SMD code W2-
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.
144 parts are printed W2-
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.
ELM7632LBBSOT-23Voltage supervisor, 3 pins, ELM TechnologyVoltage supervisorSOT-233 pinsELM Technology
- What it is
- Voltage supervisor
- Maker
- ELM Technology
- Package
- SOT-23
- Pins
- 3
- Details
- Voltage detector IC: 3.2V±2%, -Reset PPO, Rdt=500ms
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
FES3BSMC2 pins, FagNot recordedSMC2 pinsFag
- What it is
- Not recorded
- Maker
- Fag
- Package
- SMC
- Pins
- 2
- Details
- Si-diode: Ultrafast Recovery, 100V, 3A, <50ns
- Source
- Published code list
Is it dead? The meter test is below: Silicon diode.
FMW2SOT-23-55 pins, ROHMNot recordedSOT-23-55 pinsROHM
- What it is
- Not recorded
- Maker
- ROHM
- Package
- SOT-23-5
- Pins
- 5
- Details
- Si-npn: Dual, GP, 60V, 150mA, 180MHz
- Source
- Published code list
Is it dead? The meter test is below: This part.
MC74VHC1G126DFTSOT-23-55 pins, onsemiNot recordedSOT-23-55 pinsonsemi
- What it is
- Not recorded
- Maker
- onsemi
- Package
- SOT-23-5
- Pins
- 5
- Source
- Published code list
Is it dead? The meter test is below: This part.
MC74VHC1G126DTSOT-23-55 pins, onsemiNot recordedSOT-23-55 pinsonsemi
- What it is
- Not recorded
- Maker
- onsemi
- Package
- SOT-23-5
- Pins
- 5
- Details
- CMOS-Logic: Noninverting 3-State Buffer
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
MC74VHC1G126DTTSOT-23-55 pins, onsemiNot recordedSOT-23-55 pinsonsemi
- What it is
- Not recorded
- Maker
- onsemi
- Package
- SOT-23-5
- Pins
- 5
- Source
- Published code list
Is it dead? The meter test is below: This part.
MEZ02-2.7-D3SOD-323Zener diode, 2 pins, Matsuki Electronic CompanyZener diodeSOD-3232 pinsMatsuki Electronic Company
- What it is
- Zener diode
- Maker
- Matsuki Electronic Company
- Package
- SOD-323
- Pins
- 2
- Details
- Zener diode: 2.57..2.84V, Izt=5mA, Zzt=83, 200mW
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
NLV74VHC1G126DFSOT-23-55 pins, onsemiNot recordedSOT-23-55 pinsonsemi
- What it is
- Not recorded
- Maker
- onsemi
- Package
- SOT-23-5
- Pins
- 5
- Details
- CMOS logic IC: Bus buffer gate with 3-state output
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
PBR951SOT-233 pins, NXPNot recordedSOT-233 pinsNXP
- What it is
- Not recorded
- Maker
- NXP
- Package
- SOT-23
- Pins
- 3
- Details
- npn UHF wb RF ft 8.5GHz
- Source
- Published code list
Is it dead? The meter test is below: This part.
PBR957SOT-3233 pins, NXPNot recordedSOT-3233 pinsNXP
- What it is
- Not recorded
- Maker
- NXP
- Package
- SOT-323
- Pins
- 3
- Details
- npn UHF wb RF ft 8.5GHz
- Source
- Published code list
Is it dead? The meter test is below: This part.
PRF957SOT-3233 pins, PhiNot recordedSOT-3233 pinsPhi
- What it is
- Not recorded
- Maker
- Phi
- Package
- SOT-323
- Pins
- 3
- Details
- Si-npn: UHF, LN, 20V, 100mA, 270mW, B=50..200, 8,5GHz
- Source
- Published code list
Is it dead? The meter test is below: This part.
4 more parts have no package on record
EC95810C32C7IVoltage supervisor, E-CMOSVoltage supervisorNot recordedNot recordedE-CMOS
- What it is
- Voltage supervisor
- Maker
- E-CMOS
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 3.2V±2%, -Reset PPO, Td=200ms
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
EC95810C32C7SVoltage supervisor, E-CMOSVoltage supervisorNot recordedNot recordedE-CMOS
- What it is
- Voltage supervisor
- Maker
- E-CMOS
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 3.2V±2%, -Reset PPO, Td=200ms
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
HD74LV1GW97ACMRenesasNot recordedNot 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.
PESD5V0V4UW5 pins, NexperiaNot recordedNot 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.
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.
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.
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.
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.
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