SMD code 3Mt
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, t, is lower case, which on NXP and Philips parts is a date or factory code, so it was set aside and 3M was searched.
71 parts are printed 3Mt
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.
EC8803-30B6LG1SOT-89LDO regulator, 3 pins, E-CMOSLDO regulatorSOT-893 pinsE-CMOS
- What it is
- LDO regulator
- Maker
- E-CMOS
- Package
- SOT-89
- Pins
- 3
- Details
- Linear voltage regulator IC: LDO, 3.0V±1%, 300mA
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
EC8803-30B6LG2SOT-89LDO regulator, 3 pins, E-CMOSLDO regulatorSOT-893 pinsE-CMOS
- What it is
- LDO regulator
- Maker
- E-CMOS
- Package
- SOT-89
- Pins
- 3
- Details
- Linear voltage regulator IC: LDO, 3.0V±2%, 300mA
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
FMMT5087RSOT-233 pins, Diodes IncorporatedNot recordedSOT-233 pinsDiodes Incorporated
- What it is
- Not recorded
- Maker
- Diodes Incorporated
- Package
- SOT-23
- Pins
- 3
- Details
- 2N5087 BC322
- Source
- Published code list
Is it dead? The meter test is below: This part.
FRS1KWSOD-123W2 pins, Fagor ElectronicaNot recordedSOD-123W2 pinsFagor Electronica
- What it is
- Not recorded
- Maker
- Fagor Electronica
- Package
- SOD-123W
- Pins
- 2
- Details
- Diode: Fast recov. rectif, 800V, 0.8A, Vf<1.3V(0.8A), <500ns
- Source
- Published code list
Is it dead? The meter test is below: Silicon diode.
IMP161MEUSSOT-143Voltage supervisor, 4 pins, IMPVoltage supervisorSOT-1434 pinsIMP
- What it is
- Voltage supervisor
- Maker
- IMP
- Package
- SOT-143
- Pins
- 4
- Details
- Voltage detector IC: 4.38V±1.5%, -Reset ODO, -MR
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
MM3Z100SOD-323Zener diode, 2 pins, Luguang Electronic TechnologyZener diodeSOD-3232 pinsLuguang Electronic Technology
- What it is
- Zener diode
- Maker
- Luguang Electronic Technology
- Package
- SOD-323
- Pins
- 2
- Details
- Zener diode: 94..106V, Izt=1mA, Zzt=700, 300mW
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
MMBT5210SOT-233 pins, Fairchild SemiconductorNot recordedSOT-233 pinsFairchild Semiconductor
- What it is
- Not recorded
- Maker
- Fairchild Semiconductor
- Package
- SOT-23
- Pins
- 3
- Details
- General purpose NPN Transistor
- Source
- Published code list
Is it dead? The meter test is below: Bipolar transistor.
NSF2250WT1SOT-323RF transistor, 3 pins, onsemiRF transistorSOT-3233 pinsonsemi
- What it is
- RF transistor
- Maker
- onsemi
- Package
- SOT-323
- Pins
- 3
- Details
- Si-npn: VHF/UHF Osc/Mix, 30V, 50mA, 0,2W, B=150..250, 2.3GHz
- Source
- Published code list
Is it dead? The meter test is below: Bipolar transistor.
PT7M823SSESOT-353Voltage supervisor, 5 pins, Diodes IncorporatedVoltage supervisorSOT-3535 pinsDiodes Incorporated
- What it is
- Voltage supervisor
- Maker
- Diodes Incorporated
- Package
- SOT-353
- Pins
- 5
- Details
- Voltage detector IC: 2.93V±1%, -Reset PPO, -MR, WD
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
R3111N431CSOT-23-55 pins, Nisshinbo Micro DevicesNot recordedSOT-23-55 pinsNisshinbo Micro Devices
- What it is
- Not recorded
- Maker
- Nisshinbo Micro Devices
- Package
- SOT-23-5
- Pins
- 5
- Details
- CMOS-IC: Voltage Detector 4,3V±2.0%, Reset Open drain output
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
5 more parts have no package on record
EC8803-30T1NG1LDO regulator, E-CMOSLDO regulatorNot recordedNot recordedE-CMOS
- What it is
- LDO regulator
- Maker
- E-CMOS
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Linear voltage regulator IC: LDO, 3.0V±1%, 300mA
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
EC8803-30T1NG2LDO regulator, E-CMOSLDO regulatorNot recordedNot recordedE-CMOS
- What it is
- LDO regulator
- Maker
- E-CMOS
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Linear voltage regulator IC: LDO, 3.0V±2%, 300mA
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
IXD5126N15ANR-GVoltage supervisor, IXYSVoltage supervisorNot recordedNot recordedIXYS
- What it is
- Voltage supervisor
- Maker
- IXYS
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 1.5V±0.8%, -Reset ODO
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
IXD5127N33DNRVoltage supervisor, IXYSVoltage supervisorNot recordedNot recordedIXYS
- What it is
- Voltage supervisor
- Maker
- IXYS
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 3.3V±0.8%, -Reset ODO, -MR, 400ms Rt delay
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
R1161D331DNisshinbo Micro DevicesNot recordedNot recordedNot recordedNisshinbo Micro Devices
- What it is
- Not recorded
- Maker
- Nisshinbo Micro Devices
- Package
- Not recorded
- Pins
- Not recorded
- Details
- VR-IC: LDO, CE, auto discharge, 3.3V±2%, 350mA
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
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.
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.
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.
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.
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.
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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