SMD code -MK
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.
116 parts are printed -MK
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.
BF997SOT-1434 pins, InfineonNot recordedSOT-1434 pinsInfineon
- What it is
- Not recorded
- Maker
- Infineon
- Package
- SOT-143
- Pins
- 4
- Details
- n-MOS*-d: Dual-Gate, 20V, 30mA, 200mW, Nf=1dB, ldss=20mA, Gf>15mΩ
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
BZT52C3V0SOD-123Zener diode, 2 pins, DiotecZener diodeSOD-1232 pinsDiotec
- What it is
- Zener diode
- Maker
- Diotec
- Package
- SOD-123
- Pins
- 2
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
BZT52C3V0WSOD-123Zener diode, 2 pins, JinYu semiconductorZener diodeSOD-1232 pinsJinYu semiconductor
- What it is
- Zener diode
- Maker
- JinYu semiconductor
- Package
- SOD-123
- Pins
- 2
- Details
- Zener diode: 2.85..3.15V, Izt=5mA, Zzt=100, 500mW
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
BZX84C62CCSOT-23Zener diode, 3 pins, JinYu semiconductorZener diodeSOT-233 pinsJinYu semiconductor
- What it is
- Zener diode
- Maker
- JinYu semiconductor
- Package
- SOT-23
- Pins
- 3
- Details
- Zener diode: Dual, 58..66V, Zzt=215, Izt=2mA, 350mW
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
CD214B-T30ASMBTVS diode, 2 pins, BournsTVS diodeSMB2 pinsBourns
- What it is
- TVS diode
- Maker
- Bourns
- Package
- SMB
- Pins
- 2
- Details
- TVS: 30V, 12.4A, 600W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
DDZ9713SOD-123Zener diode, 2 pins, Diodes IncorporatedZener diodeSOD-1232 pinsDiodes Incorporated
- What it is
- Zener diode
- Maker
- Diodes Incorporated
- Package
- SOD-123
- Pins
- 2
- Details
- Z-diode: 30V±5%, 500mW
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
DDZ9713SSOD-323Zener diode, 2 pins, Diodes IncorporatedZener diodeSOD-3232 pinsDiodes Incorporated
- What it is
- Zener diode
- Maker
- Diodes Incorporated
- Package
- SOD-323
- Pins
- 2
- Details
- Z-diode: 30V±5%, 200mW
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
DDZ9713TSOD-523Zener diode, 2 pins, Diodes IncorporatedZener diodeSOD-5232 pinsDiodes Incorporated
- What it is
- Zener diode
- Maker
- Diodes Incorporated
- Package
- SOD-523
- Pins
- 2
- Details
- Zener diode: 30V±1%, If=10mA, 150mW
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
DDZX9713SOT-23Zener diode, 3 pins, Diodes IncorporatedZener diodeSOT-233 pinsDiodes Incorporated
- What it is
- Zener diode
- Maker
- Diodes Incorporated
- Package
- SOT-23
- Pins
- 3
- Details
- Z-diode: 30V±5%, 500mW
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
DDZX9713TSSOT-3636 pins, Diodes IncorporatedNot recordedSOT-3636 pinsDiodes Incorporated
- What it is
- Not recorded
- Maker
- Diodes Incorporated
- Package
- SOT-363
- Pins
- 6
- Details
- Z-diode: Triple, 3x30V±5%, 200mW
- Source
- Published code list
Is it dead? The meter test is below: Silicon diode.
DDZX9713WSOT-3233 pins, Diodes IncorporatedNot recordedSOT-3233 pinsDiodes Incorporated
- What it is
- Not recorded
- Maker
- Diodes Incorporated
- Package
- SOT-323
- Pins
- 3
- Details
- Z-diode: 30V±5%, 200mW
- Source
- Published code list
Is it dead? The meter test is below: Silicon diode.
4 more parts have no package on record
BD5229FVEVoltage supervisor, ROHMVoltage supervisorNot recordedNot recordedROHM
- What it is
- Voltage supervisor
- Maker
- ROHM
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS-IC: Voltage Detector 2,9V, Reset Open drain output
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
BD5229GVoltage supervisor, ROHMVoltage supervisorNot recordedNot recordedROHM
- What it is
- Voltage supervisor
- Maker
- ROHM
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS-IC: Voltage Detector 2,9V, Reset Open drain output
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
BF1211WRNXPNot recordedNot recordedNot recordedNXP
- What it is
- Not recorded
- Maker
- NXP
- Package
- Not recorded
- Pins
- Not recorded
- Details
- n-ch dg uhf mosfet, 5V
- Source
- Published code list
Is it dead? The meter test is below: N-channel MOSFET.
BU45L374GVoltage supervisor, ROHMVoltage supervisorNot recordedNot recordedROHM
- What it is
- Voltage supervisor
- Maker
- ROHM
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 3.7V±1%, -Reset ODO, Rdt=400ms
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
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.
N-channel MOSFET
Diode range, part lifted. Test drain to source first, then short gate to source and test again.
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.
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.
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.
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.
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