SMD code TM in SMA
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.
14 parts in SMA are printed TM
Not sure which one you have?
Answer up to 4 quick questions and these 34 parts are ranked, with a meter test that settles it. It works on a dead part too.
824500442SMATVS diode, 2 pins, Würth ElektronikTVS diode2 pinsWürth Elektronik
- What it is
- TVS diode
- Maker
- Würth Elektronik
- Package
- SMA
- Pins
- 2
- Details
- WE-TVSP Power TVS Diode SMAJ440A
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
ASMAJ440A-HFSMATVS diode, 2 pins, ComchipTVS diode2 pinsComchip
- What it is
- TVS diode
- Maker
- Comchip
- Package
- SMA
- Pins
- 2
- Details
- 440 V 400 W unidirectional TVS diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
SMAJ7.0CASMATVS diode, 2 pins, JieJieTVS diode2 pinsJieJie
- What it is
- TVS diode
- Maker
- JieJie
- Package
- SMA
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
SMAJ440ASMATVS diode, 2 pins, Good-ArkTVS diode2 pinsGood-Ark
- What it is
- TVS diode
- Maker
- Good-Ark
- Package
- SMA
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
SMAJ440A-HFSMATVS diode, 2 pins, ComchipTVS diode2 pinsComchip
- What it is
- TVS diode
- Maker
- Comchip
- Package
- SMA
- Pins
- 2
- Details
- 440 V 400 W unidirectional TVS diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
SMAJ440A-SSMATVS diode, 2 pins, ProTek DevicesTVS diode2 pinsProTek Devices
- What it is
- TVS diode
- Maker
- ProTek Devices
- Package
- SMA
- Pins
- 2
- Details
- 400 Watt TVS Component
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
PSMAJ440A-13SMATVS diode, 2 pins, HXYTVS diode2 pinsHXY
- What it is
- TVS diode
- Maker
- HXY
- Package
- SMA
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
SMAJ440A/TR13SMATVS diode, 2 pins, HXYTVS diode2 pinsHXY
- What it is
- TVS diode
- Maker
- HXY
- Package
- SMA
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
CD214A-T7.0CASMATVS diode, 2 pins, BournsTVS diode2 pinsBourns
- What it is
- TVS diode
- Maker
- Bourns
- Package
- SMA
- Pins
- 2
- Details
- TVS: 7.0V, 33.3A, 400W(1ms), Bidirectional
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
EC76SMAJ440ASMATVS diode, 2 pins, E-CMOSTVS diode2 pinsE-CMOS
- What it is
- TVS diode
- Maker
- E-CMOS
- Package
- SMA
- Pins
- 2
- Details
- Transient voltage supressor: Vbr=492..543V, Vrwm=440V, Ipp=0.6A, 400W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
P4SMAJ7.0ACSMA2 pins, PanjitNot recorded2 pinsPanjit
- What it is
- Not recorded
- Maker
- Panjit
- Package
- SMA
- Pins
- 2
- Details
- TVS: 7V, 33.3A, 400W (1ms), Bidirectional
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
P4SMAJ7.0CASMA2 pins, PanjitNot recorded2 pinsPanjit
- What it is
- Not recorded
- Maker
- Panjit
- Package
- SMA
- Pins
- 2
- Details
- TVS: 7.0V, 33.3A, 400W(1ms), Bidirectional
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
P4SMAJ440ASMA2 pins, Micro Commercial ComponentsNot recorded2 pinsMicro Commercial Components
- What it is
- Not recorded
- Maker
- Micro Commercial Components
- Package
- SMA
- Pins
- 2
- Details
- TVS: 440V, 0.6A, 400W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
SMAJ7.0CAGSMATVS diode, 2 pins, First SemiconductorTVS diode2 pinsFirst Semiconductor
- What it is
- TVS diode
- Maker
- First Semiconductor
- Package
- SMA
- Pins
- 2
- Details
- Transient voltage supressor: Vrwm=7.0V, Vbr=7.78..8.95V, Ipp=33.3A, 400W(1ms), Bidir.
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
1 more part has no package on record. Nothing rules it out, so it stays.
NTE4151PP-channel MOSFET, onsemiP-channel MOSFETNot recordedonsemi
- What it is
- P-channel MOSFET
- Maker
- onsemi
- Package
- Not recorded
- Pins
- Not recorded
- Details
- MOSFET - Single, - P Channel, Small Signal, - - Gate Zener, SC 75, SC 89
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: P-channel MOSFET.
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.
P-channel MOSFET
Diode range, part lifted. Test drain to source first, then short gate to source and test again.
Working, it reads
Red probe on the drain, black on the source: about 0.4 to 0.9 V, the body diode. Open the other way. The gate reads open to both other pins, both ways.
Dead, it reads
- Drain to source the same both ways, near 0 V with a continuous beep, and still so after shorting gate to source: shorted. The classic failure.
- The gate reads low to source or drain: gate shorted. Often all three pins end up shorted together.
- No body diode at all: failed open.
- On the board
- the gate usually has a resistor to the source, so gate to source reads that resistor, which is not a fault. Lift a leg to be sure.
- 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 diode range can charge the gate enough to turn the part on, and then drain to source reads near 0 both ways on a good part. Short gate to source and test again before you condemn it.
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 TM
One character differs, and it is one that is easy to confuse under a lamp. Each code has a page of its own.
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