SMD code K38
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.
K38 on a chip resistor
380 Ω
380 Ω resistor
The K is both the decimal point and the multiplier: 380 Ω.
Check it with a meter
Lift one end and measure across it. A good one reads 380 Ω. Measuring it in circuit reads the parallel combination of everything around it, which is almost always lower, never higher: well above 380 Ω on the board is a fault. Open, or well above 380 Ω, means it has failed: burnt, cracked or corroded. That does not change what to fit: the marking still says 380 Ω. A burnt resistor usually means the part it feeds drew too much, so find that before fitting a new one.
On a transistor or diode body (SOT-23-5, SOT-23, SOT-323), K38 is a part code instead. Those parts are listed below.
16 parts are printed K38
Not sure which one you have?
Answer up to 4 quick questions and these 16 parts are ranked, with a meter test that settles it. It works on a dead part too.
BSS138SOT-23N-channel MOSFET, 3 pins, Galaxy MicroelectronicsN-channel MOSFETSOT-233 pinsGalaxy Microelectronics
- What it is
- N-channel MOSFET
- Maker
- Galaxy Microelectronics
- Package
- SOT-23
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: N-channel MOSFET.
BSS138WSOT-323N-channel MOSFET, 3 pins, Galaxy MicroelectronicsN-channel MOSFETSOT-3233 pinsGalaxy Microelectronics
- What it is
- N-channel MOSFET
- Maker
- Galaxy Microelectronics
- Package
- SOT-323
- Pins
- 3
- Details
- 0.2A, 50V, 0.2W, N Channel, Small Signal MOSFETs
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: N-channel MOSFET.
DS38WSOD-123FSchottky diode, 2 pins, YFWSchottky diodeSOD-123F2 pinsYFW
- What it is
- Schottky diode
- Maker
- YFW
- Package
- SOD-123F
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
GSFK0502SOT-363Dual N-channel MOSFET, 6 pins, Good-ArkDual N-channel MOSFETSOT-3636 pinsGood-Ark
- What it is
- Dual N-channel MOSFET
- Maker
- Good-Ark
- Package
- SOT-363
- Pins
- 6
- Details
- Dual N-channel MOSFET, 50 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: N-channel MOSFET pair.
TBSS138SOT-23N-channel MOSFET, 3 pins, Galaxy MicroelectronicsN-channel MOSFETSOT-233 pinsGalaxy Microelectronics
- What it is
- N-channel MOSFET
- Maker
- Galaxy Microelectronics
- Package
- SOT-23
- Pins
- 3
- Details
- 0.2A, 50V, 0.3W, N Channel, Small Signal MOSFETs
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: N-channel MOSFET.
TSV992IQ2TDFNOperational amplifier, STMicroelectronicsOperational amplifierDFNNot recordedSTMicroelectronics
- What it is
- Operational amplifier
- Maker
- STMicroelectronics
- Package
- DFN
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Integrated circuit.
BSS138DWSOT-363N-channel MOSFET, 6 pins, Diodes IncorporatedN-channel MOSFETSOT-3636 pinsDiodes Incorporated
- What it is
- N-channel MOSFET
- Maker
- Diodes Incorporated
- Package
- SOT-363
- Pins
- 6
- Source
- Published code list
Is it dead? The meter test is below: N-channel MOSFET.
KIC73D38TSOT-23Voltage supervisor, 3 pins, KECVoltage supervisorSOT-233 pinsKEC
- What it is
- Voltage supervisor
- Maker
- KEC
- Package
- SOT-23
- Pins
- 3
- Details
- Voltage detector IC: 3.8V±1%, -Reset PPO, Rdt=200ms
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
RP112N381BSOT-23-5LDO regulator, 5 pins, RicohLDO regulatorSOT-23-55 pinsRicoh
- What it is
- LDO regulator
- Maker
- Ricoh
- Package
- SOT-23-5
- Pins
- 5
- Details
- Linear voltage regulator IC: LDO, 3.8V±1%, 150mA, +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
XC6366A382MRSOT-23-5DC-DC converter, 5 pins, TorexDC-DC converterSOT-23-55 pinsTorex
- What it is
- DC-DC converter
- Maker
- Torex
- Package
- SOT-23-5
- Pins
- 5
- Details
- DC/DC voltage converter IC: PWM/PFM st-dwn, 180kHz, 3.8V±2.5%, 1A, +CE
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
XC6368A382MRSOT-23-5DC-DC converter, 5 pins, TorexDC-DC converterSOT-23-55 pinsTorex
- What it is
- DC-DC converter
- Maker
- Torex
- Package
- SOT-23-5
- Pins
- 5
- Details
- DC/DC voltage converter IC: PWM/PFM st-up, 3.8V±2.5%, 200mA, 180kHz, +CE
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
XC6383B381MSOT-23DC-DC converter, 3 pins, TorexDC-DC converterSOT-233 pinsTorex
- What it is
- DC-DC converter
- Maker
- Torex
- Package
- SOT-23
- Pins
- 3
- Details
- DC/DC voltage converter IC: PFM st-up, 3.8V±2.5%, 400mA, 100kHz, ext. transis.
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
XC6383B381PSOT-89DC-DC converter, 3 pins, TorexDC-DC converterSOT-893 pinsTorex
- What it is
- DC-DC converter
- Maker
- Torex
- Package
- SOT-89
- Pins
- 3
- Details
- DC/DC voltage converter IC: PFM st-up, 3.8V±2.5%, 400mA, 100kHz, ext. transis.
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
XC9302A382MRSOT-23-5DC-DC converter, 5 pins, TorexDC-DC converterSOT-23-55 pinsTorex
- What it is
- DC-DC converter
- Maker
- Torex
- Package
- SOT-23-5
- Pins
- 5
- Details
- DC/DC voltage converter IC: PWM/PFM st-up/dwn, 180kHz, 3.8V±2.5%, 250mA, +CE
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
1 more part has no package on record
KIC73D38MVoltage supervisor, KECVoltage supervisorNot recordedNot recordedKEC
- What it is
- Voltage supervisor
- Maker
- KEC
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 3.8V±1%, -Reset PPO, Rdt=200ms
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
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.
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.
N-channel MOSFET pair
Diode range, part lifted. Test drain to source first, then short gate to source and test again. Test each MOSFET on its own pins, as the datasheet's pinout gives them.
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.
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 K38
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 K38
For a marking with its end worn or burnt off. Each code has a page of its own.
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