SMD code S1p
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 S1 was searched.
79 parts are printed S1p
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.
LD6919GU-15SOT-363LDO regulator, 6 pins, LeadtrendLDO regulatorSOT-3636 pinsLeadtrend
- What it is
- LDO regulator
- Maker
- Leadtrend
- Package
- SOT-363
- Pins
- 6
- Details
- Linear voltage regulator IC: LDO, Ultra-LN, Soft start, 1.5V±2%, 500mA, +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
MMBT2222ASOT-23NPN transistor, 3 pins, InfineonNPN transistorSOT-233 pinsInfineon
- What it is
- NPN transistor
- Maker
- Infineon
- Package
- SOT-23
- Pins
- 3
- Details
- NPN bipolar transistor
- Source
- An older or alternative marking, from a published code list
Is it dead? The meter test is below: NPN transistor.
R1121N311BSOT-23-55 pins, Nisshinbo Micro DevicesNot recordedSOT-23-55 pinsNisshinbo Micro Devices
- What it is
- Not recorded
- Maker
- Nisshinbo Micro Devices
- Package
- SOT-23-5
- Pins
- 5
- Details
- VR-IC: LDO, LN, CE, 3.1V±2%, 150mA
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
R3116Q181CSOT-343Voltage supervisor, 4 pins, RicohVoltage supervisorSOT-3434 pinsRicoh
- What it is
- Voltage supervisor
- Maker
- Ricoh
- Package
- SOT-343
- Pins
- 4
- Details
- Voltage detector IC: 1.8V±0.8%, -Reset PPO
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
R3117K183CDFNVoltage supervisor, RicohVoltage supervisorDFNNot recordedRicoh
- What it is
- Voltage supervisor
- Maker
- Ricoh
- Package
- DFN
- Pins
- Not recorded
- Details
- Voltage detector IC: 1.8V±1%, -Reset PPO, Sense
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
R3130N44DASOT-233 pins, Nisshinbo Micro DevicesNot recordedSOT-233 pinsNisshinbo Micro Devices
- What it is
- Not recorded
- Maker
- Nisshinbo Micro Devices
- Package
- SOT-23
- Pins
- 3
- Details
- CMOS-IC: Voltage Detector 4,4V, -Reset Push-pull output, 200ms
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
R3134N23ECSOT-23-5Voltage supervisor, 5 pins, RicohVoltage supervisorSOT-23-55 pinsRicoh
- What it is
- Voltage supervisor
- Maker
- Ricoh
- Package
- SOT-23-5
- Pins
- 5
- Details
- Voltage detector IC: 2.3V±1.8%, -Reset PPO, -MR
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
RP104Q281D5SOT-343LDO regulator, 4 pins, RicohLDO regulatorSOT-3434 pinsRicoh
- What it is
- LDO regulator
- Maker
- Ricoh
- Package
- SOT-343
- Pins
- 4
- Details
- Linear voltage regulator IC: LDO, 2.85V±0.8%, 150mA, +CE, CL
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
RP114K291DDFNLDO regulator, RicohLDO regulatorDFNNot recordedRicoh
- What it is
- LDO regulator
- Maker
- Ricoh
- Package
- DFN
- Pins
- Not recorded
- Details
- Linear voltage regulator IC: LDO, 2.9V±1%, 300mA, +CE, CL
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
SDS511QSOD-5232 pins, Kodenshi AUKNot recordedSOD-5232 pinsKodenshi AUK
- What it is
- Not recorded
- Maker
- Kodenshi AUK
- Package
- SOD-523
- Pins
- 2
- Details
- Diode
- Source
- Published code list
Is it dead? The meter test is below: Silicon diode.
SI2301SOT-23P-channel MOSFET, 3 pins, Micro Commercial ComponentsP-channel MOSFETSOT-233 pinsMicro Commercial Components
- What it is
- P-channel MOSFET
- Maker
- Micro Commercial Components
- Package
- SOT-23
- Pins
- 3
- Details
- P-channel MOSFET, 20 V
- Source
- Published code list
Is it dead? The meter test is below: P-channel MOSFET.
SMBT2222ASOT-23Transistor, 3 pins, InfineonTransistorSOT-233 pinsInfineon
- What it is
- Transistor
- Maker
- Infineon
- Package
- SOT-23
- Pins
- 3
- Source
- An older or alternative marking, from a published code list
Is it dead? The meter test is below: Bipolar transistor.
3 more parts have no package on record
R1131D111DNisshinbo Micro DevicesNot recordedNot recordedNot recordedNisshinbo Micro Devices
- What it is
- Not recorded
- Maker
- Nisshinbo Micro Devices
- Package
- Not recorded
- Pins
- Not recorded
- Details
- VR-IC: LDO, CE, auto discharge, 1.1V±2%, 300mA
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
R1225N602CNisshinbo Micro DevicesNot recordedNot recordedNot recordedNisshinbo Micro Devices
- What it is
- Not recorded
- Maker
- Nisshinbo Micro Devices
- Package
- Not recorded
- Pins
- Not recorded
- Details
- VR-IC: PWM step-down DC-DC converter, 6V, 300KHz
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
SFM11MFrontier ElectronicsNot recordedNot recordedNot recordedFrontier Electronics
- What it is
- Not recorded
- Maker
- Frontier Electronics
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Diode: Superfast rec. rectif, 50V, 1A, Vf<0.95V(1A), 35ns
- Source
- Published code list
Is it dead? The meter test is below: Silicon 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.
NPN transistor
Diode range, part lifted or its base leg off the pad.
Working, it reads
Red 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.
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.
Silicon diode
Diode range, part lifted or one leg off the pad. Red probe on the anode.
Working, it reads
About 0.5 to 0.8 V anode to cathode, and open the other way. Small switching diodes read about 0.6 to 0.7 V; large rectifiers can read a little lower.
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: failed open.
- A reading the wrong way round as well: 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 three-pin body can hold two diodes. With a common pin they read two junctions from that pin, just like a transistor; in series they read two drops end to end. Test each pair the datasheet names.
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
Diode range, part lifted. Test drain to source first, then short gate to source and test again.
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.
Bipolar transistor
Diode range, part lifted or its base leg off the pad.
Working, it reads
From the base, one probe colour 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.
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