SMD code L12A in DFN
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 in DFN are printed L12A
Not sure which one you have?
Answer up to 4 quick questions and these 3 parts are ranked, with a meter test that settles it. It works on a dead part too.
all Anpec. What differs:
APL3212ADFNBattery protection ICBattery protection IC
- What it is
- Battery protection IC
- Maker
- Anpec
- Package
- DFN
- Pins
- Not recorded
- Details
- Li+ Charger Protection IC
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Integrated circuit.
APL3512ADFNLoad switchLoad switch
- What it is
- Load switch
- Maker
- Anpec
- Package
- DFN
- Pins
- Not recorded
- Details
- Power-Distribution Switches with Soft Start
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Load switch.
1 more part has no package on record. Nothing rules it out, so it stays.
APL3512AQBLoad switchLoad switch
- What it is
- Load switch
- Maker
- Anpec
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Power Switch
- Source
- Published code list
Is it dead? The meter test is below: Load switch.
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.
Load switch
Voltage, board powered, black probe on ground.
Working, it reads
Switched on, the output pin sits at the input voltage. Switched off, it sits near 0 V.
Dead, it reads
- Output at the input voltage while switched off: the pass element has shorted.
- Input present and switched on, no output: failed open, or shut down into a shorted load. Power off and measure output to ground.
- On the board:
- An output near 0 Ω to ground is usually the load. Lift the output pin to see which.
- Compare:
- If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
- Watch for:
- The pinout and whether the enable is active high or low differ between parts. The datasheet gives both.
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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