SMD code KNM
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.
24 parts are printed KNM
Not sure which one you have?
Answer up to 4 quick questions and these 24 parts are ranked, with a meter test that settles it. It works on a dead part too.
MMBT5451DWSOT-363Transistor, 6 pins, YFWTransistorSOT-3636 pinsYFW
- What it is
- Transistor
- Maker
- YFW
- Package
- SOT-363
- Pins
- 6
- Details
- Bipolar transistor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Bipolar transistor.
MMDT5451SOT-363Transistor, 6 pins, Galaxy MicroelectronicsTransistorSOT-3636 pinsGalaxy Microelectronics
- What it is
- Transistor
- Maker
- Galaxy Microelectronics
- Package
- SOT-363
- Pins
- 6
- Details
- Bipolar transistor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Bipolar transistor.
MMDT5451DWSOT-363Transistor, 6 pins, YFWTransistorSOT-3636 pinsYFW
- What it is
- Transistor
- Maker
- YFW
- Package
- SOT-363
- Pins
- 6
- Details
- Bipolar transistor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Bipolar transistor.
SMB10J64ASMBFTVS diode, 2 pins, Formosa MicrosemiTVS diodeSMBF2 pinsFormosa Microsemi
- What it is
- TVS diode
- Maker
- Formosa Microsemi
- Package
- SMBF
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
TMMDT5451SOT-363Complementary transistor pair (NPN and PNP), 6 pins, Galaxy MicroelectronicsComplementary transistor pair (NPN and PNP)SOT-3636 pinsGalaxy Microelectronics
- What it is
- Complementary transistor pair (NPN and PNP)
- Maker
- Galaxy Microelectronics
- Package
- SOT-363
- Pins
- 6
- Details
- 160V, 0.2A, General Purpose NPN Bipolar Transistor -150V, -0.2A, General Purpose PNP Bipolar Transistor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Bipolar transistor pair.
HBNP54S6SOT-363Complementary transistor pair (NPN and PNP), 6 pins, CYStekComplementary transistor pair (NPN and PNP)SOT-3636 pinsCYStek
- What it is
- Complementary transistor pair (NPN and PNP)
- Maker
- CYStek
- Package
- SOT-363
- Pins
- 6
- Details
- 160/-160 V, 0.6/-0.6 A NPN+PNP transistor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Bipolar transistor pair.
HBNP54S6RSOT-363Complementary transistor pair (NPN and PNP), 6 pins, CYStekComplementary transistor pair (NPN and PNP)SOT-3636 pinsCYStek
- What it is
- Complementary transistor pair (NPN and PNP)
- Maker
- CYStek
- Package
- SOT-363
- Pins
- 6
- Details
- 160/-160 V, 0.6/-0.6 A NPN+PNP transistor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Bipolar transistor pair.
IXD3235D0MCER-GUSP-6CDC-DC converter, 6 pins, IXYSDC-DC converterUSP-6C6 pinsIXYS
- What it is
- DC-DC converter
- Maker
- IXYS
- Package
- USP-6C
- Pins
- 6
- Details
- DC/DC voltage converter IC: PWM, st-dwn, 0.95V±2%, 600mA, 1.2MHz, Vin>1.8V, LSST, CL
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
IXD3235D0MCMR-GSOT-23-5DC-DC converter, 5 pins, IXYSDC-DC converterSOT-23-55 pinsIXYS
- What it is
- DC-DC converter
- Maker
- IXYS
- Package
- SOT-23-5
- Pins
- 5
- Details
- DC/DC voltage converter IC: PWM, st-dwn, 0.95V±2%, 600mA, 1.2MHz, Vin>1.8V, LSST, CL
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
IXD5124A219MR-GSOT-23-5Voltage supervisor, 5 pins, IXYSVoltage supervisorSOT-23-55 pinsIXYS
- What it is
- Voltage supervisor
- Maker
- IXYS
- Package
- SOT-23-5
- Pins
- 5
- Details
- Voltage detector IC: 1.9V±2%, -Reset ODO, -WDEN, PDR, Wt=50ms, Rdt=3.13ms
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
IXD5124A249MR-GSOT-23-5Voltage supervisor, 5 pins, IXYSVoltage supervisorSOT-23-55 pinsIXYS
- What it is
- Voltage supervisor
- Maker
- IXYS
- Package
- SOT-23-5
- Pins
- 5
- Details
- Voltage detector IC: 4.9V±2%, -Reset ODO, -WDEN, PDR, Wt=50ms, Rdt=3.13ms
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
LD6991GU-2120SOT-3636 pins, LeadtrendNot recordedSOT-3636 pinsLeadtrend
- What it is
- Not recorded
- Maker
- Leadtrend
- Package
- SOT-363
- Pins
- 6
- Details
- Linear voltage regulator with volatge detector: LDO, 2.1V±2%, 90mA, Vdet=2.0V±2%, -Reset ODO
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
MMST5451SOT-3636 pins, Diodes IncorporatedNot recordedSOT-3636 pinsDiodes Incorporated
- What it is
- Not recorded
- Maker
- Diodes Incorporated
- Package
- SOT-363
- Pins
- 6
- Details
- npn/pnp pair 5401/5551
- Source
- Published code list
Is it dead? The meter test is below: This part.
2 more parts have no package on record
IXD3235D0MC0R-GDC-DC converter, IXYSDC-DC converterNot recordedNot recordedIXYS
- What it is
- DC-DC converter
- Maker
- IXYS
- Package
- Not recorded
- Pins
- Not recorded
- Details
- DC/DC voltage converter IC: PWM, st-dwn, 0.95V±2%, 600mA, 1.2MHz, Vin>1.8V, LSST, CL
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
IXD3235D0MC4R-GDC-DC converter, IXYSDC-DC converterNot recordedNot recordedIXYS
- What it is
- DC-DC converter
- Maker
- IXYS
- Package
- Not recorded
- Pins
- Not recorded
- Details
- DC/DC voltage converter IC: PWM, st-dwn, 0.95V±2%, 600mA, 1.2MHz, Vin>1.8V, LSST, CL
- 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.
Bipolar transistor
Diode range, part lifted or its base leg off the pad.
Working, it reads
From the base, one probe colour 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.
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.
Bipolar transistor pair
Diode range, part lifted. Test each transistor on its own pins, as the datasheet's pinout gives them.
Working, it reads
From the base, one probe colour 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.
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.
Voltage regulator
Voltage, board powered, black probe on ground. Then ohms with the power off.
Working, it reads
Input pin at the supply, output pin at its rated voltage, and the enable pin high if it has one.
Dead, it reads
- Output equal to the input: the pass element has shorted. Everything after it may have taken the full input.
- Input present, enable high, no output: failed open, or holding itself off into a shorted load. Power off and measure output to ground.
- Power off, input to output near 0 Ω: shorted.
- On the board:
- An output at 0 V is often a shorted load with the regulator in current limit. Lift the output pin: if the short stays on the board, the regulator may be fine.
- Compare:
- The same regulator on another rail or another board shows the right voltages and the right resistances.
- Watch for:
- Makers put input, output and ground on different pins in the same package, so take them from this part's datasheet. Diode or ohms readings between its pins say little; check it powered.
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.
Did you find your part?
Open this in the search to correct a character or try another package.