SMD code MF
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.
79 parts are printed MF
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.
2SA1235-FSOT-233 pins, IshNot recordedSOT-233 pinsIsh
- What it is
- Not recorded
- Maker
- Ish
- Package
- SOT-23
- Pins
- 3
- Details
- Si-pnp: AF-Amp, 50V, 150mA, 200mW, 200MHz, B=250..500
- Source
- Published code list
Is it dead? The meter test is below: This part.
2SA1235ASOT-23PNP transistor, 3 pins, Galaxy MicroelectronicsPNP transistorSOT-233 pinsGalaxy Microelectronics
- What it is
- PNP transistor
- Maker
- Galaxy Microelectronics
- Package
- SOT-23
- Pins
- 3
- Source
- Published code list
Is it dead? The meter test is below: PNP transistor.
2SA1602-FSOT-3233 pins, MitNot recordedSOT-3233 pinsMit
- What it is
- Not recorded
- Maker
- Mit
- Package
- SOT-323
- Pins
- 3
- Details
- Si-pnp: AF, 50V, 200mA, 150mW, 200MHz, B=250..500
- Source
- Published code list
Is it dead? The meter test is below: This part.
2SC3445SOT-23RF transistor, 3 pins, ToshibaRF transistorSOT-233 pinsToshiba
- What it is
- RF transistor
- Maker
- Toshiba
- Package
- SOT-23
- Pins
- 3
- Details
- Si-npn: UHF, 15V, 80mA, 150mW, 7GHz
- Source
- Published code list
Is it dead? The meter test is below: Bipolar transistor.
7UL1G34FSSOT-9535 pins, ToshibaNot recordedSOT-9535 pinsToshiba
- What it is
- Not recorded
- Maker
- Toshiba
- Package
- SOT-953
- Pins
- 5
- Details
- CMOS logic IC: Noninverting buffer
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
7UL1G34FUSOT-3535 pins, ToshibaNot recordedSOT-3535 pinsToshiba
- What it is
- Not recorded
- Maker
- Toshiba
- Package
- SOT-353
- Pins
- 5
- Details
- CMOS logic IC: Noninverting buffer
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
ASM161RCUSFSOT-143Voltage supervisor, 4 pins, PulseCore SemiconductorVoltage supervisorSOT-1434 pinsPulseCore Semiconductor
- What it is
- Voltage supervisor
- Maker
- PulseCore Semiconductor
- Package
- SOT-143
- Pins
- 4
- Details
- Voltage detector IC: 2.63V±2%, -MR, -Reset ODO, Lead-free
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
BD52E30GSOT-23-5Voltage supervisor, 5 pins, ROHMVoltage supervisorSOT-23-55 pinsROHM
- What it is
- Voltage supervisor
- Maker
- ROHM
- Package
- SOT-23-5
- Pins
- 5
- Details
- Voltage Detector
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
7 more parts have no package on record
74LVC1G08FX4Diodes IncorporatedNot recordedNot recordedNot recordedDiodes Incorporated
- What it is
- Not recorded
- Maker
- Diodes Incorporated
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS logic IC: 2-input AND gate
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
BD49L40GVoltage supervisor, ROHMVoltage supervisorNot recordedNot recordedROHM
- What it is
- Voltage supervisor
- Maker
- ROHM
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage Detector
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
BD52E30G-MVoltage supervisor, ROHMVoltage supervisorNot recordedNot recordedROHM
- What it is
- Voltage supervisor
- Maker
- ROHM
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 3.0V±1%, -Reset ODO
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
BD5225FVEVoltage supervisor, ROHMVoltage supervisorNot recordedNot recordedROHM
- What it is
- Voltage supervisor
- Maker
- ROHM
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS-IC: Voltage Detector 2,5V, Reset Open drain output
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
BD5225GVoltage supervisor, ROHMVoltage supervisorNot recordedNot recordedROHM
- What it is
- Voltage supervisor
- Maker
- ROHM
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS-IC: Voltage Detector 2,5V, Reset Open drain output
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
BF1100WRPhiNot recordedNot recordedNot recordedPhi
- What it is
- Not recorded
- Maker
- Phi
- Package
- Not recorded
- Pins
- Not recorded
- Details
- n-ch uhf dg mosfet
- Source
- Published code list
Is it dead? The meter test is below: N-channel MOSFET.
BU45L344GVoltage supervisor, ROHMVoltage supervisorNot recordedNot recordedROHM
- What it is
- Voltage supervisor
- Maker
- ROHM
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 3.4V±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.
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.
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.
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.
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.
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