SMD code 18A in SMB
Marking codes are not standardised, and the same code is reused by unrelated makers for unrelated parts. Below is every part in our tables printed with it, and any printed with a code that is easy to misread as it, from the manufacturers' own marking tables and published code lists.
11 parts in SMB are printed 18A
Not sure which one you have?
Answer up to 4 quick questions and these 20 parts are ranked, with a meter test that settles it. It works on a dead part too.
3.0SMBJ18A-HFSMBTVS diode, 2 pins, ComchipTVS diode2 pinsComchip
- What it is
- TVS diode
- Maker
- Comchip
- Package
- SMB
- Pins
- 2
- Details
- 18 V 3000 W bidirectional TVS diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
A3.0SMBJ18A-HFSMBTVS diode, 2 pins, ComchipTVS diode2 pinsComchip
- What it is
- TVS diode
- Maker
- Comchip
- Package
- SMB
- Pins
- 2
- Details
- 18 V 3000 W unidirectional TVS diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
P6SMB18ASMBTVS diode, 2 pins, DOWOTVS diode2 pinsDOWO
- What it is
- TVS diode
- Maker
- DOWO
- Package
- SMB
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
P6SMB18A(MS)SMBTVS diode, 2 pins, MSKSEMITVS diode2 pinsMSKSEMI
- What it is
- TVS diode
- Maker
- MSKSEMI
- Package
- SMB
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
P6SMBJ18ASMBTVS diode, 2 pins, Taitron ComponentsTVS diode2 pinsTaitron Components
- What it is
- TVS diode
- Maker
- Taitron Components
- Package
- SMB
- Pins
- 2
- Details
- SMD TVS - 600W
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
PAM30DOAA18ASMBTVS diode, 2 pins, ProTek DevicesTVS diode2 pinsProTek Devices
- What it is
- TVS diode
- Maker
- ProTek Devices
- Package
- SMB
- Pins
- 2
- Details
- 600 Watt TVS Component
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
SMB15J18A-HFSMBTVS diode, 2 pins, ComchipTVS diode2 pinsComchip
- What it is
- TVS diode
- Maker
- Comchip
- Package
- SMB
- Pins
- 2
- Details
- 18 V 1500 W unidirectional TVS diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
SMBJ18ASMBTVS diode, 2 pins, YFWTVS diode2 pinsYFW
- What it is
- TVS diode
- Maker
- YFW
- Package
- SMB
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
PSMBJ18ASMBTVS diode, 2 pins, Lite-On SemiconductorTVS diode2 pinsLite-On Semiconductor
- What it is
- TVS diode
- Maker
- Lite-On Semiconductor
- Package
- SMB
- Pins
- 2
- Details
- Transient voltage supressor: Vrwm=15.3V, Vbr=17.1..18.9V, Ipp=23.8A, 600W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
SMBJP6KE18ASMBTVS diode, 2 pins, Micro Commercial ComponentsTVS diode2 pinsMicro Commercial Components
- What it is
- TVS diode
- Maker
- Micro Commercial Components
- Package
- SMB
- Pins
- 2
- Details
- Transient voltage supressor: Vrwm=15.30V, Vbr=17.10..18.90V, Ipp=24.2A, 600W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
TVP06B18A-GSMBTVS diode, 2 pins, ComchipTVS diode2 pinsComchip
- What it is
- TVS diode
- Maker
- Comchip
- Package
- SMB
- Pins
- 2
- Details
- Transient voltage supressor: Vrwm=15.3V, Vbr=17.10..18.90V, Ipp=23.81A, 600W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
4 more parts have no package on record. Nothing rules them out, so they stay.
1.5SMCJ18ATVS diode, Taitron ComponentsTVS diodeNot recordedTaitron Components
- What it is
- TVS diode
- Maker
- Taitron Components
- Package
- Not recorded
- Pins
- Not recorded
- Details
- SMD TVS - 1500W
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
P4SMASF18ATVS diode, Formosa MicrosemiTVS diodeNot recordedFormosa Microsemi
- What it is
- TVS diode
- Maker
- Formosa Microsemi
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
PLZ18AZener diode, VishayZener diodeNot recordedVishay
- What it is
- Zener diode
- Maker
- Vishay
- Package
- Not recorded
- Pins
- Not recorded
- Details
- 18 V Zener diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
3PMT18ATVS diode, Microsemi Integrated Products DivisionTVS diodeNot recordedMicrosemi Integrated Products Division
- What it is
- TVS diode
- Maker
- Microsemi Integrated Products Division
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Transient voltage supressor: Vvm=18V, Vbr=20.0V, Vcl=29.2V, 51.4A, 1500W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
Is it dead? One meter test per kind
Parts of the same kind are tested the same way, so each test is here once. Each part above points to its own.
TVS or ESD protection diode
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.
Zener diode
Diode range for the forward check, part lifted, red probe on the anode. A bench supply for the Zener voltage.
Working, it reads
About 0.6 to 0.8 V forward and open in reverse on the diode range. Its Zener voltage shows only on a supply: feed it through a resistor that sets about 5 mA, cathode to positive, read quickly, and it should hold near its rated voltage.
Dead, it reads
- The same reading both ways round, near 0 V with a continuous beep or the same middling value: shorted.
- Open both ways, forward too: failed open.
- Holds well off its rated voltage on the supply test: drifted.
- A soft knee, or a voltage that creeps on the supply test: leaky.
- 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.
- Watch for:
- A meter's diode range stops at about 2 to 3 V, so almost every Zener reads open in reverse on it, good or bad; a 3 V meter may just show a 2.4 or 2.7 V part. Above about 3 V the meter cannot tell a Zener from a plain diode.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Printed with a code easy to misread as 18A
One character differs, and it is one that is easy to confuse under a lamp. Each code has a page of its own.
Codes that begin with 18A
For a marking with its end worn or burnt off. Each code has a page of its own.
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