SMD code GM2
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.
2 parts are printed GM2
Not sure which one you have?
Answer up to 4 quick questions and these 2 parts are ranked, with a meter test that settles it. It works on a dead part too.
FP6805-46AS7Voltage supervisor, 3 pins, FitipowerVoltage supervisor3 pinsFitipower
- What it is
- Voltage supervisor
- Maker
- Fitipower
- Package
- Not recorded
- Pins
- 3
- Details
- Microprocessor Reset Circuits With Adjustable Delay Time
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Integrated circuit.
LM48557TLNational SemiconductorNot recordedNot recordedNational Semiconductor
- What it is
- Not recorded
- Maker
- National Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Linear IC: APA, BTL, 2.6..5.5V, 15.6Vp-p, ceramic speaker, I2C control
- Source
- Published code list
Is it dead? The meter test is below: Ceramic capacitor.
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.
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.
Ceramic capacitor
Ohms range across it, and a capacitance range with it lifted.
Working, it reads
On the ohms range it reads open, or climbs to open as it charges. Lifted, a capacitance range reads close to its value.
Dead, it reads
- Near 0 Ω, or a few ohms: shorted. The usual failure, often from a crack caused by board flex or heat, and it can come and go.
- A steady resistance, kilohms rather than open: cracked and leaking.
- Lifted, far below its value on a capacitance range: cracked open or drifted. Less common than a short, but it happens.
- On the board
- a shorted capacitor shorts its whole rail, so every capacitor on that rail reads the same short. Lift one end, or feed the rail from a current-limited supply and feel which part warms up.
- Compare:
- Chip capacitors are mostly unmarked, so the value comes from the schematic or the same position on a working board.
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 GM2
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 GM2
For a marking with its end worn or burnt off. Each code has a page of its own.
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