SMD code S34B
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.
7 parts are printed S34B
Not sure which one you have?
Answer up to 4 quick questions and these 7 parts are ranked, with a meter test that settles it. It works on a dead part too.
GSK34BSMBSchottky diode, 2 pins, Good-ArkSchottky diodeSMB2 pinsGood-Ark
- What it is
- Schottky diode
- Maker
- Good-Ark
- Package
- SMB
- Pins
- 2
- Details
- Schottky diode, 40 V, 3 A
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
SS34BFSMBFSchottky diode, 2 pins, YFWSchottky diodeSMBF2 pinsYFW
- What it is
- Schottky diode
- Maker
- YFW
- Package
- SMBF
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
SS34BF-HFSMBFSchottky diode, 2 pins, ComchipSchottky diodeSMBF2 pinsComchip
- What it is
- Schottky diode
- Maker
- Comchip
- Package
- SMBF
- Pins
- 2
- Details
- 40 V, 3 A Schottky barrier diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
4 more parts have no package on record
FM340BFSchottky diode, RectronSchottky diodeNot recordedNot recordedRectron
- What it is
- Schottky diode
- Maker
- Rectron
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
SM320BMSchottky 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.
SM340BMSchottky 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.
R1511S034BLDO regulator, RicohLDO regulatorNot recordedNot recordedRicoh
- What it is
- LDO regulator
- Maker
- Ricoh
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Linear voltage regulator IC: LDO, 3.4V±1%, 300mA, +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
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.
Voltage regulator
Voltage, board powered, black probe on ground. Then ohms with the power off.
Working, it reads
Input pin at the supply, output pin at its rated voltage, and the enable pin high if it has one.
Dead, it reads
- Output equal to the input: the pass element has shorted. Everything after it may have taken the full input.
- Input present, enable high, no output: failed open, or holding itself off into a shorted load. Power off and measure output to ground.
- Power off, input to output near 0 Ω: shorted.
- On the board:
- An output at 0 V is often a shorted load with the regulator in current limit. Lift the output pin: if the short stays on the board, the regulator may be fine.
- Compare:
- The same regulator on another rail or another board shows the right voltages and the right resistances.
- Watch for:
- Makers put input, output and ground on different pins in the same package, so take them from this part's datasheet. Diode or ohms readings between its pins say little; check it powered.
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 S34B
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 S34B
For a marking with its end worn or burnt off. Each code has a page of its own.
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