SMD code LAp
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, p, is lower case, which on NXP and Philips parts is a date or factory code, so it was set aside and LA was searched.
101 parts are printed LAp
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.
AX6605ACASOT-23-6LDO regulator, 6 pins, AXElite TechnologyLDO regulatorSOT-23-66 pinsAXElite Technology
- What it is
- LDO regulator
- Maker
- AXElite Technology
- Package
- SOT-23-6
- Pins
- 6
- Details
- Linear voltage regulator IC: LDO, Dual out., Vo1/Vo2=1.5V/2.8V±2%, 200mA, +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
BF550SOT-233 pins, SilNot recordedSOT-233 pinsSil
- What it is
- Not recorded
- Maker
- Sil
- Package
- SOT-23
- Pins
- 3
- Details
- Si-pnp: HF/AF, 40V, 25mA, 200mW, B=50..125, 350MHz
- Source
- Published code list
Is it dead? The meter test is below: This part.
BF1201SOT-1434 pins, NXPNot recordedSOT-1434 pinsNXP
- What it is
- Not recorded
- Maker
- NXP
- Package
- SOT-143
- Pins
- 4
- Details
- n-MOS*-e: 2-Gate, VHF, UHF, 10V, 30mA, 200mW
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
BU4941FP3SOT-89Voltage supervisor, 3 pins, ROHMVoltage supervisorSOT-893 pinsROHM
- What it is
- Voltage supervisor
- Maker
- ROHM
- Package
- SOT-89
- Pins
- 3
- Details
- Voltage detector IC: 4.1V±1%, +Reset PPO
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
ELM7341NAC1ASOT-343Voltage supervisor, 4 pins, ELM TechnologyVoltage supervisorSOT-3434 pinsELM Technology
- What it is
- Voltage supervisor
- Maker
- ELM Technology
- Package
- SOT-343
- Pins
- 4
- Details
- Voltage detector IC: 4.1V+1.2%, -Reset ODO
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
ELM7341NBC1ASOT-353Voltage supervisor, 5 pins, ELM TechnologyVoltage supervisorSOT-3535 pinsELM Technology
- What it is
- Voltage supervisor
- Maker
- ELM Technology
- Package
- SOT-353
- Pins
- 5
- Details
- Voltage detector IC: 4.1V±1.2%, -Reset ODO, -MR
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
ELM7630HDBSOT-23Voltage supervisor, 3 pins, ELM TechnologyVoltage supervisorSOT-233 pinsELM Technology
- What it is
- Voltage supervisor
- Maker
- ELM Technology
- Package
- SOT-23
- Pins
- 3
- Details
- Voltage detector IC: 3.0V±2%, +Reset PPO, Rdt=50ms
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
ELM99203BSOT-89-5LDO regulator, 5 pins, ELM TechnologyLDO regulatorSOT-89-55 pinsELM Technology
- What it is
- LDO regulator
- Maker
- ELM Technology
- Package
- SOT-89-5
- Pins
- 5
- Details
- Linear voltage regulator IC: LDO, 2.0V±2%, 300mA, +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
7 more parts have no package on record
B0520LW-SSchottky diode, Chip Integration TechnologySchottky diodeNot recordedNot recordedChip Integration Technology
- What it is
- Schottky diode
- Maker
- Chip Integration Technology
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Diode: SBR, 20V, 0.5A, Vf<0.385V(0.5A)
- Source
- Published code list
Is it dead? The meter test is below: Schottky diode.
B0520LW-STSchottky diode, Chip Integration TechnologySchottky diodeNot recordedNot recordedChip Integration Technology
- What it is
- Schottky diode
- Maker
- Chip Integration Technology
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Diode: SBR, 20V, 0.5A, Vf<0.385V(0.5A)
- Source
- Published code list
Is it dead? The meter test is below: Schottky diode.
BF1201WRNXPNot recordedNot recordedNot recordedNXP
- What it is
- Not recorded
- Maker
- NXP
- Package
- Not recorded
- Pins
- Not recorded
- Details
- n-MOS*-e: 2-Gate, VHF, UHF, 10V, 30mA, 200mW
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
BU4941FVoltage supervisor, ROHMVoltage supervisorNot recordedNot recordedROHM
- What it is
- Voltage supervisor
- Maker
- ROHM
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS-IC: Voltage Detector 4,1V, Reset Push-pull output
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
BU4941FWEVoltage supervisor, ROHMVoltage supervisorNot recordedNot recordedROHM
- What it is
- Voltage supervisor
- Maker
- ROHM
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS-IC: Voltage Detector 4,1V, Reset Push-pull output
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
BU4941GVoltage supervisor, ROHMVoltage supervisorNot recordedNot recordedROHM
- What it is
- Voltage supervisor
- Maker
- ROHM
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS-IC: Voltage Detector 4,1V, Reset Push-pull output
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
GDZ3.9Zener diode, ROHMZener diodeNot recordedNot recordedROHM
- What it is
- Zener diode
- Maker
- ROHM
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Zener diode: 3.74..4.16V, Izt=5mA, 100mW
- Source
- Published code list
Is it dead? The meter test is below: Zener 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.
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.
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.
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.
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.
Zener diode
Diode range for the forward check, part lifted, red probe on the anode. A bench supply for the Zener voltage.
Working, it reads
About 0.6 to 0.8 V forward and open in reverse on the diode range. Its Zener voltage shows only on a supply: feed it through a resistor that sets about 5 mA, cathode to positive, read quickly, and it should hold near its rated voltage.
Dead, it reads
- The same reading both ways round, near 0 V with a continuous beep or the same middling value: shorted.
- Open both ways, forward too: failed open.
- Holds well off its rated voltage on the supply test: drifted.
- A soft knee, or a voltage that creeps on the supply test: 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 meter's diode range stops at about 2 to 3 V, so almost every Zener reads open in reverse on it, good or bad; a 3 V meter may just show a 2.4 or 2.7 V part. Above about 3 V the meter cannot tell a Zener from a plain diode.
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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