SMD code M3p
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 M3 was searched.
182 parts are printed M3p
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.
MMSZ5258BWSSOD-323Zener diode, 2 pins, Taitron ComponentsZener diodeSOD-3232 pinsTaitron Components
- What it is
- Zener diode
- Maker
- Taitron Components
- Package
- SOD-323
- Pins
- 2
- Details
- SMD Zener Diodes (Two Terminals) - 200mW
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
S-LMSZ5258BT1GSOD-123Zener diode, 2 pins, LRCZener diodeSOD-1232 pinsLRC
- What it is
- Zener diode
- Maker
- LRC
- Package
- SOD-123
- Pins
- 2
- Details
- Zener diode, VZ Min 34.2 V, VZ Nom 36 V, VZ Max 37.8 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
TM3SMARectifier, 2 pins, Galaxy MicroelectronicsRectifierSMA2 pinsGalaxy Microelectronics
- What it is
- Rectifier
- Maker
- Galaxy Microelectronics
- Package
- SMA
- Pins
- 2
- Details
- 1A, 200V, Surface Mount Standard Recovery Rectifiers
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
TMMSZ5258ASOD-123Zener diode, 2 pins, Galaxy MicroelectronicsZener diodeSOD-1232 pinsGalaxy Microelectronics
- What it is
- Zener diode
- Maker
- Galaxy Microelectronics
- Package
- SOD-123
- Pins
- 2
- Details
- 36V, 500mW, Surface Mount Zener Diodes
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
TMMSZ5258ASSOD-323Zener diode, 2 pins, Galaxy MicroelectronicsZener diodeSOD-3232 pinsGalaxy Microelectronics
- What it is
- Zener diode
- Maker
- Galaxy Microelectronics
- Package
- SOD-323
- Pins
- 2
- Details
- 36V, 200mW, Surface Mount Zener Diodes
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
TMMSZ5258BSOD-123Zener diode, 2 pins, Galaxy MicroelectronicsZener diodeSOD-1232 pinsGalaxy Microelectronics
- What it is
- Zener diode
- Maker
- Galaxy Microelectronics
- Package
- SOD-123
- Pins
- 2
- Details
- 36V, 500mW, Surface Mount Zener Diodes
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
ZD5258AS2SOD-323Zener diode, 2 pins, CYStekZener diodeSOD-3232 pinsCYStek
- What it is
- Zener diode
- Maker
- CYStek
- Package
- SOD-323
- Pins
- 2
- Details
- 36 V zener diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
ZD5258ASHSOD-123Zener diode, 2 pins, CYStekZener diodeSOD-1232 pinsCYStek
- What it is
- Zener diode
- Maker
- CYStek
- Package
- SOD-123
- Pins
- 2
- Details
- 36 V zener diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
ZD5258BS2SOD-323Zener diode, 2 pins, CYStekZener diodeSOD-3232 pinsCYStek
- What it is
- Zener diode
- Maker
- CYStek
- Package
- SOD-323
- Pins
- 2
- Details
- 36 V zener diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
ZD5258BSHSOD-123Zener diode, 2 pins, CYStekZener diodeSOD-1232 pinsCYStek
- What it is
- Zener diode
- Maker
- CYStek
- Package
- SOD-123
- Pins
- 2
- Details
- 36 V zener diode
- 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-M3SOT-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=70..140, 180MHz
- Source
- Published code list
Is it dead? The meter test is below: This part.
3 more parts have no package on record
NX3L1T384GMAnalog switch, 6 pins, NXPAnalog switchNot recorded6 pinsNXP
- What it is
- Analog switch
- Maker
- NXP
- Package
- Not recorded
- Pins
- 6
- Details
- Low-ohmic single-pole single-throw analog switch
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Integrated circuit.
WRM3Schottky diode, WayonSchottky diodeNot recordedNot recordedWayon
- What it is
- Schottky diode
- Maker
- Wayon
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
2SA812-3PNP 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=70..140, 180MHz
- Source
- Published code list
Is it dead? The meter test is below: PNP transistor.
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.
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.
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.
Schottky diode
Diode range, part lifted or one leg off the pad. Red probe on the anode.
Working, it reads
About 0.15 to 0.45 V anode to cathode, roughly half a silicon diode, and open the other way.
Dead, it reads
- The same reading both ways round, near 0 V with a continuous beep or the same middling value: shorted.
- A reading the wrong way round as well: leaky.
- Open both ways: failed open.
- 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 large Schottky can read about 0.1 V forward and beep like a short, and leaks a little the wrong way when good, more when warm. It is shorted only if it reads the same both ways. Measure it cold, beside an identical cold one.
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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