SMD code IV in SOD-123F
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.
4 parts in SOD-123F are printed IV
Not sure which one you have?
Answer up to 4 quick questions and these 10 parts are ranked, with a meter test that settles it. It works on a dead part too.
PTVSHC1RF20VBSOD-123FTVS diode, 2 pins, PrisemiTVS diode2 pinsPrisemi
- What it is
- TVS diode
- Maker
- Prisemi
- Package
- SOD-123F
- Pins
- 2
- Details
- TVS diode, 20 V working, bidirectional
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
SDFL20A-CSOD-123FTVS diode, 2 pins, SeCoSTVS diode2 pinsSeCoS
- What it is
- TVS diode
- Maker
- SeCoS
- Package
- SOD-123F
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
SMF20ASOD-123FTVS diode, 2 pins, Taitron ComponentsTVS diode2 pinsTaitron Components
- What it is
- TVS diode
- Maker
- Taitron Components
- Package
- SOD-123F
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
P2SMLJ20A-ASOD-123FTVS diode, 2 pins, YeashinTVS diode2 pinsYeashin
- What it is
- TVS diode
- Maker
- Yeashin
- Package
- SOD-123F
- Pins
- 2
- Details
- Transient voltage supressor: Vrwm=20.0V, Vbr=22.20..24.50V, Ipp=6.2A, 200W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
6 more parts have no package on record. Nothing rules them out, so they stay.
SM4F20A-ATTVS diode, WayonTVS diodeNot recordedWayon
- What it is
- TVS diode
- Maker
- Wayon
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
SMF20A-ATTVS diode, WayonTVS diodeNot recordedWayon
- What it is
- TVS diode
- Maker
- Wayon
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
TESDA13VU1052Q3ESD protection diode, Taiwan SemiconductorESD protection diodeNot recordedTaiwan Semiconductor
- What it is
- ESD protection diode
- Maker
- Taiwan Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
LT4ME20ATVS diode, Lite-On SemiconductorTVS diodeNot recordedLite-On Semiconductor
- What it is
- TVS diode
- Maker
- Lite-On Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Transient voltage supressor: Vrwm=20V, Vbr=22.2..24.5V, Ipp=12.3A, 400W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
P2SMSJ20ATVS diode, YeashinTVS diodeNot recordedYeashin
- What it is
- TVS diode
- Maker
- Yeashin
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Transient voltage supressor: Vrwm=20V, Vbr=22.2..24.5V, Ipp=6.2A, 200W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
SMF4L20AQTVS diode, Diodes IncorporatedTVS diodeNot recordedDiodes Incorporated
- What it is
- TVS diode
- Maker
- Diodes Incorporated
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Transient voltage supressor: Vrwm=20V, Vbr=22.2..24.5V, Ipp=12.3A, 400W(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.
Printed with a code easy to misread as IV
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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