SMD code 34-
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.
83 parts are printed 34-
Not sure which one you have?
Answer up to 4 quick questions and these 50 parts are ranked, with a meter test that settles it. It works on a dead part too.
FMUN5334DW1SOT-363Digital transistor (resistors built in), 6 pins, Formosa MicrosemiDigital transistor (resistors built in)SOT-3636 pinsFormosa Microsemi
- What it is
- Digital transistor (resistors built in)
- Maker
- Formosa Microsemi
- Package
- SOT-363
- Pins
- 6
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Digital transistor.
GSFW0200SOT-883N-channel MOSFET, 3 pins, Good-ArkN-channel MOSFETSOT-8833 pinsGood-Ark
- What it is
- N-channel MOSFET
- Maker
- Good-Ark
- Package
- SOT-883
- Pins
- 3
- Details
- N-channel MOSFET, 20 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: N-channel MOSFET.
HXY3134AF3SOT-883N-channel MOSFET, 3 pins, HXYN-channel MOSFETSOT-8833 pinsHXY
- What it is
- N-channel MOSFET
- Maker
- HXY
- Package
- SOT-883
- Pins
- 3
- Details
- N-channel MOSFET, 20 V, 0.7 A
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: N-channel MOSFET.
LMBR340FT1GSOD-123FSchottky diode, 2 pins, LRCSchottky diodeSOD-123F2 pinsLRC
- What it is
- Schottky diode
- Maker
- LRC
- Package
- SOD-123F
- Pins
- 2
- Details
- Schottky diode, VR 40 V, IF 3 A, VF Max 0.5 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
LMUN5334DW1T1GSOT-363Digital transistor (resistors built in), 6 pins, LRCDigital transistor (resistors built in)SOT-3636 pinsLRC
- What it is
- Digital transistor (resistors built in)
- Maker
- LRC
- Package
- SOT-363
- Pins
- 6
- Details
- Digital transistor (bias resistors built in), P+N, IC 100 mA, VCEO 50 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Digital transistor.
MBRX340SOD-123FSchottky diode, 2 pins, Galaxy MicroelectronicsSchottky diodeSOD-123F2 pinsGalaxy Microelectronics
- What it is
- Schottky diode
- Maker
- Galaxy Microelectronics
- Package
- SOD-123F
- Pins
- 2
- Details
- 3A, 40V, Surface Mount Schottky Barrier Rectifiers
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
MMBD1405SOT-23Switching diode, 3 pins, Taitron ComponentsSwitching diodeSOT-233 pinsTaitron Components
- What it is
- Switching diode
- Maker
- Taitron Components
- Package
- SOT-23
- Pins
- 3
- Details
- SMD Switching Diodes (Three Terminals)
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
MUN5334DW1SOT-363Digital transistor (resistors built in), 6 pins, onsemiDigital transistor (resistors built in)SOT-3636 pinsonsemi
- What it is
- Digital transistor (resistors built in)
- Maker
- onsemi
- Package
- SOT-363
- Pins
- 6
- Details
- Complementary Bias Resistor Transistors R1 = 22 k , R2 = 47 k
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Digital transistor.
NSBC124XPDXV6SOT-563Digital transistor (resistors built in), 6 pins, onsemiDigital transistor (resistors built in)SOT-5636 pinsonsemi
- What it is
- Digital transistor (resistors built in)
- Maker
- onsemi
- Package
- SOT-563
- Pins
- 6
- Details
- Complementary Bias Resistor Transistors R1 = 22 k , R2 = 47 k
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Digital transistor.
NSVBC124XPDXV6SOT-563Digital transistor (resistors built in), 6 pins, onsemiDigital transistor (resistors built in)SOT-5636 pinsonsemi
- What it is
- Digital transistor (resistors built in)
- Maker
- onsemi
- Package
- SOT-563
- Pins
- 6
- Details
- Complementary Bias Resistor Transistors R1 = 22 k , R2 = 47 k
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Digital transistor.
NSVMUN5334DW1SOT-363Digital transistor (resistors built in), 6 pins, onsemiDigital transistor (resistors built in)SOT-3636 pinsonsemi
- What it is
- Digital transistor (resistors built in)
- Maker
- onsemi
- Package
- SOT-363
- Pins
- 6
- Details
- Complementary Bias Resistor Transistors R1 = 22 k , R2 = 47 k
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Digital transistor.
4 more parts have no package on record
FM340-MST-Q1Schottky diode, Formosa MicrosemiSchottky diodeNot recordedNot recordedFormosa Microsemi
- What it is
- Schottky diode
- Maker
- Formosa Microsemi
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
FMOSAE0P75N02AE-HMOSFET, Formosa MicrosemiMOSFETNot recordedNot recordedFormosa Microsemi
- What it is
- MOSFET
- Maker
- Formosa Microsemi
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: MOSFET.
FMOSAE0P75N02E-HMOSFET, Formosa MicrosemiMOSFETNot recordedNot recordedFormosa Microsemi
- What it is
- MOSFET
- Maker
- Formosa Microsemi
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: MOSFET.
NCP340MUN-channel MOSFET, onsemiN-channel MOSFETNot recordedNot recordedonsemi
- What it is
- N-channel MOSFET
- Maker
- onsemi
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Soft Start Controlled Load - Switch
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: N-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.
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.
MOSFET
Diode range, part lifted. Test drain to source first, then short gate to source and test again.
Working, it reads
One way between drain and source reads about 0.4 to 0.9 V, the body diode, and the other way open. The gate reads open to both other pins.
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.
- No body diode at all: failed open.
- On the board
- the gate usually has a resistor to the source, which reads as that resistor and 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.
Digital transistor
Ohms range, part lifted. The datasheet gives the built-in resistors: R1 in series with the base, R2 from base to emitter.
Working, it reads
Base to emitter reads about R1 plus R2 either way round, about 20 kΩ on a 10 k and 10 k part, give or take their wide tolerance. Collector to emitter reads open. A part with no R2 reads a junction behind R1 one way instead.
Dead, it reads
- Collector to emitter the same both ways, near 0 Ω with a continuous beep: shorted.
- From the base, open or far above R1 plus R2: R1 has failed. Static damage shows here most often.
- Base to emitter near 0 Ω: failed short.
- 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:
- The readings depend on the resistor values, so an identical part elsewhere on the board is the surest reference. Measure it the same way.
- Watch for:
- On the diode range a good part with 10 kΩ resistors reads open on every pair, so a good part looks dead there. Use the ohms range.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
N-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 source, black on the drain: 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. A drain short can be the load. 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.
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.
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