SMD code GC4
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.
4 parts are printed GC4
Not sure which one you have?
Answer up to 4 quick questions and these 4 parts are ranked, with a meter test that settles it. It works on a dead part too.
FR9208S9SOT-23-6DC-DC converter, 6 pins, FitipowerDC-DC converterSOT-23-66 pinsFitipower
- What it is
- DC-DC converter
- Maker
- Fitipower
- Package
- SOT-23-6
- Pins
- 6
- Details
- 18V, 5A Synchronous Step-Down DC/DC Converter Applications 機頂盒
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Integrated circuit.
AZ809NTTRSOT-233 pins, Diodes IncorporatedNot recordedSOT-233 pinsDiodes Incorporated
- What it is
- Not recorded
- Maker
- Diodes Incorporated
- Package
- SOT-23
- Pins
- 3
- Details
- uP reset cct 3.08V threshold, active low
- Source
- Published code list
Is it dead? The meter test is below: This part.
STPS1L40USMB2 pins, STMicroelectronicsNot recordedSMB2 pinsSTMicroelectronics
- What it is
- Not recorded
- Maker
- STMicroelectronics
- Package
- SMB
- Pins
- 2
- Source
- Published code list
Is it dead? The meter test is below: This part.
STPS1L140USMBSchottky diode, 2 pins, SGS-Thomson MicroelectronicsSchottky diodeSMB2 pinsSGS-Thomson Microelectronics
- What it is
- Schottky diode
- Maker
- SGS-Thomson Microelectronics
- Package
- SMB
- Pins
- 2
- Details
- Diode: SBR, 40V, 1A, Vf<0.42V(1A)
- Source
- Published code list
Is it dead? The meter test is below: Schottky 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.
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.
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.
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.
Printed with a code easy to misread as GC4
One character differs, and it is one that is easy to confuse under a lamp. Each code has a page of its own.
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