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.
1.5SMC43SMCTVS diode, 2 pins, HottechTVS diodeSMC2 pinsHottech
- What it is
- TVS diode
- Maker
- Hottech
- Package
- SMC
- Pins
- 2
- Details
- TVS diode, VRWM 34.8 V, unidirectional
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
3.0SMC43SMCTVS diode, 2 pins, YFWTVS diodeSMC2 pinsYFW
- What it is
- TVS diode
- Maker
- YFW
- Package
- SMC
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
ABAS40-HFSOT-23Schottky diode, 3 pins, ComchipSchottky diodeSOT-233 pinsComchip
- What it is
- Schottky diode
- Maker
- Comchip
- Package
- SOT-23
- Pins
- 3
- Details
- 40 V, 0.12 A Schottky barrier diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
ABAS40WS-HFSOD-323Schottky diode, 2 pins, ComchipSchottky diodeSOD-3232 pinsComchip
- What it is
- Schottky diode
- Maker
- Comchip
- Package
- SOD-323
- Pins
- 2
- Details
- 40 V, 0.2 A Schottky barrier diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
ABAS40WT-HFSOT-323Schottky diode, 3 pins, ComchipSchottky diodeSOT-3233 pinsComchip
- What it is
- Schottky diode
- Maker
- Comchip
- Package
- SOT-323
- Pins
- 3
- Details
- 40 V, 0.12 A Schottky barrier diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
ADTC143XE-HFSOT-523Digital transistor (NPN, resistors built in), 3 pins, ComchipDigital transistor (NPN, resistors built in)SOT-5233 pinsComchip
- What it is
- Digital transistor (NPN, resistors built in)
- Maker
- Comchip
- Package
- SOT-523
- 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.
BAS40SOT-23Schottky diode, 3 pins, InfineonSchottky diodeSOT-233 pinsInfineon
- What it is
- Schottky diode
- Maker
- Infineon
- Package
- SOT-23
- Pins
- 3
- Pinout
- 1 anode
- 2 not connected
- 3 cathode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
BAS40-CSOT-23Schottky diode, 3 pins, SeCoSSchottky diodeSOT-233 pinsSeCoS
- What it is
- Schottky diode
- Maker
- SeCoS
- Package
- SOT-23
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
BAS40-HFSOT-23Schottky diode, 3 pins, ComchipSchottky diodeSOT-233 pinsComchip
- What it is
- Schottky diode
- Maker
- Comchip
- Package
- SOT-23
- Pins
- 3
- Details
- 40 V, 0.2 A Schottky barrier diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
BAS40-P2-HFSOT-23Schottky diode, 3 pins, ComchipSchottky diodeSOT-233 pinsComchip
- What it is
- Schottky diode
- Maker
- Comchip
- Package
- SOT-23
- Pins
- 3
- Details
- 40 V, 0.2 A Schottky barrier diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
BAS40-Q1SOT-23Schottky diode, 3 pins, Formosa MicrosemiSchottky diodeSOT-233 pinsFormosa Microsemi
- What it is
- Schottky diode
- Maker
- Formosa Microsemi
- Package
- SOT-23
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
BAS40LSOD-882Schottky diode, 2 pins, Galaxy MicroelectronicsSchottky diodeSOD-8822 pinsGalaxy Microelectronics
- What it is
- Schottky diode
- Maker
- Galaxy Microelectronics
- Package
- SOD-882
- Pins
- 2
- Details
- 0.2A, 40V, Surface Mount Small Signal Schottky Diodes
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
BAS40TSOT-523Schottky diode, 3 pins, Formosa MicrosemiSchottky diodeSOT-5233 pinsFormosa Microsemi
- What it is
- Schottky diode
- Maker
- Formosa Microsemi
- Package
- SOT-523
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
BAS40VSOT-563Schottky diode, 6 pins, Galaxy MicroelectronicsSchottky diodeSOT-5636 pinsGalaxy Microelectronics
- What it is
- Schottky diode
- Maker
- Galaxy Microelectronics
- Package
- SOT-563
- Pins
- 6
- Details
- 0.2A, 40V, Surface Mount Small Signal Schottky Diodes
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
BAS40WSOT-323Schottky diode, 3 pins, Galaxy MicroelectronicsSchottky diodeSOT-3233 pinsGalaxy Microelectronics
- What it is
- Schottky diode
- Maker
- Galaxy Microelectronics
- Package
- SOT-323
- Pins
- 3
- Details
- 0.2A, 40V, Surface Mount Small Signal Schottky Diodes
- 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.
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.
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.
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.
Printed with a code easy to misread as 43-
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 43-
For a marking with its end worn or burnt off. Each code has a page of its own.
Codes not listed here are printed on 526 more parts.
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