SMD code M05
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.
M05 on a chip resistor
50 kΩ
50 kΩ resistor
The M is both the decimal point and the multiplier: 50 kΩ.
Check it with a meter
Lift one end and measure across it. A good one reads 50 kΩ. Measuring it in circuit reads the parallel combination of everything around it, which is almost always lower, never higher: well above 50 kΩ on the board is a fault. Open, or well above 50 kΩ, means it has failed: burnt, cracked or corroded. That does not change what to fit: the marking still says 50 kΩ. A burnt resistor usually means the part it feeds drew too much, so find that before fitting a new one.
On a transistor or diode body (SOT-89, USP-6C, SOT-23), M05 is a part code instead. Those parts are listed below.
21 parts are printed M05
Not sure which one you have?
Answer up to 4 quick questions and these 21 parts are ranked, with a meter test that settles it. It works on a dead part too.
CPDT-5V0UB-HFSOT-23ESD protection diode, 3 pins, ComchipESD protection diodeSOT-233 pinsComchip
- What it is
- ESD protection diode
- Maker
- Comchip
- Package
- SOT-23
- Pins
- 3
- Details
- 5 V unidirectional ESD protection diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
FM405SMARectifier, 2 pins, LRCRectifierSMA2 pinsLRC
- What it is
- Rectifier
- Maker
- LRC
- Package
- SMA
- Pins
- 2
- Details
- Rectifier, VPK 600 V, IO @ TL 1 A, TL@°C 75
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
FMAF405SMAFRectifier, 2 pins, LRCRectifierSMAF2 pinsLRC
- What it is
- Rectifier
- Maker
- LRC
- Package
- SMAF
- Pins
- 2
- Details
- Rectifier, VPK 600 V, IO @ TL 1 A, TL@°C 75
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
S-FM405SMARectifier, 2 pins, LRCRectifierSMA2 pinsLRC
- What it is
- Rectifier
- Maker
- LRC
- Package
- SMA
- Pins
- 2
- Details
- Rectifier, VPK 600 V, IO @ TL 1 A, TL@°C 75
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
SM05SOT-23ESD protection diode, 3 pins, Galaxy MicroelectronicsESD protection diodeSOT-233 pinsGalaxy Microelectronics
- What it is
- ESD protection diode
- Maker
- Galaxy Microelectronics
- Package
- SOT-23
- Pins
- 3
- Details
- 5V, 300W, Surface Mount TVS
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
SM05-02HTGSOT-23TVS diode, 3 pins, UMWTVS diodeSOT-233 pinsUMW
- What it is
- TVS diode
- Maker
- UMW
- Package
- SOT-23
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
SM05.TCTSOT-23ESD protection diode, 3 pins, UMWESD protection diodeSOT-233 pinsUMW
- What it is
- ESD protection diode
- Maker
- UMW
- Package
- SOT-23
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
SM05T1GSOT-23ESD protection diode, 3 pins, DOWOESD protection diodeSOT-233 pinsDOWO
- What it is
- ESD protection diode
- Maker
- DOWO
- Package
- SOT-23
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
TEPM05SOT-23ESD protection diode, 3 pins, RectronESD protection diodeSOT-233 pinsRectron
- What it is
- ESD protection diode
- Maker
- Rectron
- Package
- SOT-23
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
TSM05SOT-23ESD protection diode, 3 pins, Galaxy MicroelectronicsESD protection diodeSOT-233 pinsGalaxy Microelectronics
- What it is
- ESD protection diode
- Maker
- Galaxy Microelectronics
- Package
- SOT-23
- Pins
- 3
- Details
- 5V, 300W, Surface Mount TVS
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
ADM803TAKSSOT-3233 pins, Analog DevicesNot recordedSOT-3233 pinsAnalog Devices
- What it is
- Not recorded
- Maker
- Analog Devices
- Package
- SOT-323
- Pins
- 3
- Source
- Published code list
Is it dead? The meter test is below: This part.
LN61FN2012MSOT-23Voltage supervisor, 3 pins, Shanghai Natlinear ElectronicsVoltage supervisorSOT-233 pinsShanghai Natlinear Electronics
- What it is
- Voltage supervisor
- Maker
- Shanghai Natlinear Electronics
- Package
- SOT-23
- Pins
- 3
- Details
- Voltage detector IC: 2.0V±2%, +Reset ODO, Rdt=200ms
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
3 more parts have no package on record
CFM405Rectifier, LRCRectifierNot recordedNot recordedLRC
- What it is
- Rectifier
- Maker
- LRC
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Rectifier, VPK 600 V, IO @ TL 1 A, TL@°C 75
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
S-CFM405Rectifier, LRCRectifierNot recordedNot recordedLRC
- What it is
- Rectifier
- Maker
- LRC
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Rectifier, VPK 600 V, IO @ TL 1 A, TL@°C 75
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
S-CFM405-SRectifier, LRCRectifierNot recordedNot recordedLRC
- What it is
- Rectifier
- Maker
- LRC
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Rectifier, VPK 600 V, IO @ TL 1 A, TL@°C 75
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
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.
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.
TVS or ESD protection diode
Diode range, from the protected line to ground, part lifted if you can.
Working, it reads
A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.
Dead, it reads
- From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
- A reading both ways on a one-way part: leaky.
- A one-way part open both ways: failed open.
- On the board
- , a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
- Compare:
- The same part on the next line or connector pin is the healthy reading to compare with.
- Watch for:
- A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.
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.
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.
Printed with a code easy to misread as M05
One character differs, and it is one that is easy to confuse under a lamp. Each code has a page of its own.
Codes that begin with M05
For a marking with its end worn or burnt off. Each code has a page of its own.
Codes not listed here are printed on 80 more parts.
Did you find your part?
Open this in the search to correct a character or try another package.