SMD code W1 in SMC
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.
1 part in SMC is printed W1
Not sure which one you have?
Answer up to 4 quick questions and these 13 parts are ranked, with a meter test that settles it. It works on a dead part too.
FES3ASMC2 pins, FagNot recorded2 pinsFag
- What it is
- Not recorded
- Maker
- Fag
- Package
- SMC
- Pins
- 2
- Details
- Si-diode: Ultrafast Recovery, 50V, 3A, <50ns
- Source
- Published code list
Is it dead? The meter test is below: Silicon diode.
12 more parts have no package on record. Nothing rules them out, so they stay.
DW52C2V7Zener diode, SeCoSZener diodeNot recordedSeCoS
- What it is
- Zener diode
- Maker
- SeCoS
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
AP1701GTWAnachipNot recordedNot recordedAnachip
- What it is
- Not recorded
- Maker
- Anachip
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS-IC: Voltage Detector, 2,25V, -Reset Push-pull output
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
AP8822C-31GIVoltage supervisor, Anwell SemiconductorVoltage supervisorNot recordedAnwell Semiconductor
- What it is
- Voltage supervisor
- Maker
- Anwell Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 3.1V±2%, -Reset PPO, 200ms Rt delay, H-free
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
AP8822C-31GSVoltage supervisor, Anwell SemiconductorVoltage supervisorNot recordedAnwell Semiconductor
- What it is
- Voltage supervisor
- Maker
- Anwell Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 3.1V±2%, -Reset PPO, 200ms Rt delay, H-free
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
AP8822C-31PIVoltage supervisor, Anwell SemiconductorVoltage supervisorNot recordedAnwell Semiconductor
- What it is
- Voltage supervisor
- Maker
- Anwell Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 3.1V±2%, -Reset PPO, 200ms Rt delay
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
AP8822C-31PSVoltage supervisor, Anwell SemiconductorVoltage supervisorNot recordedAnwell Semiconductor
- What it is
- Voltage supervisor
- Maker
- Anwell Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 3.1V±2%, -Reset PPO, 200ms Rt delay
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
BD46235GVoltage supervisor, ROHMVoltage supervisorNot recordedROHM
- What it is
- Voltage supervisor
- Maker
- ROHM
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS-IC: Voltage Detector 2,3V, -Reset Push-pull output, 500ms
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
BZT52C2V7LPZener diode, Diodes IncorporatedZener diodeNot recordedDiodes Incorporated
- What it is
- Zener diode
- Maker
- Diodes Incorporated
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Zener diode: 2.5..2.9V, Izt=5mA, Zzt=100, 250mW
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
EC95810C31C7IVoltage supervisor, E-CMOSVoltage supervisorNot recordedE-CMOS
- What it is
- Voltage supervisor
- Maker
- E-CMOS
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 3.1V±2%, -Reset PPO, Td=200ms
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
EC95810C31C7SVoltage supervisor, E-CMOSVoltage supervisorNot recordedE-CMOS
- What it is
- Voltage supervisor
- Maker
- E-CMOS
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 3.1V±2%, -Reset PPO, Td=200ms
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
HD74LV1GW98ACMRenesasNot recordedNot recordedRenesas
- What it is
- Not recorded
- Maker
- Renesas
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS logic IC: Configurable multiple-function gate
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
PESD3V3V4UW5 pins, NexperiaNot recorded5 pinsNexperia
- What it is
- Not recorded
- Maker
- Nexperia
- Package
- Not recorded
- Pins
- 5
- Source
- Published code list
Is it dead? The meter test is below: This part.
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.
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.
Zener diode
Diode range for the forward check, part lifted, red probe on the anode. A bench supply for the Zener voltage.
Working, it reads
About 0.6 to 0.8 V forward and open in reverse on the diode range. Its Zener voltage shows only on a supply: feed it through a resistor that sets about 5 mA, cathode to positive, read quickly, and it should hold near its rated voltage.
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, forward too: failed open.
- Holds well off its rated voltage on the supply test: drifted.
- A soft knee, or a voltage that creeps on the supply test: 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 meter's diode range stops at about 2 to 3 V, so almost every Zener reads open in reverse on it, good or bad; a 3 V meter may just show a 2.4 or 2.7 V part. Above about 3 V the meter cannot tell a Zener from a plain diode.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Integrated circuit
Voltage with the board powered; ohms from each pin to ground with it off.
Working, it reads
Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.
Dead, it reads
- A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
- Supply present, output stuck: failed, or its load has.
- On the board:
- A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
- Compare:
- The surest reference is the same IC on a working board, measured pin by pin.
- Watch for:
- Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.
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.
Printed with a code easy to misread as W1
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 W1
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 29 more parts.
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