SMD code 43-
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.
145 parts are printed 43-
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.
DTC143XEBSOT-416Digital transistor (NPN, resistors built in), 3 pins, ROHMDigital transistor (NPN, resistors built in)SOT-4163 pinsROHM
- What it is
- Digital transistor (NPN, resistors built in)
- Maker
- ROHM
- Package
- SOT-416
- Pins
- 3
- Details
- NPN digital transistor (bias resistor built-in); R1 = 4.7kOhm, R2 = 10kOhm
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Digital transistor.
DTC143XKASOT-23Digital transistor (NPN, resistors built in), 3 pins, ROHMDigital transistor (NPN, resistors built in)SOT-233 pinsROHM
- What it is
- Digital transistor (NPN, resistors built in)
- Maker
- ROHM
- Package
- SOT-23
- Pins
- 3
- Details
- NPN digital transistor (bias resistors built in)
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Digital transistor.
DTC143XMSOT-723Digital transistor (NPN, resistors built in), 3 pins, JSCJDigital transistor (NPN, resistors built in)SOT-7233 pinsJSCJ
- What it is
- Digital transistor (NPN, resistors built in)
- Maker
- JSCJ
- Package
- SOT-723
- Pins
- 3
- Details
- Digital transistor (bias resistors built in), NPN
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Digital transistor.
DTC143XM-HFSOT-723Digital transistor (NPN, resistors built in), 3 pins, ComchipDigital transistor (NPN, resistors built in)SOT-7233 pinsComchip
- What it is
- Digital transistor (NPN, resistors built in)
- Maker
- Comchip
- Package
- SOT-723
- Pins
- 3
- Details
- NPN digital transistor, R1 4.7 kΩ, R2 10 kΩ
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Digital transistor.
DTC143XU3SOT-323Digital transistor (NPN, resistors built in), 3 pins, ROHMDigital transistor (NPN, resistors built in)SOT-3233 pinsROHM
- What it is
- Digital transistor (NPN, resistors built in)
- Maker
- ROHM
- Package
- SOT-323
- Pins
- 3
- Details
- NPN 50V, 100mA digital transistor (bias resistor built-in)
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Digital transistor.
DTC143XUASOT-323Digital transistor (NPN, resistors built in), 3 pins, JSCJDigital transistor (NPN, resistors built in)SOT-3233 pinsJSCJ
- What it is
- Digital transistor (NPN, resistors built in)
- Maker
- JSCJ
- Package
- SOT-323
- Pins
- 3
- Details
- Digital transistor (bias resistors built in), NPN
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Digital transistor.
DTC143XUA-HFSOT-323Digital transistor (NPN, resistors built in), 3 pins, ComchipDigital transistor (NPN, resistors built in)SOT-3233 pinsComchip
- What it is
- Digital transistor (NPN, resistors built in)
- Maker
- Comchip
- Package
- SOT-323
- Pins
- 3
- Details
- NPN digital transistor, R1 4.7 kΩ, R2 10 kΩ
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Digital transistor.
DTC143XUBSOT-323Digital transistor (NPN, resistors built in), 3 pins, ROHMDigital transistor (NPN, resistors built in)SOT-3233 pinsROHM
- What it is
- Digital transistor (NPN, resistors built in)
- Maker
- ROHM
- Package
- SOT-323
- Pins
- 3
- Details
- NPN digital transistor (bias resistor built-in); R1 = 4.7kOhm, R2 = 10kOhm
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Digital transistor.
EMF30G02KSOT-23-6Dual N-channel MOSFET, 6 pins, Excelliance MOSDual N-channel MOSFETSOT-23-66 pinsExcelliance MOS
- What it is
- Dual N-channel MOSFET
- Maker
- Excelliance MOS
- Package
- SOT-23-6
- Pins
- 6
- Details
- 20 V, 5 A dual N-channel MOSFET
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: N-channel MOSFET pair.
GSBAS40MSOD-523Schottky diode, 2 pins, Good-ArkSchottky diodeSOD-5232 pinsGood-Ark
- What it is
- Schottky diode
- Maker
- Good-Ark
- Package
- SOD-523
- Pins
- 2
- Details
- Schottky diode, 40 V, 200 mA
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
GT4350SOT-23NPN transistor, 3 pins, Galaxy MicroelectronicsNPN transistorSOT-233 pinsGalaxy Microelectronics
- What it is
- NPN transistor
- Maker
- Galaxy Microelectronics
- Package
- SOT-23
- Pins
- 3
- Details
- 50V, 2A, General Purpose NPN Bipolar Transistor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
JSPL0240ASOT-23Schottky diode, 3 pins, JieJieSchottky diodeSOT-233 pinsJieJie
- What it is
- Schottky diode
- Maker
- JieJie
- Package
- SOT-23
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
3 more parts have no package on record
EMI4192MTESD protection diode, onsemiESD protection diodeNot recordedNot recordedonsemi
- What it is
- ESD protection diode
- Maker
- onsemi
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Common Mode Filter with ESD Protection
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
ET9543ETEKNot recordedNot recordedNot recordedETEK
- What it is
- Not recorded
- Maker
- ETEK
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: This part.
GSBAS40LPSchottky diode, Good-ArkSchottky diodeNot recordedNot recordedGood-Ark
- What it is
- Schottky diode
- Maker
- Good-Ark
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Schottky diode, 40 V, 200 mA
- 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.
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 pair
Diode range, part lifted. Test drain to source first, then short gate to source and test again. Test each MOSFET on its own pins, as the datasheet's pinout gives them.
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.
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.
This part
Diode range and ohms range, part lifted.
Working, it reads
Depends on what it is. The datasheet, or an identical part, says.
Dead, it reads
- Between two pins, the same reading both ways, near 0 V with a continuous beep: shorted.
- Open between every pair of pins: failed open, or a part that reads open when working.
- 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.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
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.
NPN transistor
Diode range, part lifted or its base leg off the pad.
Working, it reads
Red probe on the base reads about 0.6 to 0.75 V to the emitter and to the collector, and open the other way round. Collector to emitter reads open both ways.
Dead, it reads
- Collector to emitter the same both ways, near 0 V with a continuous beep: shorted. The commonest failure.
- The base the same both ways to another pin, near 0 V or a middling value: a shorted junction.
- Only one junction reads, or none: a junction has failed open. It then looks like a diode.
- A reading the wrong way round, where it should be open: 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 pair of diodes with a common pin reads just like a transistor, and some transistors carry a built-in diode or resistor. The datasheet says which.
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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