SMD code ALs
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.
The last letter, s, is lower case, which on NXP and Philips parts is a date or factory code, so it was set aside and AL was searched.
154 parts are printed ALs
Not sure which one you have?
Answer up to 4 quick questions and these 50 parts are ranked, with a meter test that settles it. It works on a dead part too.
GSBCX53-16SOT-89PNP transistor, 3 pins, Good-ArkPNP transistorSOT-893 pinsGood-Ark
- What it is
- PNP transistor
- Maker
- Good-Ark
- Package
- SOT-89
- Pins
- 3
- Details
- PNP transistor, 80 V, 1 A
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: PNP transistor.
NCP170AXV135SOT-563LDO regulator, 6 pins, onsemiLDO regulatorSOT-5636 pinsonsemi
- What it is
- LDO regulator
- Maker
- onsemi
- Package
- SOT-563
- Pins
- 6
- Details
- LDO Regulator - Ultra-Low I , CMOS
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Voltage regulator.
NCP173AXV135SOT-563LDO regulator, 6 pins, onsemiLDO regulatorSOT-5636 pinsonsemi
- What it is
- LDO regulator
- Maker
- onsemi
- Package
- SOT-563
- Pins
- 6
- Details
- LDO Regulator - Ultra-Low I , CMOS
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Voltage regulator.
NSR10F40NXDSN2Schottky diode, 2 pins, onsemiSchottky diodeDSN22 pinsonsemi
- What it is
- Schottky diode
- Maker
- onsemi
- Package
- DSN2
- Pins
- 2
- Details
- Schottky Barrier Diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
11 more parts have no package on record
KTK7132EMOSFET, KECMOSFETNot recordedNot recordedKEC
- What it is
- MOSFET
- Maker
- KEC
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: MOSFET.
NCP139AFCT120LDO regulator, onsemiLDO regulatorNot recordedNot recordedonsemi
- What it is
- LDO regulator
- Maker
- onsemi
- Package
- Not recorded
- Pins
- Not recorded
- Details
- LDO Regulator - Very Low Dropout, CMOS, Bias Rail
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Voltage regulator.
NCP164ASN330LDO regulator, onsemiLDO regulatorNot recordedNot recordedonsemi
- What it is
- LDO regulator
- Maker
- onsemi
- Package
- Not recorded
- Pins
- Not recorded
- Details
- LDO Regulator, 300 mA, Low Dropout Voltage, Ultra Low Noise, High PSRR with Power Good
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Voltage regulator.
NCP170AMX190LDO regulator, onsemiLDO regulatorNot recordedNot recordedonsemi
- What it is
- LDO regulator
- Maker
- onsemi
- Package
- Not recorded
- Pins
- Not recorded
- Details
- LDO Regulator - Ultra-Low I , CMOS
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Voltage regulator.
NCP308MT300Voltage supervisor, onsemiVoltage supervisorNot recordedNot recordedonsemi
- What it is
- Voltage supervisor
- Maker
- onsemi
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Low Quiescent Current, Programmable Delay Time, Supervisory Circuit
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Integrated circuit.
NCS20071XV53Operational amplifier, onsemiOperational amplifierNot recordedNot recordedonsemi
- What it is
- Operational amplifier
- Maker
- onsemi
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Operational Amplifier, - - Rail to Rail Output, 3 MHz BW
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Integrated circuit.
NCV8189CMTWADJLDO regulator, onsemiLDO regulatorNot recordedNot recordedonsemi
- What it is
- LDO regulator
- Maker
- onsemi
- Package
- Not recorded
- Pins
- Not recorded
- Details
- LDO Regulator, 0.5 A, High Accuracy (0.7%), Adjustable, Low Noise, High PSRR with Power Good
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Voltage regulator.
NCV8570BMN280LDO regulator, onsemiLDO regulatorNot recordedNot recordedonsemi
- What it is
- LDO regulator
- Maker
- onsemi
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Linear Voltage Regulator - LDO, Ultra Low Noise, High PSRR
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Voltage regulator.
NCV20071XV53Operational amplifier, onsemiOperational amplifierNot recordedNot recordedonsemi
- What it is
- Operational amplifier
- Maker
- onsemi
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Operational Amplifier, - - Rail to Rail Output, 3 MHz BW
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Integrated circuit.
NL17SZ16DBVLogic gate, onsemiLogic gateNot recordedNot recordedonsemi
- What it is
- Logic gate
- Maker
- onsemi
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Single Input Buffer
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Integrated circuit.
NLAS2750MUAnalog switch, onsemiAnalog switchNot recordedNot recordedonsemi
- What it is
- Analog switch
- Maker
- onsemi
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Low Voltage Dual SPDT Analog Switch with Negative Swing Audio Capability
- Source
- Manufacturer datasheet
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.
PNP transistor
Diode range, part lifted or its base leg off the pad.
Working, it reads
Black probe on the base reads about 0.6 to 0.75 V to the emitter and to the collector, and open the other way round. Collector to emitter reads open both ways.
Dead, it reads
- Collector to emitter the same both ways, near 0 V with a continuous beep: shorted. The commonest failure.
- The base the same both ways to another pin, near 0 V or a middling value: a shorted junction.
- Only one junction reads, or none: a junction has failed open. It then looks like a diode.
- A reading the wrong way round, where it should be open: leaky.
- 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 pair of diodes with a common pin reads just like a transistor, and some transistors carry a built-in diode or resistor. The datasheet says which.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
MOSFET
Diode range, part lifted. Test drain to source first, then short gate to source and test again.
Working, it reads
One way between drain and source reads about 0.4 to 0.9 V, the body diode, and the other way open. The gate reads open to both other pins.
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.
- No body diode at all: failed open.
- On the board
- the gate usually has a resistor to the source, which reads as that resistor and 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.
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.
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.
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