SMD code N4S
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.
13 parts are printed N4S
Not sure which one you have?
Answer up to 4 quick questions and these 13 parts are ranked, with a meter test that settles it. It works on a dead part too.
CFH400SOT-3434 pins, InfineonNot recordedSOT-3434 pinsInfineon
- What it is
- Not recorded
- Maker
- Infineon
- Package
- SOT-343
- Pins
- 4
- Details
- Pseudomorphic high electron mobility transistor: GaAs, LN, UHF, 6.5V, 80mA, 150mW, 1.8GHz, 15.7dB
- Source
- Published code list
Is it dead? The meter test is below: Bipolar transistor.
S-1131A33PDSONABLICNot recordedSONNot recordedABLIC
- What it is
- Not recorded
- Maker
- ABLIC
- Package
- SON
- Pins
- Not recorded
- Details
- VR-IC: LDO, -CE, 3.3V±1%, 300mA
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
S-1131A33UCSOT-89-55 pins, ABLICNot recordedSOT-89-55 pinsABLIC
- What it is
- Not recorded
- Maker
- ABLIC
- Package
- SOT-89-5
- Pins
- 5
- Details
- VR-IC: LDO, -CE, 3.3V±1%, 300mA
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
S-1131B33PDSONABLICNot recordedSONNot recordedABLIC
- What it is
- Not recorded
- Maker
- ABLIC
- Package
- SON
- Pins
- Not recorded
- Details
- VR-IC: LDO, CE, 3.3V±1%, 300mA
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
S-1131B33PD-N4S-TFSONLDO regulator, Seiko InstrumentsLDO regulatorSONNot recordedSeiko Instruments
- What it is
- LDO regulator
- Maker
- Seiko Instruments
- Package
- SON
- Pins
- Not recorded
- Details
- Linear voltage regulator IC: LDO, 3.3V±1%, 300mA, +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
S-1131B33UASOT-893 pins, ABLICNot recordedSOT-893 pinsABLIC
- What it is
- Not recorded
- Maker
- ABLIC
- Package
- SOT-89
- Pins
- 3
- Details
- VR-IC: LDO, 3.3V±1%, 300mA
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
S-1131B33UA-N4S-TFSOT-89LDO regulator, 3 pins, Seiko InstrumentsLDO regulatorSOT-893 pinsSeiko Instruments
- What it is
- LDO regulator
- Maker
- Seiko Instruments
- Package
- SOT-89
- Pins
- 3
- Details
- Linear voltage regulator IC: LDO, 3.3V±1%, 300mA
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
S-1131B33UA-N4STFSOT-893 pins, ABLICNot recordedSOT-893 pinsABLIC
- What it is
- Not recorded
- Maker
- ABLIC
- Package
- SOT-89
- Pins
- 3
- Details
- equivalent [3.3V LDO]
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
S-1131B33UCSOT-89-55 pins, ABLICNot recordedSOT-89-55 pinsABLIC
- What it is
- Not recorded
- Maker
- ABLIC
- Package
- SOT-89-5
- Pins
- 5
- Details
- VR-IC: LDO, CE, 3.3V±1%, 300mA
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
S-1131B33UC-N4S-TFSOT-89-5LDO regulator, 5 pins, Seiko InstrumentsLDO regulatorSOT-89-55 pinsSeiko Instruments
- What it is
- LDO regulator
- Maker
- Seiko Instruments
- Package
- SOT-89-5
- Pins
- 5
- Details
- Linear voltage regulator IC: LDO, 3.3V±1%, 300mA, +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
S-1131B33UC-N4STFSOT-89-55 pins, ABLICNot recordedSOT-89-55 pinsABLIC
- What it is
- Not recorded
- Maker
- ABLIC
- Package
- SOT-89-5
- Pins
- 5
- Details
- equivalent [3.3V LDO]
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
2 more parts have no package on record
CFH400T4 pins, InfineonNot recordedNot recorded4 pinsInfineon
- What it is
- Not recorded
- Maker
- Infineon
- Package
- Not recorded
- Pins
- 4
- Details
- Pseudomorphic high electron mobility transistor: GaAs, LN, UHF, 6.5V, 80mA, 150mW, 1.8GHz, 15.7dB
- Source
- Published code list
Is it dead? The meter test is below: Bipolar transistor.
S-1131B33PD-N4STF6 pins, ABLICNot recordedNot recorded6 pinsABLIC
- What it is
- Not recorded
- Maker
- ABLIC
- Package
- Not recorded
- Pins
- 6
- Details
- equivalent [3.3V LDO]
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
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.
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.
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.
Printed with a code easy to misread as N4S
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 N4S
For a marking with its end worn or burnt off. Each code has a page of its own.
Codes not listed here are printed on 6 more parts.
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