SMD code M4p
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 M4 was searched.
193 parts are printed M4p
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.
ZD5259ASHSOD-123Zener diode, 2 pins, CYStekZener diodeSOD-1232 pinsCYStek
- What it is
- Zener diode
- Maker
- CYStek
- Package
- SOD-123
- Pins
- 2
- Details
- 39 V zener diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
ZD5259BS2SOD-323Zener diode, 2 pins, CYStekZener diodeSOD-3232 pinsCYStek
- What it is
- Zener diode
- Maker
- CYStek
- Package
- SOD-323
- Pins
- 2
- Details
- 39 V zener diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
ZD5259BSHSOD-123Zener diode, 2 pins, CYStekZener diodeSOD-1232 pinsCYStek
- What it is
- Zener diode
- Maker
- CYStek
- Package
- SOD-123
- Pins
- 2
- Details
- 39 V zener diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
ZT52B4V7SOD-123Zener diode, 2 pins, YFWZener diodeSOD-1232 pinsYFW
- What it is
- Zener diode
- Maker
- YFW
- Package
- SOD-123
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
2SA812SOT-23PNP transistor, 3 pinsPNP transistorSOT-233 pinsNot recorded
- What it is
- PNP transistor
- Maker
- Not recorded
- Package
- SOT-23
- Pins
- 3
- Details
- PNP bipolar transistor
- Source
- Published code list
Is it dead? The meter test is below: PNP transistor.
2SA812-M4SOT-233 pins, RenesasNot recordedSOT-233 pinsRenesas
- What it is
- Not recorded
- Maker
- Renesas
- Package
- SOT-23
- Pins
- 3
- Details
- Si-pnp: GP, AF, 60V, 100mA, 200mW, B=90..180, 180MHz
- Source
- Published code list
Is it dead? The meter test is below: This part.
2SA812A-M4SOT-233 pins, RenesasNot recordedSOT-233 pinsRenesas
- What it is
- Not recorded
- Maker
- Renesas
- Package
- SOT-23
- Pins
- 3
- Details
- Si-pnp: GP, AF, 60V, 100mA, 200mW, B=90..180, 180MHz
- Source
- Published code list
Is it dead? The meter test is below: This part.
2SA812M4SOT-233 pins, RenesasNot recordedSOT-233 pinsRenesas
- What it is
- Not recorded
- Maker
- Renesas
- Package
- SOT-23
- Pins
- 3
- Source
- Published code list
Is it dead? The meter test is below: This part.
2SA1611SOT-323PNP transistor, 3 pins, Galaxy MicroelectronicsPNP transistorSOT-3233 pinsGalaxy Microelectronics
- What it is
- PNP transistor
- Maker
- Galaxy Microelectronics
- Package
- SOT-323
- Pins
- 3
- Source
- Published code list
Is it dead? The meter test is below: PNP transistor.
2SA1611-4SOT-3233 pins, NEC ElectronicsNot recordedSOT-3233 pinsNEC Electronics
- What it is
- Not recorded
- Maker
- NEC Electronics
- Package
- SOT-323
- Pins
- 3
- Details
- Si-pnp: AF, 60V, 100mA, 150mW, B=90..180, 180MHz
- Source
- Published code list
Is it dead? The meter test is below: This part.
5 more parts have no package on record
2SA812-4PNP transistor, NEC ElectronicsPNP transistorNot recordedNot recordedNEC Electronics
- What it is
- PNP transistor
- Maker
- NEC Electronics
- Package
- Not recorded
- Pins
- Not recorded
- Details
- PNP transistor: GP, AF, 60V, 100mA, 200mW, B=90..180, 180MHz
- Source
- Published code list
Is it dead? The meter test is below: PNP transistor.
2SA812A-4PNP transistor, NEC ElectronicsPNP transistorNot recordedNot recordedNEC Electronics
- What it is
- PNP transistor
- Maker
- NEC Electronics
- Package
- Not recorded
- Pins
- Not recorded
- Details
- PNP transistor: GP, AF, 60V, 100mA, 200mW, B=90..180, 180MHz
- Source
- Published code list
Is it dead? The meter test is below: PNP transistor.
2SA812AM43 pins, RenesasNot recordedNot recorded3 pinsRenesas
- What it is
- Not recorded
- Maker
- Renesas
- Package
- Not recorded
- Pins
- 3
- Source
- Published code list
Is it dead? The meter test is below: This part.
2SA1179-4PNP transistor, Sanyo ElectricPNP transistorNot recordedNot recordedSanyo Electric
- What it is
- PNP transistor
- Maker
- Sanyo Electric
- Package
- Not recorded
- Pins
- Not recorded
- Details
- PNP transistor: GP, AF, 55V, 150mA, 200mW, B=90..180, 180MHz
- Source
- Published code list
Is it dead? The meter test is below: PNP transistor.
2SA1179-M4onsemiNot recordedNot recordedNot recordedonsemi
- What it is
- Not recorded
- Maker
- onsemi
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Si-pnp: GP, AF, 55V, 150mA, 200mW, B=90..180, 180MHz
- 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.
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.
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.
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