SMD code S4
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.
13 parts are printed S4
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.
1PS76SB40SOD-323Schottky diode, 2 pins, NexperiaSchottky diodeSOD-3232 pinsNexperia
- What it is
- Schottky diode
- Maker
- Nexperia
- Package
- SOD-323
- Pins
- 2
- Source
- From the manufacturer's datasheet
Is it dead? The meter test is below: Schottky diode.
1SS355SOD-323Switching diode, 2 pins, Taiwan SemiconductorSwitching diodeSOD-3232 pinsTaiwan Semiconductor
- What it is
- Switching diode
- Maker
- Taiwan Semiconductor
- Package
- SOD-323
- Pins
- 2
- Details
- Switching diode, 80 V, 100 mA
- Source
- From the manufacturer's datasheet
Is it dead? The meter test is below: Silicon diode.
1SS389SOD-523Schottky diode, 2 pins, JSCJSchottky diodeSOD-5232 pinsJSCJ
- What it is
- Schottky diode
- Maker
- JSCJ
- Package
- SOD-523
- Pins
- 2
- Details
- Schottky diode, 10 V, 0.1 A
- Source
- From the manufacturer's datasheet
Is it dead? The meter test is below: Schottky diode.
BAV70MSOT-883Switching diode, 3 pins, NexperiaSwitching diodeSOT-8833 pinsNexperia
- What it is
- Switching diode
- Maker
- Nexperia
- Package
- SOT-883
- Pins
- 3
- Details
- High-speed switching diode, dual common cathode, leadless
- Source
- From the manufacturer's datasheet
Is it dead? The meter test is below: Silicon diode.
BZX84-B3V9SOT-23Zener diode, 3 pins, NexperiaZener diodeSOT-233 pinsNexperia
- What it is
- Zener diode
- Maker
- Nexperia
- Package
- SOT-23
- Pins
- 3
- Pinout
- 1 anode
- 2 not connected
- 3 cathode
- Details
- 3.9 V ±2% voltage regulator (Zener) diode
- Source
- From the manufacturer's datasheet
Is it dead? The meter test is below: Zener diode.
CJ2304SOT-23N-channel MOSFET, 3 pins, JSCJN-channel MOSFETSOT-233 pinsJSCJ
- What it is
- N-channel MOSFET
- Maker
- JSCJ
- Package
- SOT-23
- Pins
- 3
- Details
- MOSFET, N-channel, 30 V, 3.3 A
- Source
- From the manufacturer's datasheet
Is it dead? The meter test is below: N-channel MOSFET.
SD103AWSOD-123Schottky diode, 2 pins, Taiwan SemiconductorSchottky diodeSOD-1232 pinsTaiwan Semiconductor
- What it is
- Schottky diode
- Maker
- Taiwan Semiconductor
- Package
- SOD-123
- Pins
- 2
- Source
- From the manufacturer's datasheet
Is it dead? The meter test is below: Schottky diode.
SD103AWGWSOD-123Schottky diode, 2 pins, DiotecSchottky diodeSOD-1232 pinsDiotec
- What it is
- Schottky diode
- Maker
- Diotec
- Package
- SOD-123
- Pins
- 2
- Details
- SMD Small Signal Schottky Diodes
- Source
- From the manufacturer's datasheet
Is it dead? The meter test is below: Schottky diode.
SD103AWHSOD-123Schottky diode, 2 pins, Taiwan SemiconductorSchottky diodeSOD-1232 pinsTaiwan Semiconductor
- What it is
- Schottky diode
- Maker
- Taiwan Semiconductor
- Package
- SOD-123
- Pins
- 2
- Source
- From the manufacturer's datasheet
Is it dead? The meter test is below: Schottky diode.
SD103AXSOD-523Schottky diode, 2 pins, JSCJSchottky diodeSOD-5232 pinsJSCJ
- What it is
- Schottky diode
- Maker
- JSCJ
- Package
- SOD-523
- Pins
- 2
- Details
- Schottky diode, 40 V, 0.35 A
- Source
- From the manufacturer's datasheet
Is it dead? The meter test is below: Schottky diode.
SN74LVC1G17DPWX2SONLogic gate, 5 pins, Texas InstrumentsLogic gateX2SON5 pinsTexas Instruments
- What it is
- Logic gate
- Maker
- Texas Instruments
- Package
- X2SON
- Pins
- 5
- Details
- Single Schmitt-Trigger Buffer
- Source
- From the manufacturer's datasheet
Is it dead? The meter test is below: Integrated circuit.
ZHCS350WTSOD-523Schottky diode, 2 pins, DiotecSchottky diodeSOD-5232 pinsDiotec
- What it is
- Schottky diode
- Maker
- Diotec
- Package
- SOD-523
- Pins
- 2
- Details
- SMD Low Barrier Schottky Rectifier Diodes
- Source
- From the manufacturer's datasheet
Is it dead? The meter test is below: Schottky diode.
1 more part has no package on record
SD103AXM5Schottky diode, Taiwan SemiconductorSchottky diodeNot recordedNot recordedTaiwan Semiconductor
- What it is
- Schottky diode
- Maker
- Taiwan Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Source
- From the manufacturer's datasheet
Is it dead? The meter test is below: Schottky 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.
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.
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.
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.
N-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 source, black on the drain: 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. A drain short can be the load. 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.
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.
Printed with a code easy to misread as S4
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 S4
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 11 more parts.
Open this in the search to correct a character or try another package.