SMD code S34
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.
38 parts are printed S34
Not sure which one you have?
Answer up to 4 quick questions and these 38 parts are ranked, with a meter test that settles it. It works on a dead part too.
DS34WSOD-123FSchottky diode, 2 pins, Blue RocketSchottky diodeSOD-123F2 pinsBlue Rocket
- What it is
- Schottky diode
- Maker
- Blue Rocket
- Package
- SOD-123F
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
S-SM340ASMASchottky diode, 2 pins, LRCSchottky diodeSMA2 pinsLRC
- What it is
- Schottky diode
- Maker
- LRC
- Package
- SMA
- Pins
- 2
- Details
- Schottky diode, VR 40 V, IF 3 A, VF Max 0.55 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
S-SM340AFSMAFSchottky diode, 2 pins, LRCSchottky diodeSMAF2 pinsLRC
- What it is
- Schottky diode
- Maker
- LRC
- Package
- SMAF
- Pins
- 2
- Details
- Schottky diode, VR 40 V, IF 3 A, VF Max 0.55 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
S-SM340BSMBSchottky diode, 2 pins, LRCSchottky diodeSMB2 pinsLRC
- What it is
- Schottky diode
- Maker
- LRC
- Package
- SMB
- Pins
- 2
- Details
- Schottky diode, VR 40 V, IF 3 A, VF Max 0.55 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
S-SS340AFSMAFSchottky diode, 2 pins, LRCSchottky diodeSMAF2 pinsLRC
- What it is
- Schottky diode
- Maker
- LRC
- Package
- SMAF
- Pins
- 2
- Details
- Schottky diode, VR 40 V, IF 3 A, VF Max 0.55 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
SFM34SMCRectifier, 2 pins, Formosa MicrosemiRectifierSMC2 pinsFormosa Microsemi
- What it is
- Rectifier
- Maker
- Formosa Microsemi
- Package
- SMC
- Pins
- 2
- Details
- Rectifier diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
SFM34-Q1SMCRectifier, 2 pins, Formosa MicrosemiRectifierSMC2 pinsFormosa Microsemi
- What it is
- Rectifier
- Maker
- Formosa Microsemi
- Package
- SMC
- Pins
- 2
- Details
- Rectifier diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
8 more parts have no package on record
CSM340ASchottky diode, LRCSchottky diodeNot recordedNot recordedLRC
- What it is
- Schottky diode
- Maker
- LRC
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Schottky diode, VR 40 V, IF 3 A, VF Max 0.55 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
CSM340BSchottky diode, LRCSchottky diodeNot recordedNot recordedLRC
- What it is
- Schottky diode
- Maker
- LRC
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Schottky diode, VR 40 V, IF 3 A, VF Max 0.55 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
S-CSM340ASchottky diode, LRCSchottky diodeNot recordedNot recordedLRC
- What it is
- Schottky diode
- Maker
- LRC
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Schottky diode, VR 40 V, IF 3 A, VF Max 0.55 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
S-CSM340BSchottky diode, LRCSchottky diodeNot recordedNot recordedLRC
- What it is
- Schottky diode
- Maker
- LRC
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Schottky diode, VR 40 V, IF 3 A, VF Max 0.55 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
SFM34-BSRectifier, Formosa MicrosemiRectifierNot recordedNot recordedFormosa Microsemi
- What it is
- Rectifier
- Maker
- Formosa Microsemi
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Rectifier diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
SFM34-BS-Q1Rectifier, Formosa MicrosemiRectifierNot recordedNot recordedFormosa Microsemi
- What it is
- Rectifier
- Maker
- Formosa Microsemi
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Rectifier diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
SK14JD-CSchottky diode, SeCoSSchottky diodeNot recordedNot recordedSeCoS
- What it is
- Schottky diode
- Maker
- SeCoS
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
SM320JDSchottky diode, SeCoSSchottky diodeNot recordedNot recordedSeCoS
- What it is
- Schottky diode
- Maker
- SeCoS
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky 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.
Schottky diode
Diode range, part lifted or one leg off the pad. Red probe on the anode.
Working, it reads
About 0.15 to 0.45 V anode to cathode, roughly half a silicon diode, and open the other way.
Dead, it reads
- The same reading both ways round, near 0 V with a continuous beep or the same middling value: shorted.
- A reading the wrong way round as well: leaky.
- Open both ways: failed open.
- 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 large Schottky can read about 0.1 V forward and beep like a short, and leaks a little the wrong way when good, more when warm. It is shorted only if it reads the same both ways. Measure it cold, beside an identical cold one.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Silicon diode
Diode range, part lifted or one leg off the pad. Red probe on the anode.
Working, it reads
About 0.5 to 0.8 V anode to cathode, and open the other way. Small switching diodes read about 0.6 to 0.7 V; large rectifiers can read a little lower.
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: failed open.
- A reading the wrong way round as well: 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 three-pin body can hold two diodes. With a common pin they read two junctions from that pin, just like a transistor; in series they read two drops end to end. Test each pair the datasheet names.
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 S34
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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