SMD code MAp
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 MA was searched.
89 parts are printed MAp
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.
NCV8164ASN120SOT-23-5LDO regulator, 5 pins, onsemiLDO regulatorSOT-23-55 pinsonsemi
- What it is
- LDO regulator
- Maker
- onsemi
- Package
- SOT-23-5
- Pins
- 5
- Details
- LDO Regulator, 300 mA, Low Dropout Voltage, Ultra Low Noise, High PSRR with Power Good
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Voltage regulator.
NL27WZ14DBVSOT-23-6Logic gate, 6 pins, onsemiLogic gateSOT-23-66 pinsonsemi
- What it is
- Logic gate
- Maker
- onsemi
- Package
- SOT-23-6
- Pins
- 6
- Details
- Dual Schmitt-Trigger Inverter
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Integrated circuit.
NL27WZ14DFSOT-363Logic gate, 6 pins, onsemiLogic gateSOT-3636 pinsonsemi
- What it is
- Logic gate
- Maker
- onsemi
- Package
- SOT-363
- Pins
- 6
- Details
- Dual Schmitt-Trigger Inverter
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Integrated circuit.
NL27WZ14DFT2G-QSOT-363Logic gate, 6 pins, onsemiLogic gateSOT-3636 pinsonsemi
- What it is
- Logic gate
- Maker
- onsemi
- Package
- SOT-363
- Pins
- 6
- Details
- Dual Schmitt-Trigger Inverter
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Integrated circuit.
S-LMBT3904DW1T1GSOT-363NPN transistor, 6 pins, LRCNPN transistorSOT-3636 pinsLRC
- What it is
- NPN transistor
- Maker
- LRC
- Package
- SOT-363
- Pins
- 6
- Details
- Bipolar transistor, NPN, IC 200 mA, VCEO 40 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
HBN2412C6SOT-563Dual NPN transistor, 6 pins, CYStekDual NPN transistorSOT-5636 pinsCYStek
- What it is
- Dual NPN transistor
- Maker
- CYStek
- Package
- SOT-563
- Pins
- 6
- Details
- 50 V, 0.2 A dual NPN transistor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor pair.
HBN2412S6RSOT-363Dual NPN transistor, 6 pins, CYStekDual NPN transistorSOT-3636 pinsCYStek
- What it is
- Dual NPN transistor
- Maker
- CYStek
- Package
- SOT-363
- Pins
- 6
- Details
- 50 V, 0.2 A dual NPN transistor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor pair.
HBN3904S6RSOT-363Dual NPN transistor, 6 pins, CYStekDual NPN transistorSOT-3636 pinsCYStek
- What it is
- Dual NPN transistor
- Maker
- CYStek
- Package
- SOT-363
- Pins
- 6
- Details
- 40 V, 0.2 A dual NPN transistor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor pair.
1N60PWSSOD-3232 pins, Semtech ElectronicsNot recordedSOD-3232 pinsSemtech Electronics
- What it is
- Not recorded
- Maker
- Semtech Electronics
- Package
- SOD-323
- Pins
- 2
- Details
- Diode: SBD, Sw, 45V, 50mA, Vf<0.45V(50mA), 1pF
- Source
- Published code list
Is it dead? The meter test is below: Silicon diode.
2N3904ESOT-523PNP transistor, 3 pins, First SilionPNP transistorSOT-5233 pinsFirst Silion
- What it is
- PNP transistor
- Maker
- First Silion
- Package
- SOT-523
- Pins
- 3
- Details
- PNP transistor: GP, 60V, 200mA, 300mW, B=100..300, >200MHz
- Source
- Published code list
Is it dead? The meter test is below: PNP transistor.
2SC3011SOT-23RF transistor, 3 pins, ToshibaRF transistorSOT-233 pinsToshiba
- What it is
- RF transistor
- Maker
- Toshiba
- Package
- SOT-23
- Pins
- 3
- Details
- Si-npn: UHF, C-Band, 20V, 30mA, 150mW, B=120, 6,5GHz
- Source
- Published code list
Is it dead? The meter test is below: Bipolar transistor.
2SC3301SOT-89RF transistor, 3 pins, ToshibaRF transistorSOT-893 pinsToshiba
- What it is
- RF transistor
- Maker
- Toshiba
- Package
- SOT-89
- Pins
- 3
- Details
- Si-npn: UHF, 15V, 80mA, 7GHz
- Source
- Published code list
Is it dead? The meter test is below: Bipolar transistor.
2SC4392SOT-323RF transistor, 3 pins, ToshibaRF transistorSOT-3233 pinsToshiba
- What it is
- RF transistor
- Maker
- Toshiba
- Package
- SOT-323
- Pins
- 3
- Details
- Si-npn: UHF, 20V, 30mA, 6.5GHz
- Source
- Published code list
Is it dead? The meter test is below: Bipolar transistor.
2 more parts have no package on record
S-LMBT3904TT1GNPN transistor, LRCNPN transistorNot recordedNot recordedLRC
- What it is
- NPN transistor
- Maker
- LRC
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Bipolar transistor, NPN, IC 200 mA, VCEO 40 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
2SC28764 pins, ToshibaNot recordedNot recorded4 pinsToshiba
- What it is
- Not recorded
- Maker
- Toshiba
- Package
- Not recorded
- Pins
- 4
- Source
- Published code list
Is it dead? The meter test is below: This part.
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.
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.
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.
NPN transistor pair
Diode range, part lifted. Test each transistor on its own pins, as the datasheet's pinout gives them.
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.
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.
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.
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.
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.
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