SMD code BMp
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.
The last letter, p, is lower case, which on NXP and Philips parts is a date or factory code, so it was set aside and BM was searched.
194 parts are printed BMp
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.
AP1772B-30PCSOT-23LDO regulator, 3 pins, Anwell SemiconductorLDO regulatorSOT-233 pinsAnwell Semiconductor
- What it is
- LDO regulator
- Maker
- Anwell Semiconductor
- Package
- SOT-23
- Pins
- 3
- Details
- Linear voltage regulator IC: LDO, 3.0V±2%, 300mA, Pb-free
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
AP1772B-30PC1SOT-23LDO regulator, 3 pins, Anwell SemiconductorLDO regulatorSOT-233 pinsAnwell Semiconductor
- What it is
- LDO regulator
- Maker
- Anwell Semiconductor
- Package
- SOT-23
- Pins
- 3
- Details
- Linear voltage regulator IC: LDO, 3.0V±1%, 300mA, Pb-free
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
AP1772B-30PXSOT-323LDO regulator, 3 pins, Anwell SemiconductorLDO regulatorSOT-3233 pinsAnwell Semiconductor
- What it is
- LDO regulator
- Maker
- Anwell Semiconductor
- Package
- SOT-323
- Pins
- 3
- Details
- Linear voltage regulator IC: LDO, 3.0V±2%, 300mA, Pb-free
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
AP1772B-30PX1SOT-323LDO regulator, 3 pins, Anwell SemiconductorLDO regulatorSOT-3233 pinsAnwell Semiconductor
- What it is
- LDO regulator
- Maker
- Anwell Semiconductor
- Package
- SOT-323
- Pins
- 3
- Details
- Linear voltage regulator IC: LDO, 3.0V±1%, 300mA, Pb-free
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
AP2552AFDCSOT-23-6Load switch, 6 pins, Diodes IncorporatedLoad switchSOT-23-66 pinsDiodes Incorporated
- What it is
- Load switch
- Maker
- Diodes Incorporated
- Package
- SOT-23-6
- Pins
- 6
- Details
- Power switch
- Source
- Published code list
Is it dead? The meter test is below: Load switch.
AP2552AW6SOT-23-6Load switch, 6 pins, Diodes IncorporatedLoad switchSOT-23-66 pinsDiodes Incorporated
- What it is
- Load switch
- Maker
- Diodes Incorporated
- Package
- SOT-23-6
- Pins
- 6
- Details
- Power switch
- Source
- Published code list
Is it dead? The meter test is below: Load switch.
AX6608AR-25RSOT-23LDO regulator, 3 pins, AXElite TechnologyLDO regulatorSOT-233 pinsAXElite Technology
- What it is
- LDO regulator
- Maker
- AXElite Technology
- Package
- SOT-23
- Pins
- 3
- Details
- Linear voltage regulator IC: LDO, 2.5V±2%, 300mA
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
BCP55-16SOT-2234 pins, NexperiaNot recordedSOT-2234 pinsNexperia
- What it is
- Not recorded
- Maker
- Nexperia
- Package
- SOT-223
- Pins
- 4
- Details
- Si-npn: AF, 60V, 1A, 1,3W, B=100..250, 115MHz
- Source
- Published code list
Is it dead? The meter test is below: This part.
BCX55-10SOT-89NPN transistor, 3 pins, NexperiaNPN transistorSOT-893 pinsNexperia
- What it is
- NPN transistor
- Maker
- Nexperia
- Package
- SOT-89
- Pins
- 3
- Source
- An older or alternative marking, from a published code list
Is it dead? The meter test is below: NPN transistor.
BCX5516TASOT-89NPN transistor, 3 pins, Diodes IncorporatedNPN transistorSOT-893 pinsDiodes Incorporated
- What it is
- NPN transistor
- Maker
- Diodes Incorporated
- Package
- SOT-89
- Pins
- 3
- Source
- Published code list
Is it dead? The meter test is below: NPN transistor.
BD4731GSOT-23-5Voltage supervisor, 5 pins, ROHMVoltage supervisorSOT-23-55 pinsROHM
- What it is
- Voltage supervisor
- Maker
- ROHM
- Package
- SOT-23-5
- Pins
- 5
- Details
- Lin/Digi-IC: Voltage Detector 3,1V, -Reset Open collector output
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
BG427SOT-3434 pins, InfineonNot recordedSOT-3434 pinsInfineon
- What it is
- Not recorded
- Maker
- Infineon
- Package
- SOT-343
- Pins
- 4
- Details
- MMIC amp 18 dB @1.8GHz
- Source
- Published code list
Is it dead? The meter test is below: RF amplifier.
BGA312SOT-1434 pins, InfineonNot recordedSOT-1434 pinsInfineon
- What it is
- Not recorded
- Maker
- Infineon
- Package
- SOT-143
- Pins
- 4
- Details
- MMIC amp 11dB @1GHz
- Source
- Published code list
Is it dead? The meter test is below: RF amplifier.
2 more parts have no package on record
BD48E46GVoltage 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.
BD48K46GVoltage 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.
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.
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.
Load switch
Voltage, board powered, black probe on ground.
Working, it reads
Switched on, the output pin sits at the input voltage. Switched off, it sits near 0 V.
Dead, it reads
- Output at the input voltage while switched off: the pass element has shorted.
- Input present and switched on, no output: failed open, or shut down into a shorted load. Power off and measure output to ground.
- On the board:
- An output near 0 Ω to ground is usually the load. Lift the output pin to see which.
- 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 pinout and whether the enable is active high or low differ between parts. The datasheet gives both.
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.
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.
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.
RF amplifier
Voltage, board powered, on the output pin that the bias resistor or choke feeds.
Working, it reads
The output pin sits at the device voltage the datasheet gives, a few volts, below the supply.
Dead, it reads
- Output pin at 0 V, or near 0 Ω to ground with the power off: shorted inside.
- Output pin at the full supply voltage: open inside, no current flowing.
- On the board:
- Measured on the board with power on; the bias network is part of the reading.
- 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 figures depend on the part and its bias resistor. The datasheet gives both.
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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