SMD code 323 in SOT-23-6
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 in SOT-23-6 are printed 323
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Answer up to 4 quick questions and these 6 parts are ranked, with a meter test that settles it. It works on a dead part too.
TPP302083-T6TRSOT-23-6DC-DC converter, 3PEAKDC-DC converter3PEAK
- What it is
- DC-DC converter
- Maker
- 3PEAK
- Package
- SOT-23-6
- Pins
- 6
- Details
- 30-V Input, 2-A Synchronous Step-Down Voltage Regulator
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Integrated circuit.
TPP362083-T6TRSOT-23-6DC-DC converter, 3PEAKDC-DC converter3PEAK
- What it is
- DC-DC converter
- Maker
- 3PEAK
- Package
- SOT-23-6
- Pins
- 6
- Details
- 36-V Input, 2-A Synchronous Step-Down Voltage Regulator
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Integrated circuit.
ADA4432-1WBRJZ-R7SOT-23-6Analog DevicesNot recordedAnalog Devices
- What it is
- Not recorded
- Maker
- Analog Devices
- Package
- SOT-23-6
- Pins
- 6
- Source
- Published code list
Is it dead? The meter test is below: This part.
FDC6323LSOT-23-6onsemiNot recordedonsemi
- What it is
- Not recorded
- Maker
- onsemi
- Package
- SOT-23-6
- Pins
- 6
- Details
- Load switch
- Source
- Published code list
Is it dead? The meter test is below: Load switch.
2 more parts have no package on record. Nothing rules them out, so they stay.
FDMA3023PZDual P-channel MOSFET, onsemiDual P-channel MOSFETonsemi
- What it is
- Dual P-channel MOSFET
- Maker
- onsemi
- Package
- Not recorded
- Pins
- Not recorded
- Details
- MOSFET - Dual, P-Channel, POWERTRENCH
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: P-channel MOSFET pair.
TCK323GLoad switch, ToshibaLoad switchToshiba
- What it is
- Load switch
- Maker
- Toshiba
- Package
- Not recorded
- Pins
- Not recorded
- Details
- 36 V, Dual Inputs - Single Output Power Multiplexer IC with Over Voltage Protection
- Source
- Manufacturer datasheet
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.
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.
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.
P-channel MOSFET pair
Diode range, part lifted. Test drain to source first, then short gate to source and test again. Test each MOSFET on its own pins, as the datasheet's pinout gives them.
Working, it reads
Red probe on the drain, black on the source: about 0.4 to 0.9 V, the body diode. Open the other way. The gate reads open to both other pins, both ways.
Dead, it reads
- Drain to source the same both ways, near 0 V with a continuous beep, and still so after shorting gate to source: shorted. The classic failure.
- The gate reads low to source or drain: gate shorted. Often all three pins end up shorted together.
- No body diode at all: failed open.
- On the board
- the gate usually has a resistor to the source, so gate to source reads that resistor, which is not a fault. Lift a leg to be sure.
- 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 diode range can charge the gate enough to turn the part on, and then drain to source reads near 0 both ways on a good part. Short gate to source and test again before you condemn it.
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 323
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 323
For a marking with its end worn or burnt off. Each code has a page of its own.
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