SMD code GA3

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.

7 parts are printed GA3

Not sure which one you have?

Answer up to 4 quick questions and these 7 parts are ranked, with a meter test that settles it. It works on a dead part too.

2SA1871-3SOT-893 pins, NEC ElectronicsNot recordedSOT-893 pinsNEC Electronics
What it is
Not recorded
Maker
NEC Electronics
Package
SOT-89
Pins
3
Details
Si-pnp: HF, HV, 600V, 1A, 2W, 30MHz, B=60..120
Source
Published code list
Is it dead? The meter test is below: This part.
AP2138N-1.2TRG1SOT-23LDO regulator, 3 pins, Diodes IncorporatedLDO regulatorSOT-233 pinsDiodes Incorporated
What it is
LDO regulator
Maker
Diodes Incorporated
Package
SOT-23
Pins
3
Details
Linear voltage regulator IC: LDO, 1.2V±2%, 250mA
Source
Published code list
Is it dead? The meter test is below: Voltage regulator.
LM4902LDDFNNational SemiconductorNot recordedDFNNot recordedNational Semiconductor
What it is
Not recorded
Maker
National Semiconductor
Package
DFN
Pins
Not recorded
Details
Lin-IC: AF PA, BTL, 2,2..5,5V, 265mW(5V/8Ω), shutdown
Source
Published code list
Is it dead? The meter test is below: Integrated circuit.
4 more parts have no package on record
- 2SA1871GA33 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.
- LM4889ITLNational SemiconductorNot recordedNot recordedNot recordedNational Semiconductor
  What it is
  Not recorded
  Maker
  National Semiconductor
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Lin-IC: AF PA, BTL, 2,7..5,5V, 1W(5V/8Ω), shutdown
  Source
  Published code list
  Is it dead? The meter test is below: Integrated circuit.
- LM4889ITLXTexas InstrumentsNot recordedNot recordedNot recordedTexas Instruments
  What it is
  Not recorded
  Maker
  Texas Instruments
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Lin-IC: AF PA, BTL, 2,7..5,5V, 1W(5V/8Ω), shutdown
  Source
  Published code list
  Is it dead? The meter test is below: Integrated circuit.
- LM4911MMNational SemiconductorNot recordedNot recordedNot recordedNational Semiconductor
  What it is
  Not recorded
  Maker
  National Semiconductor
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Lin-IC: 2xAF PA, BTL, 2,2..5,5V, 40mW(5V/16Ω), shutdown
  Source
  Published code list
  Is it dead? The meter test is below: Integrated circuit.

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.

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.

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.

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 GA3

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 GA3

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 66 more parts.

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