SMD code ZC- in SOT-23
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.
12 parts in SOT-23 are printed ZC-
Not sure which one you have?
Answer up to 4 quick questions and these 47 parts are ranked, with a meter test that settles it. It works on a dead part too.
2N3904SSOT-23NPN transistor, Taitron ComponentsNPN transistorTaitron Components
- What it is
- NPN transistor
- Maker
- Taitron Components
- Package
- SOT-23
- Pins
- 3
- Details
- Bipolar transistor, 40 V, 0.2 A
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
MMBT4124LSOT-23NPN transistor, onsemiNPN transistoronsemi
- What it is
- NPN transistor
- Maker
- onsemi
- Package
- SOT-23
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
2N3906SSOT-23PNP transistor, KECPNP transistorKEC
- What it is
- PNP transistor
- Maker
- KEC
- Package
- SOT-23
- Pins
- 3
- Details
- Bipolar transistor, 40 V, 0.2 A
- Source
- An older or alternative marking, from a published code list
Is it dead? The meter test is below: PNP transistor.
2SK217-CSOT-23RenesasNot recordedRenesas
- What it is
- Not recorded
- Maker
- Renesas
- Package
- SOT-23
- Pins
- 3
- Details
- FET n-type: VHF, 30V, 20mA, 150mA, Idss=2.5..5mA, Up<2.5V
- Source
- Published code list
Is it dead? The meter test is below: MOSFET.
BCW60RCSOT-23VishayNot recordedVishay
- What it is
- Not recorded
- Maker
- Vishay
- Package
- SOT-23
- Pins
- 3
- Details
- equivalent BC548B
- Source
- Published code list
Is it dead? The meter test is below: This part.
BZX84C2V7SOT-23Zener diode, Diodes IncorporatedZener diodeDiodes Incorporated
- What it is
- Zener diode
- Maker
- Diodes Incorporated
- Package
- SOT-23
- Pins
- 3
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
FMMT4124SOT-23Not recordedNot recorded
- What it is
- Not recorded
- Maker
- Not recorded
- Package
- SOT-23
- Pins
- 3
- Details
- 2N4124
- Source
- Published code list
Is it dead? The meter test is below: This part.
KST4124SOT-23Fairchild SemiconductorNot recordedFairchild Semiconductor
- What it is
- Not recorded
- Maker
- Fairchild Semiconductor
- Package
- SOT-23
- Pins
- 3
- Details
- Si-npn: Sw, 30V, 200mA, 330mW, B=120..360, >300MHz
- Source
- Published code list
Is it dead? The meter test is below: This part.
MMBT3904SOT-23NPN transistorNPN transistorNot recorded
- What it is
- NPN transistor
- Maker
- Not recorded
- Package
- SOT-23
- Pins
- 3
- Details
- NPN bipolar transistor
- Source
- Published code list
Is it dead? The meter test is below: NPN transistor.
MMBT4124SOT-23NPN transistor, Fairchild SemiconductorNPN transistorFairchild Semiconductor
- What it is
- NPN transistor
- Maker
- Fairchild Semiconductor
- Package
- SOT-23
- Pins
- 3
- Details
- Bipolar transistor, 40 V, 0.2 A
- Source
- Published code list
Is it dead? The meter test is below: NPN transistor.
MMBT4124LT1SOT-23onsemiNot recordedonsemi
- What it is
- Not recorded
- Maker
- onsemi
- Package
- SOT-23
- Pins
- 3
- Details
- equivalent 2N4124
- Source
- Published code list
Is it dead? The meter test is below: This part.
YTS4124SOT-23NPN transistor, ToshibaNPN transistorToshiba
- What it is
- NPN transistor
- Maker
- Toshiba
- Package
- SOT-23
- Pins
- 3
- Details
- Si-npn: Sw, 30V, 200mA, 330mW, B=120..360, >300MHz
- Source
- Published code list
Is it dead? The meter test is below: NPN transistor.
3 more parts have no package on record. Nothing rules them out, so they stay.
ACZRQC52C6V2-HFZener diode, ComchipZener diodeComchip
- What it is
- Zener diode
- Maker
- Comchip
- Package
- Not recorded
- Pins
- Not recorded
- Details
- 6.2 V 0.125 mW zener diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
ACZRUC52C6V2-HFZener diode, ComchipZener diodeComchip
- What it is
- Zener diode
- Maker
- Comchip
- Package
- Not recorded
- Pins
- Not recorded
- Details
- 6.2 V 150 mW zener diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
CZRF52C6V2-HFZener diode, ComchipZener diodeComchip
- What it is
- Zener diode
- Maker
- Comchip
- Package
- Not recorded
- Pins
- Not recorded
- Details
- 6.2 V 0.35 mW zener diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener 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.
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.
PNP transistor
Diode range, part lifted or its base leg off the pad.
Working, it reads
Black 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.
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.
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.
Printed with a code easy to misread as ZC-
One character differs, and it is one that is easy to confuse under a lamp. Each code has a page of its own.
Codes not listed here are printed on 168 more parts.
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