SMD code R4s
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 R4 was searched.
83 parts are printed R4s
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.
ACMSN3404-HFSOT-23N-channel MOSFET, 3 pins, ComchipN-channel MOSFETSOT-233 pinsComchip
- What it is
- N-channel MOSFET
- Maker
- Comchip
- Package
- SOT-23
- Pins
- 3
- Details
- 30 V, 5.8 A N-channel MOSFET
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: N-channel MOSFET.
BFP640SOT-343RF transistor, 4 pins, InfineonRF transistorSOT-3434 pinsInfineon
- What it is
- RF transistor
- Maker
- Infineon
- Package
- SOT-343
- Pins
- 4
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Bipolar transistor.
BZT52B6V2SOD-123Zener diode, 2 pins, YFWZener diodeSOD-1232 pinsYFW
- What it is
- Zener diode
- Maker
- YFW
- Package
- SOD-123
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
BZX84-B68SOT-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
- 68 V ±2% voltage regulator (Zener) diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
CJ3404SOT-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, 5.8 A
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: N-channel MOSFET.
CJ3404-HFSOT-23N-channel MOSFET, 3 pins, ComchipN-channel MOSFETSOT-233 pinsComchip
- What it is
- N-channel MOSFET
- Maker
- Comchip
- Package
- SOT-23
- Pins
- 3
- Details
- 30 V, 5.8 A N-channel MOSFET
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: N-channel MOSFET.
GSMBR0540SOD-123Schottky diode, 2 pins, Good-ArkSchottky diodeSOD-1232 pinsGood-Ark
- What it is
- Schottky diode
- Maker
- Good-Ark
- Package
- SOD-123
- Pins
- 2
- Details
- Schottky diode, 40 V, 500 mA
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
LMBR4010BST5GSOD-882Schottky diode, 2 pins, LRCSchottky diodeSOD-8822 pinsLRC
- What it is
- Schottky diode
- Maker
- LRC
- Package
- SOD-882
- Pins
- 2
- Details
- Schottky diode, VR 40 V, IF 1 A, VF Max 0.6 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
MM1Z6V2BWSOD-123Zener diode, 2 pins, YFWZener diodeSOD-1232 pinsYFW
- What it is
- Zener diode
- Maker
- YFW
- Package
- SOD-123
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
MM5Z6V2TSOT-523Zener diode, 3 pins, SeCoSZener diodeSOT-5233 pinsSeCoS
- What it is
- Zener diode
- Maker
- SeCoS
- Package
- SOT-523
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
MMSZ5236BSOD-123FZener diode, 2 pins, DiotecZener diodeSOD-123F2 pinsDiotec
- What it is
- Zener diode
- Maker
- Diotec
- Package
- SOD-123F
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
S-LMBR4010BST5GSOD-882Schottky diode, 2 pins, LRCSchottky diodeSOD-8822 pinsLRC
- What it is
- Schottky diode
- Maker
- LRC
- Package
- SOD-882
- Pins
- 2
- Details
- Schottky diode, VR 40 V, IF 1 A, VF Max 0.6 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
SN74LVC1G125DPWX2SONLogic gate, 5 pins, Texas InstrumentsLogic gateX2SON5 pinsTexas Instruments
- What it is
- Logic gate
- Maker
- Texas Instruments
- Package
- X2SON
- Pins
- 5
- Details
- Single Bus Buffer Gate With 3-State Output
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Integrated circuit.
2 more parts have no package on record
GSBA1040LPSchottky diode, Good-ArkSchottky diodeNot recordedNot recordedGood-Ark
- What it is
- Schottky diode
- Maker
- Good-Ark
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Schottky diode, 40 V, 1 A
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
LM3404N-channel MOSFET, LeiditechN-channel MOSFETNot recordedNot recordedLeiditech
- What it is
- N-channel MOSFET
- Maker
- Leiditech
- Package
- Not recorded
- Pins
- Not recorded
- Details
- N-channel MOSFET, 30 V, 5.6 A
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: N-channel MOSFET.
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.
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.
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.
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.
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.
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 R4s
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 R4s
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 240 more parts.
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