Diode range, from the protected line to ground, part lifted if you can.
Working, it reads
A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.
Dead, it reads
From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
A reading both ways on a one-way part: leaky.
A one-way part open both ways: failed open.
On the board
, a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
Compare:
The same part on the next line or connector pin is the healthy reading to compare with.
Watch for:
A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
SMLJ70ASMCTVS diode, 2 pins, Microsemi Integrated Products DivisionTVS diodeSMC2 pinsMicrosemi Integrated Products Division
What it is
TVS diode
Maker
Microsemi Integrated Products Division
Package
SMC
Pins
2
Details
TVS: 70V, 26.6A, 3000W(1ms)
Source
Published code list
Is it dead?
Diode range, from the protected line to ground, part lifted if you can.
Working, it reads
A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.
Dead, it reads
From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
A reading both ways on a one-way part: leaky.
A one-way part open both ways: failed open.
On the board
, a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
Compare:
The same part on the next line or connector pin is the healthy reading to compare with.
Watch for:
A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

42 more parts are printed with a code easy to misread as L70A

Printed with a code easy to misread

One character differs, and it is one that is easy to confuse under a lamp. The odd one out is marked on each.

1.5SMC170Aprinted 170ASMCTVS diode, 2 pins, DOWOTVS diodeSMC2 pinsDOWO
Printed 170A on the part. Easy to misread as L70A. Check that character with a loupe before you order anything.
What it is
TVS diode
Maker
DOWO
Package
SMC
Pins
2
Source
Manufacturer datasheet
Is it dead?
Diode range, from the protected line to ground, part lifted if you can.
Working, it reads
A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.
Dead, it reads
From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
A reading both ways on a one-way part: leaky.
A one-way part open both ways: failed open.
On the board
, a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
Compare:
The same part on the next line or connector pin is the healthy reading to compare with.
Watch for:
A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Datasheetfor 1.5SMC170A, opens in a new tab
3.0SMC170A3.0SMC170CAprinted 170ASMCTVS diode, 2 pins, YFWTVS diodeSMC2 pinsYFW
Printed 170A on the part. Easy to misread as L70A. Check that character with a loupe before you order anything.
What it is
TVS diode
Maker
YFW
Package
SMC
Pins
2
Source
Manufacturer datasheet
Is it dead?
Diode range, from the protected line to ground, part lifted if you can.
Working, it reads
A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.
Dead, it reads
From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
A reading both ways on a one-way part: leaky.
A one-way part open both ways: failed open.
On the board
, a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
Compare:
The same part on the next line or connector pin is the healthy reading to compare with.
Watch for:
A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Datasheetfor 3.0SMC170A3.0SMC170CA, opens in a new tab
GSF2TVS170Aprinted 170ASOD-123FTVS diode, 2 pins, Good-ArkTVS diodeSOD-123F2 pinsGood-Ark
Printed 170A on the part. Easy to misread as L70A. Check that character with a loupe before you order anything.
What it is
TVS diode
Maker
Good-Ark
Package
SOD-123F
Pins
2
Details
TVS diode, 200 W
Source
Manufacturer datasheet
Is it dead?
Diode range, from the protected line to ground, part lifted if you can.
Working, it reads
A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.
Dead, it reads
From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
A reading both ways on a one-way part: leaky.
A one-way part open both ways: failed open.
On the board
, a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
Compare:
The same part on the next line or connector pin is the healthy reading to compare with.
Watch for:
A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Datasheetfor GSF2TVS170A, opens in a new tab
P4SMA170Aprinted 170ASMATVS diode, 2 pins, DOWOTVS diodeSMA2 pinsDOWO
Printed 170A on the part. Easy to misread as L70A. Check that character with a loupe before you order anything.
What it is
TVS diode
Maker
DOWO
Package
SMA
Pins
2
Source
Manufacturer datasheet
Is it dead?
Diode range, from the protected line to ground, part lifted if you can.
Working, it reads
A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.
Dead, it reads
From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
A reading both ways on a one-way part: leaky.
A one-way part open both ways: failed open.
On the board
, a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
Compare:
The same part on the next line or connector pin is the healthy reading to compare with.
Watch for:
A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Datasheetfor P4SMA170A, opens in a new tab
P4SMAJ170Aprinted 170ASMATVS diode, 2 pins, Taitron ComponentsTVS diodeSMA2 pinsTaitron Components
Printed 170A on the part. Easy to misread as L70A. Check that character with a loupe before you order anything.
What it is
TVS diode
Maker
Taitron Components
Package
SMA
Pins
2
Details
SMD TVS - 400W
Source
Manufacturer datasheet
Is it dead?
Diode range, from the protected line to ground, part lifted if you can.
Working, it reads
A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.
Dead, it reads
From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
A reading both ways on a one-way part: leaky.
A one-way part open both ways: failed open.
On the board
, a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
Compare:
The same part on the next line or connector pin is the healthy reading to compare with.
Watch for:
A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Datasheetfor P4SMAJ170A, opens in a new tab
P6SMB170Aprinted 170ASMBTVS diode, 2 pins, DOWOTVS diodeSMB2 pinsDOWO
Printed 170A on the part. Easy to misread as L70A. Check that character with a loupe before you order anything.
What it is
TVS diode
Maker
DOWO
Package
SMB
Pins
2
Source
Manufacturer datasheet
Is it dead?
Diode range, from the protected line to ground, part lifted if you can.
Working, it reads
A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.
Dead, it reads
From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
A reading both ways on a one-way part: leaky.
A one-way part open both ways: failed open.
On the board
, a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
Compare:
The same part on the next line or connector pin is the healthy reading to compare with.
Watch for:
A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Datasheetfor P6SMB170A, opens in a new tab
P6SMB170A(MS)printed 170ASMBTVS diode, 2 pins, MSKSEMITVS diodeSMB2 pinsMSKSEMI
Printed 170A on the part. Easy to misread as L70A. Check that character with a loupe before you order anything.
What it is
TVS diode
Maker
MSKSEMI
Package
SMB
Pins
2
Source
Manufacturer datasheet
Is it dead?
Diode range, from the protected line to ground, part lifted if you can.
Working, it reads
A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.
Dead, it reads
From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
A reading both ways on a one-way part: leaky.
A one-way part open both ways: failed open.
On the board
, a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
Compare:
The same part on the next line or connector pin is the healthy reading to compare with.
Watch for:
A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Datasheetfor P6SMB170A(MS), opens in a new tab
P6SMBF170Aprinted 170ASMBFTVS diode, 2 pins, YFWTVS diodeSMBF2 pinsYFW
Printed 170A on the part. Easy to misread as L70A. Check that character with a loupe before you order anything.
What it is
TVS diode
Maker
YFW
Package
SMBF
Pins
2
Source
Manufacturer datasheet
Is it dead?
Diode range, from the protected line to ground, part lifted if you can.
Working, it reads
A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.
Dead, it reads
From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
A reading both ways on a one-way part: leaky.
A one-way part open both ways: failed open.
On the board
, a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
Compare:
The same part on the next line or connector pin is the healthy reading to compare with.
Watch for:
A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Datasheetfor P6SMBF170A, opens in a new tab
P6SMBJ170Aprinted 170ASMBTVS diode, 2 pins, Taitron ComponentsTVS diodeSMB2 pinsTaitron Components
Printed 170A on the part. Easy to misread as L70A. Check that character with a loupe before you order anything.
What it is
TVS diode
Maker
Taitron Components
Package
SMB
Pins
2
Details
SMD TVS - 600W
Source
Manufacturer datasheet
Is it dead?
Diode range, from the protected line to ground, part lifted if you can.
Working, it reads
A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.
Dead, it reads
From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
A reading both ways on a one-way part: leaky.
A one-way part open both ways: failed open.
On the board
, a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
Compare:
The same part on the next line or connector pin is the healthy reading to compare with.
Watch for:
A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Datasheetfor P6SMBJ170A, opens in a new tab
P15SMCJ170Aprinted 170ASMCFTVS diode, 2 pins, Formosa MicrosemiTVS diodeSMCF2 pinsFormosa Microsemi
Printed 170A on the part. Easy to misread as L70A. Check that character with a loupe before you order anything.
What it is
TVS diode
Maker
Formosa Microsemi
Package
SMCF
Pins
2
Source
Manufacturer datasheet
Is it dead?
Diode range, from the protected line to ground, part lifted if you can.
Working, it reads
A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.
Dead, it reads
From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
A reading both ways on a one-way part: leaky.
A one-way part open both ways: failed open.
On the board
, a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
Compare:
The same part on the next line or connector pin is the healthy reading to compare with.
Watch for:
A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Datasheetfor P15SMCJ170A, opens in a new tab
SFL2J170A-Cprinted 170ASOD-123FTVS diode, 2 pins, SeCoSTVS diodeSOD-123F2 pinsSeCoS
Printed 170A on the part. Easy to misread as L70A. Check that character with a loupe before you order anything.
What it is
TVS diode
Maker
SeCoS
Package
SOD-123F
Pins
2
Source
Manufacturer datasheet
Is it dead?
Diode range, from the protected line to ground, part lifted if you can.
Working, it reads
A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.
Dead, it reads
From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
A reading both ways on a one-way part: leaky.
A one-way part open both ways: failed open.
On the board
, a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
Compare:
The same part on the next line or connector pin is the healthy reading to compare with.
Watch for:
A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Datasheetfor SFL2J170A-C, opens in a new tab
SM4F170Aprinted 170ASOD-123FTVS diode, 2 pins, YFWTVS diodeSOD-123F2 pinsYFW
Printed 170A on the part. Easy to misread as L70A. Check that character with a loupe before you order anything.
What it is
TVS diode
Maker
YFW
Package
SOD-123F
Pins
2
Source
Manufacturer datasheet
Is it dead?
Diode range, from the protected line to ground, part lifted if you can.
Working, it reads
A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.
Dead, it reads
From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
A reading both ways on a one-way part: leaky.
A one-way part open both ways: failed open.
On the board
, a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
Compare:
The same part on the next line or connector pin is the healthy reading to compare with.
Watch for:
A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Datasheetfor SM4F170A, opens in a new tab
SMF170Aprinted 170ASOD-123FTVS diode, 2 pins, Good-ArkTVS diodeSOD-123F2 pinsGood-Ark
Printed 170A on the part. Easy to misread as L70A. Check that character with a loupe before you order anything.
What it is
TVS diode
Maker
Good-Ark
Package
SOD-123F
Pins
2
Source
Manufacturer datasheet
Is it dead?
Diode range, from the protected line to ground, part lifted if you can.
Working, it reads
A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.
Dead, it reads
From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
A reading both ways on a one-way part: leaky.
A one-way part open both ways: failed open.
On the board
, a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
Compare:
The same part on the next line or connector pin is the healthy reading to compare with.
Watch for:
A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Datasheetfor SMF170A, opens in a new tab
TP4SMA170Aprinted 170ASMATVS diode, 2 pins, Galaxy MicroelectronicsTVS diodeSMA2 pinsGalaxy Microelectronics
Printed 170A on the part. Easy to misread as L70A. Check that character with a loupe before you order anything.
What it is
TVS diode
Maker
Galaxy Microelectronics
Package
SMA
Pins
2
Details
170V, 400W, Surface Mount TVS
Source
Manufacturer datasheet
Is it dead?
Diode range, from the protected line to ground, part lifted if you can.
Working, it reads
A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.
Dead, it reads
From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
A reading both ways on a one-way part: leaky.
A one-way part open both ways: failed open.
On the board
, a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
Compare:
The same part on the next line or connector pin is the healthy reading to compare with.
Watch for:
A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Datasheetfor TP4SMA170A, opens in a new tab
P6SMB170A-E3/52printed 170ASMBTVS diode, 2 pins, HXYTVS diodeSMB2 pinsHXY
Printed 170A on the part. Easy to misread as L70A. Check that character with a loupe before you order anything.
What it is
TVS diode
Maker
HXY
Package
SMB
Pins
2
Source
Manufacturer datasheet
Is it dead?
Diode range, from the protected line to ground, part lifted if you can.
Working, it reads
A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.
Dead, it reads
From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
A reading both ways on a one-way part: leaky.
A one-way part open both ways: failed open.
On the board
, a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
Compare:
The same part on the next line or connector pin is the healthy reading to compare with.
Watch for:
A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Datasheetfor P6SMB170A-E3/52, opens in a new tab
P6SMB170A/TR13printed 170ASMBTVS diode, 2 pins, HXYTVS diodeSMB2 pinsHXY
Printed 170A on the part. Easy to misread as L70A. Check that character with a loupe before you order anything.
What it is
TVS diode
Maker
HXY
Package
SMB
Pins
2
Source
Manufacturer datasheet
Is it dead?
Diode range, from the protected line to ground, part lifted if you can.
Working, it reads
A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.
Dead, it reads
From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
A reading both ways on a one-way part: leaky.
A one-way part open both ways: failed open.
On the board
, a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
Compare:
The same part on the next line or connector pin is the healthy reading to compare with.
Watch for:
A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Datasheetfor P6SMB170A/TR13, opens in a new tab
1SMC170Aprinted 170ASMCTVS diode, 2 pins, EIC SemiconductorTVS diodeSMC2 pinsEIC Semiconductor
Printed 170A on the part. Easy to misread as L70A. Check that character with a loupe before you order anything.
What it is
TVS diode
Maker
EIC Semiconductor
Package
SMC
Pins
2
Details
TVS: 170V, 5.5A, 1500W(1ms)
Source
Published code list
Is it dead?
Diode range, from the protected line to ground, part lifted if you can.
Working, it reads
A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.
Dead, it reads
From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
A reading both ways on a one-way part: leaky.
A one-way part open both ways: failed open.
On the board
, a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
Compare:
The same part on the next line or connector pin is the healthy reading to compare with.
Watch for:
A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
3.0SMC170Aprinted 170ASMCTVS diode, 2 pins, Shanghai SemitechTVS diodeSMC2 pinsShanghai Semitech
Printed 170A on the part. Easy to misread as L70A. Check that character with a loupe before you order anything.
What it is
TVS diode
Maker
Shanghai Semitech
Package
SMC
Pins
2
Source
Published code list
Is it dead?
Diode range, from the protected line to ground, part lifted if you can.
Working, it reads
A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.
Dead, it reads
From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
A reading both ways on a one-way part: leaky.
A one-way part open both ways: failed open.
On the board
, a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
Compare:
The same part on the next line or connector pin is the healthy reading to compare with.
Watch for:
A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Datasheetfor 3.0SMC170A, opens in a new tab
LT1790BCS6-3printed LTQASOT-23-66 pins, Analog DevicesNot recordedSOT-23-66 pinsAnalog Devices
Printed LTQA on the part. Easy to misread as L70A. Check that character with a loupe before you order anything.
What it is
Not recorded
Maker
Analog Devices
Package
SOT-23-6
Pins
6
Source
Published code list
Is it dead?
Diode range and ohms range, part lifted.
Working, it reads
Depends on what it is. The datasheet, or an identical part, says.
Dead, it reads
Between two pins, the same reading both ways, near 0 V with a continuous beep: shorted.
Open between every pair of pins: failed open, or a part that reads open when working.
On the board
this is a first look only: the meter reads every path between those pins, and a short can be a neighbour. Lift one leg before you condemn it.
Compare:
If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
LTC1690CMS8printed LTDAMSOP-88 pins, Analog DevicesNot recordedMSOP-88 pinsAnalog Devices
Printed LTDA on the part. Easy to misread as L70A. Check that character with a loupe before you order anything.
What it is
Not recorded
Maker
Analog Devices
Package
MSOP-8
Pins
8
Details
equivalent LTC1690CN8
Source
Published code list
Is it dead?
Diode range and ohms range, part lifted.
Working, it reads
Depends on what it is. The datasheet, or an identical part, says.
Dead, it reads
Between two pins, the same reading both ways, near 0 V with a continuous beep: shorted.
Open between every pair of pins: failed open, or a part that reads open when working.
On the board
this is a first look only: the meter reads every path between those pins, and a short can be a neighbour. Lift one leg before you condemn it.
Compare:
If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
P4SMAFJ170Aprinted 170ASMAFTVS diode, 2 pins, Dongguan You Feng Wei ElectronicsTVS diodeSMAF2 pinsDongguan You Feng Wei Electronics
Printed 170A on the part. Easy to misread as L70A. Check that character with a loupe before you order anything.
What it is
TVS diode
Maker
Dongguan You Feng Wei Electronics
Package
SMAF
Pins
2
Details
TVS diode, unidirectional
Source
Published code list
Is it dead?
Diode range, from the protected line to ground, part lifted if you can.
Working, it reads
A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.
Dead, it reads
From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
A reading both ways on a one-way part: leaky.
A one-way part open both ways: failed open.
On the board
, a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
Compare:
The same part on the next line or connector pin is the healthy reading to compare with.
Watch for:
A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Datasheetfor P4SMAFJ170A, opens in a new tab
P4SMFJ170Aprinted 170ASOD-123FTVS diode, 2 pins, YeashinTVS diodeSOD-123F2 pinsYeashin
Printed 170A on the part. Easy to misread as L70A. Check that character with a loupe before you order anything.
What it is
TVS diode
Maker
Yeashin
Package
SOD-123F
Pins
2
Details
Transient voltage supressor: Vrwm=170V, Ipp=1.4A, 400W (1ms)
Source
Published code list
Is it dead?
Diode range, from the protected line to ground, part lifted if you can.
Working, it reads
A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.
Dead, it reads
From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
A reading both ways on a one-way part: leaky.
A one-way part open both ways: failed open.
On the board
, a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
Compare:
The same part on the next line or connector pin is the healthy reading to compare with.
Watch for:
A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
PSMAJ170Aprinted 170ASMATVS diode, 2 pins, Lite-On SemiconductorTVS diodeSMA2 pinsLite-On Semiconductor
Printed 170A on the part. Easy to misread as L70A. Check that character with a loupe before you order anything.
What it is
TVS diode
Maker
Lite-On Semiconductor
Package
SMA
Pins
2
Details
Transient voltage supressor: Vrwm=145.0V, Vbr=162.0..179.1V, Ipp=1.7A, 400W(1ms)
Source
Published code list
Is it dead?
Diode range, from the protected line to ground, part lifted if you can.
Working, it reads
A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.
Dead, it reads
From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
A reading both ways on a one-way part: leaky.
A one-way part open both ways: failed open.
On the board
, a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
Compare:
The same part on the next line or connector pin is the healthy reading to compare with.
Watch for:
A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
PSMBJ170Aprinted 170ASMBTVS diode, 2 pins, Lite-On SemiconductorTVS diodeSMB2 pinsLite-On Semiconductor
Printed 170A on the part. Easy to misread as L70A. Check that character with a loupe before you order anything.
What it is
TVS diode
Maker
Lite-On Semiconductor
Package
SMB
Pins
2
Details
Transient voltage supressor: Vrwm=145.0V, Vbr=162.0..179.1V, Ipp=2.6A, 600W(1ms)
Source
Published code list
Is it dead?
Diode range, from the protected line to ground, part lifted if you can.
Working, it reads
A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.
Dead, it reads
From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
A reading both ways on a one-way part: leaky.
A one-way part open both ways: failed open.
On the board
, a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
Compare:
The same part on the next line or connector pin is the healthy reading to compare with.
Watch for:
A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
PSMCJ170Aprinted 170ASMCTVS diode, 2 pins, Lite-On SemiconductorTVS diodeSMC2 pinsLite-On Semiconductor
Printed 170A on the part. Easy to misread as L70A. Check that character with a loupe before you order anything.
What it is
TVS diode
Maker
Lite-On Semiconductor
Package
SMC
Pins
2
Details
Transient voltage supressor: Vrwm=145.0V, Vbr=162.0..179.1V, Ipp=6.4A, 1500W(1ms)
Source
Published code list
Is it dead?
Diode range, from the protected line to ground, part lifted if you can.
Working, it reads
A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.
Dead, it reads
From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
A reading both ways on a one-way part: leaky.
A one-way part open both ways: failed open.
On the board
, a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
Compare:
The same part on the next line or connector pin is the healthy reading to compare with.
Watch for:
A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
SMAJ170Aprinted 170ASMATVS diode, 2 pins, SynSemiTVS diodeSMA2 pinsSynSemi
Printed 170A on the part. Easy to misread as L70A. Check that character with a loupe before you order anything.
What it is
TVS diode
Maker
SynSemi
Package
SMA
Pins
2
Source
Published code list
Is it dead?
Diode range, from the protected line to ground, part lifted if you can.
Working, it reads
A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.
Dead, it reads
From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
A reading both ways on a one-way part: leaky.
A one-way part open both ways: failed open.
On the board
, a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
Compare:
The same part on the next line or connector pin is the healthy reading to compare with.
Watch for:
A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Datasheetfor SMAJ170A, opens in a new tab
SMAJP4KE170Aprinted 170ASMATVS diode, 2 pins, Micro Commercial ComponentsTVS diodeSMA2 pinsMicro Commercial Components
Printed 170A on the part. Easy to misread as L70A. Check that character with a loupe before you order anything.
What it is
TVS diode
Maker
Micro Commercial Components
Package
SMA
Pins
2
Details
Transient voltage supressor: Vrwm=145V, Vbr=162.0..179.0V, Ipp=1.8A, 400W(1ms)
Source
Published code list
Is it dead?
Diode range, from the protected line to ground, part lifted if you can.
Working, it reads
A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.
Dead, it reads
From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
A reading both ways on a one-way part: leaky.
A one-way part open both ways: failed open.
On the board
, a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
Compare:
The same part on the next line or connector pin is the healthy reading to compare with.
Watch for:
A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
SMBG170Aprinted 170ASMBGTVS diode, 2 pins, Microsemi Integrated Products DivisionTVS diodeSMBG2 pinsMicrosemi Integrated Products Division
Printed 170A on the part. Easy to misread as L70A. Check that character with a loupe before you order anything.
What it is
TVS diode
Maker
Microsemi Integrated Products Division
Package
SMBG
Pins
2
Details
600 W TVS diode, unidirectional
Source
Published code list
Is it dead?
Diode range, from the protected line to ground, part lifted if you can.
Working, it reads
A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.
Dead, it reads
From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
A reading both ways on a one-way part: leaky.
A one-way part open both ways: failed open.
On the board
, a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
Compare:
The same part on the next line or connector pin is the healthy reading to compare with.
Watch for:
A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Datasheetfor SMBG170A, opens in a new tab
SMBJ170Aprinted 170ASMBTVS diode, 2 pins, SynSemiTVS diodeSMB2 pinsSynSemi
Printed 170A on the part. Easy to misread as L70A. Check that character with a loupe before you order anything.
What it is
TVS diode
Maker
SynSemi
Package
SMB
Pins
2
Source
Published code list
Is it dead?
Diode range, from the protected line to ground, part lifted if you can.
Working, it reads
A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.
Dead, it reads
From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
A reading both ways on a one-way part: leaky.
A one-way part open both ways: failed open.
On the board
, a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
Compare:
The same part on the next line or connector pin is the healthy reading to compare with.
Watch for:
A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Datasheetfor SMBJ170A, opens in a new tab
SMBJP6KE170Aprinted 170ASMBTVS diode, 2 pins, Micro Commercial ComponentsTVS diodeSMB2 pinsMicro Commercial Components
Printed 170A on the part. Easy to misread as L70A. Check that character with a loupe before you order anything.
What it is
TVS diode
Maker
Micro Commercial Components
Package
SMB
Pins
2
Details
Transient voltage supressor: Vrwm=145V, Vbr=162.0..179.0V, Ipp=2.6A, 600W(1ms)
Source
Published code list
Is it dead?
Diode range, from the protected line to ground, part lifted if you can.
Working, it reads
A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.
Dead, it reads
From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
A reading both ways on a one-way part: leaky.
A one-way part open both ways: failed open.
On the board
, a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
Compare:
The same part on the next line or connector pin is the healthy reading to compare with.
Watch for:
A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
SMCJ1.5KE170Aprinted 170ASMCTVS diode, 2 pins, Micro Commercial ComponentsTVS diodeSMC2 pinsMicro Commercial Components
Printed 170A on the part. Easy to misread as L70A. Check that character with a loupe before you order anything.
What it is
TVS diode
Maker
Micro Commercial Components
Package
SMC
Pins
2
Details
Transient voltage supressor: Vrwm=145V, Vbr=162.0..179.0V, Ipp=6.5A, 1500W(1ms)
Source
Published code list
Is it dead?
Diode range, from the protected line to ground, part lifted if you can.
Working, it reads
A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.
Dead, it reads
From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
A reading both ways on a one-way part: leaky.
A one-way part open both ways: failed open.
On the board
, a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
Compare:
The same part on the next line or connector pin is the healthy reading to compare with.
Watch for:
A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
SMCJ170Aprinted 170ASMCTVS diode, 2 pins, SynSemiTVS diodeSMC2 pinsSynSemi
Printed 170A on the part. Easy to misread as L70A. Check that character with a loupe before you order anything.
What it is
TVS diode
Maker
SynSemi
Package
SMC
Pins
2
Source
Published code list
Is it dead?
Diode range, from the protected line to ground, part lifted if you can.
Working, it reads
A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.
Dead, it reads
From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
A reading both ways on a one-way part: leaky.
A one-way part open both ways: failed open.
On the board
, a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
Compare:
The same part on the next line or connector pin is the healthy reading to compare with.
Watch for:
A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Datasheetfor SMCJ170A, opens in a new tab
SMLG7.0Aprinted L7.0ASMCGTVS diode, 2 pins, Microsemi Integrated Products DivisionTVS diodeSMCG2 pinsMicrosemi Integrated Products Division
Printed L7.0A on the part. Easy to misread as L70A. Check that character with a loupe before you order anything.
What it is
TVS diode
Maker
Microsemi Integrated Products Division
Package
SMCG
Pins
2
Details
Transient voltage supressor: Vrwm=7.0V, Vbr=7.78..8.60V, Ipp=250.0A, 3000W(1ms)
Source
Published code list
Is it dead?
Diode range, from the protected line to ground, part lifted if you can.
Working, it reads
A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.
Dead, it reads
From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
A reading both ways on a one-way part: leaky.
A one-way part open both ways: failed open.
On the board
, a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
Compare:
The same part on the next line or connector pin is the healthy reading to compare with.
Watch for:
A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
SMLJ7.0Aprinted L7.0ASMCTVS diode, 2 pins, Microsemi Integrated Products DivisionTVS diodeSMC2 pinsMicrosemi Integrated Products Division
Printed L7.0A on the part. Easy to misread as L70A. Check that character with a loupe before you order anything.
What it is
TVS diode
Maker
Microsemi Integrated Products Division
Package
SMC
Pins
2
Details
TVS: 7.0V, 250.0A, 3000W(1ms)
Source
Published code list
Is it dead?
Diode range, from the protected line to ground, part lifted if you can.
Working, it reads
A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.
Dead, it reads
From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
A reading both ways on a one-way part: leaky.
A one-way part open both ways: failed open.
On the board
, a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
Compare:
The same part on the next line or connector pin is the healthy reading to compare with.
Watch for:
A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
TPSMB170Aprinted 170ASMBTVS diode, 2 pins, LittelfuseTVS diodeSMB2 pinsLittelfuse
Printed 170A on the part. Easy to misread as L70A. Check that character with a loupe before you order anything.
What it is
TVS diode
Maker
Littelfuse
Package
SMB
Pins
2
Source
Published code list
Is it dead?
Diode range, from the protected line to ground, part lifted if you can.
Working, it reads
A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.
Dead, it reads
From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
A reading both ways on a one-way part: leaky.
A one-way part open both ways: failed open.
On the board
, a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
Compare:
The same part on the next line or connector pin is the healthy reading to compare with.
Watch for:
A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Datasheetfor TPSMB170A, opens in a new tab
TV15CJ171A-Gprinted 170ASMCTVS diode, 2 pins, ComchipTVS diodeSMC2 pinsComchip
Printed 170A on the part. Easy to misread as L70A. Check that character with a loupe before you order anything.
What it is
TVS diode
Maker
Comchip
Package
SMC
Pins
2
Details
Transient voltage supressor: Vbr=161.5..178.5V, Vrwm=145.0V, Ipp=6.41A, 1500W(1ms)
Source
Published code list
Is it dead?
Diode range, from the protected line to ground, part lifted if you can.
Working, it reads
A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.
Dead, it reads
From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
A reading both ways on a one-way part: leaky.
A one-way part open both ways: failed open.
On the board
, a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
Compare:
The same part on the next line or connector pin is the healthy reading to compare with.
Watch for:
A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
TVP04A171A-Gprinted 170ASMATVS diode, 2 pins, ComchipTVS diodeSMA2 pinsComchip
Printed 170A on the part. Easy to misread as L70A. Check that character with a loupe before you order anything.
What it is
TVS diode
Maker
Comchip
Package
SMA
Pins
2
Details
Transient voltage supressor: Vbr=161.50..178.50V, Vrwm=145V, Ipp=1.71A, 400W(1ms)
Source
Published code list
Is it dead?
Diode range, from the protected line to ground, part lifted if you can.
Working, it reads
A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.
Dead, it reads
From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
A reading both ways on a one-way part: leaky.
A one-way part open both ways: failed open.
On the board
, a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
Compare:
The same part on the next line or connector pin is the healthy reading to compare with.
Watch for:
A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
TVP06B171A-Gprinted 170ASMBTVS diode, 2 pins, ComchipTVS diodeSMB2 pinsComchip
Printed 170A on the part. Easy to misread as L70A. Check that character with a loupe before you order anything.
What it is
TVS diode
Maker
Comchip
Package
SMB
Pins
2
Details
Transient voltage supressor: Vrwm=145V, Vbr=161.50..178.50V, Ipp=2.56A, 600W(1ms)
Source
Published code list
Is it dead?
Diode range, from the protected line to ground, part lifted if you can.
Working, it reads
A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.
Dead, it reads
From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
A reading both ways on a one-way part: leaky.
A one-way part open both ways: failed open.
On the board
, a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
Compare:
The same part on the next line or connector pin is the healthy reading to compare with.
Watch for:
A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
4 more parts have no package on record
- 1.5SMCJ170Aprinted 170ATVS diode, Taitron ComponentsTVS diodeNot recordedNot recordedTaitron Components
  Printed 170A on the part. Easy to misread as L70A. Check that character with a loupe before you order anything.
  What it is
  TVS diode
  Maker
  Taitron Components
  Package
  Not recorded
  Pins
  Not recorded
  Details
  SMD TVS - 1500W
  Source
  Manufacturer datasheet
  Is it dead?
  Diode range, from the protected line to ground, part lifted if you can.
  Working, it reads
  A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.
  Dead, it reads
  From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
  A reading both ways on a one-way part: leaky.
  A one-way part open both ways: failed open.
  On the board
  , a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
  Compare:
  The same part on the next line or connector pin is the healthy reading to compare with.
  Watch for:
  A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.
  A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
  Datasheetfor 1.5SMCJ170A, opens in a new tab
- P4SMASF170Aprinted 170ATVS diode, Formosa MicrosemiTVS diodeNot recordedNot recordedFormosa Microsemi
  Printed 170A on the part. Easy to misread as L70A. Check that character with a loupe before you order anything.
  What it is
  TVS diode
  Maker
  Formosa Microsemi
  Package
  Not recorded
  Pins
  Not recorded
  Source
  Manufacturer datasheet
  Is it dead?
  Diode range, from the protected line to ground, part lifted if you can.
  Working, it reads
  A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.
  Dead, it reads
  From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
  A reading both ways on a one-way part: leaky.
  A one-way part open both ways: failed open.
  On the board
  , a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
  Compare:
  The same part on the next line or connector pin is the healthy reading to compare with.
  Watch for:
  A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.
  A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
  Datasheetfor P4SMASF170A, opens in a new tab
- 3PMT170Aprinted 170ATVS diode, Microsemi Integrated Products DivisionTVS diodeNot recordedNot recordedMicrosemi Integrated Products Division
  Printed 170A on the part. Easy to misread as L70A. Check that character with a loupe before you order anything.
  What it is
  TVS diode
  Maker
  Microsemi Integrated Products Division
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Transient voltage supressor: Vvm=170V, Vbr=189V, Vcl=275V, 5.5A, 1500W(1ms)
  Source
  Published code list
  Is it dead?
  Diode range, from the protected line to ground, part lifted if you can.
  Working, it reads
  A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.
  Dead, it reads
  From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
  A reading both ways on a one-way part: leaky.
  A one-way part open both ways: failed open.
  On the board
  , a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
  Compare:
  The same part on the next line or connector pin is the healthy reading to compare with.
  Watch for:
  A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.
  A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
- UMA170Aprinted 170ATVS diode, Microsemi Integrated Products DivisionTVS diodeNot recordedNot recordedMicrosemi Integrated Products Division
  Printed 170A on the part. Easy to misread as L70A. Check that character with a loupe before you order anything.
  What it is
  TVS diode
  Maker
  Microsemi Integrated Products Division
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Transient voltage supressor: Vrwm=170V, Vbr=189..275V, 1.8A, 500W(1ms)
  Source
  Published code list
  Is it dead?
  Diode range, from the protected line to ground, part lifted if you can.
  Working, it reads
  A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.
  Dead, it reads
  From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
  A reading both ways on a one-way part: leaky.
  A one-way part open both ways: failed open.
  On the board
  , a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
  Compare:
  The same part on the next line or connector pin is the healthy reading to compare with.
  Watch for:
  A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.
  A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

14 more parts have codes that begin with L70A

Codes that begin with L70A

For a marking with its end worn or burnt off. Each one shows its full printed code.

Voltage supervisor. What differs:

BL8509-170ACRMprinted 170ACSOT-233 pins, Shanghai BellingSOT-233 pinsShanghai Belling
Printed 170AC. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
What it is
Voltage supervisor
Maker
Shanghai Belling
Package
SOT-23
Pins
3
Details
Voltage detector IC: 1.7V±2%, -Reset PPO, Rdt=50ms
Source
Published code list
Is it dead?
Voltage with the board powered; ohms from each pin to ground with it off.
Working, it reads
Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.
Dead, it reads
A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
Supply present, output stuck: failed, or its load has.
On the board:
A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
Compare:
The surest reference is the same IC on a working board, measured pin by pin.
Watch for:
Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
BL8509-170ACRNprinted 170ACSOT-23-55 pins, Shanghai BellingSOT-23-55 pinsShanghai Belling
Printed 170AC. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
What it is
Voltage supervisor
Maker
Shanghai Belling
Package
SOT-23-5
Pins
5
Details
Voltage detector IC: 1.7V±2%, -Reset PPO, Rdt=50ms
Source
Published code list
Is it dead?
Voltage with the board powered; ohms from each pin to ground with it off.
Working, it reads
Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.
Dead, it reads
A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
Supply present, output stuck: failed, or its load has.
On the board:
A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
Compare:
The surest reference is the same IC on a working board, measured pin by pin.
Watch for:
Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
BL8509-170ANRMprinted 170ANSOT-233 pins, Shanghai BellingSOT-233 pinsShanghai Belling
Printed 170AN. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
What it is
Voltage supervisor
Maker
Shanghai Belling
Package
SOT-23
Pins
3
Details
Voltage detector IC: 1.7V±2%, -Reset ODO, Rdt=50ms
Source
Published code list
Is it dead?
Voltage with the board powered; ohms from each pin to ground with it off.
Working, it reads
Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.
Dead, it reads
A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
Supply present, output stuck: failed, or its load has.
On the board:
A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
Compare:
The surest reference is the same IC on a working board, measured pin by pin.
Watch for:
Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
BL8509-170ANRNprinted 170ANSOT-23-55 pins, Shanghai BellingSOT-23-55 pinsShanghai Belling
Printed 170AN. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
What it is
Voltage supervisor
Maker
Shanghai Belling
Package
SOT-23-5
Pins
5
Details
Voltage detector IC: 1.7V±2%, -Reset ODO, Rdt=50ms
Source
Published code list
Is it dead?
Voltage with the board powered; ohms from each pin to ground with it off.
Working, it reads
Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.
Dead, it reads
A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
Supply present, output stuck: failed, or its load has.
On the board:
A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
Compare:
The surest reference is the same IC on a working board, measured pin by pin.
Watch for:
Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
GM8509B-170ACRMprinted 170ACSOT-233 pins, Hangzhou Jiemao MicroelectronicsSOT-233 pinsHangzhou Jiemao Microelectronics
Printed 170AC. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
What it is
Voltage supervisor
Maker
Hangzhou Jiemao Microelectronics
Package
SOT-23
Pins
3
Details
Voltage detector IC: 1.7V±2%, -Reset PPO, Rdt=50ms
Source
Published code list
Is it dead?
Voltage with the board powered; ohms from each pin to ground with it off.
Working, it reads
Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.
Dead, it reads
A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
Supply present, output stuck: failed, or its load has.
On the board:
A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
Compare:
The surest reference is the same IC on a working board, measured pin by pin.
Watch for:
Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

9 more parts are not listed here. Type more of the code to narrow the list.

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One code, several parts

Marking codes are not unique. In the standard code book, 6H on a SOT-23 is an NPN transistor, a varicap, an N-channel JFET, two digital transistors, a 3.6 V voltage detector: six parts from five makers. So a search on WhatSMD (What SMD) shows the parts we hold under that code and under codes easily misread as it, with only the columns that tell them apart.

6Hon a SOT-23, in the code book

NPN transistor
Varicap
N-channel JFET
Digital transistor ×2
3.6 V voltage detector

When more than one is left

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What’s printed on it?

3 parts are printed L70A

Is it dead?

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Printed with a code easy to misread

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Codes that begin with L70A

Is it dead?

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One code, several parts

When more than one is left

When you cannot read it

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