SMD code -K3
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.
111 parts are printed -K3
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.
EM6352XSP3B-1.8+SOT-233 pins, EM Microelectronic-Marin SANot recordedSOT-233 pinsEM Microelectronic-Marin SA
- What it is
- Not recorded
- Maker
- EM Microelectronic-Marin SA
- Package
- SOT-23
- Pins
- 3
- Source
- Published code list
Is it dead? The meter test is below: This part.
FP6146-28S8GSOT-23-5LDO regulator, 5 pins, FitipowerLDO regulatorSOT-23-55 pinsFitipower
- What it is
- LDO regulator
- Maker
- Fitipower
- Package
- SOT-23-5
- Pins
- 5
- Details
- Linear voltage regulator IC: LDO, 2.8V±2%, 300mA, +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
HSMP-3833SOT-233 pins, Agilent TechnologiesNot recordedSOT-233 pinsAgilent Technologies
- What it is
- Not recorded
- Maker
- Agilent Technologies
- Package
- SOT-23
- Pins
- 3
- Details
- dual HP3830 pin diode
- Source
- Published code list
Is it dead? The meter test is below: PIN diode or varicap.
KDV804MSOT-233 pins, KECNot recordedSOT-233 pinsKEC
- What it is
- Not recorded
- Maker
- KEC
- Package
- SOT-23
- Pins
- 3
- Details
- dual cc varicap 45pF
- Source
- Published code list
Is it dead? The meter test is below: PIN diode or varicap.
LDTB114TWT1GSOT-323Digital transistor (PNP, resistors built in), 3 pins, LRCDigital transistor (PNP, resistors built in)SOT-3233 pinsLRC
- What it is
- Digital transistor (PNP, resistors built in)
- Maker
- LRC
- Package
- SOT-323
- Pins
- 3
- Details
- PNP transistor: Sw., 50V, 500mA, B>56, R1=10k
- Source
- Published code list
Is it dead? The meter test is below: Digital transistor.
MAX810TTRSOT-233 pins, EEstek ElectronicsNot recordedSOT-233 pinsEEstek Electronics
- What it is
- Not recorded
- Maker
- EEstek Electronics
- Package
- SOT-23
- Pins
- 3
- Details
- CMOS-IC: Voltage Detector 3,08V, Reset Push-pull output
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
MMSZ5253SOD-123Zener diode, 2 pins, VishayZener diodeSOD-1232 pinsVishay
- What it is
- Zener diode
- Maker
- Vishay
- Package
- SOD-123
- Pins
- 2
- Details
- 25 V Zener diode
- Source
- An older or alternative marking, from a published code list
Is it dead? The meter test is below: Zener diode.
MMSZ5253B-FSOD-123FZener diode, 2 pins, Taitron ComponentsZener diodeSOD-123F2 pinsTaitron Components
- What it is
- Zener diode
- Maker
- Taitron Components
- Package
- SOD-123F
- Pins
- 2
- Details
- Zener diode: 23.75 26.25V, Izt=5.0mA, 500mW
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
MMSZ52353SOD-1232 pins, VishayNot recordedSOD-1232 pinsVishay
- What it is
- Not recorded
- Maker
- Vishay
- Package
- SOD-123
- Pins
- 2
- Details
- zener 300mW 5% 6.8V
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
MTNK3N3SOT-23N-channel MOSFET, 3 pinsN-channel MOSFETSOT-233 pinsNot recorded
- What it is
- N-channel MOSFET
- Maker
- Not recorded
- Package
- SOT-23
- Pins
- 3
- Source
- Published code list
Is it dead? The meter test is below: N-channel MOSFET.
PZU3.6B2LSOD-882Zener diode, 2 pins, NXPZener diodeSOD-8822 pinsNXP
- What it is
- Zener diode
- Maker
- NXP
- Package
- SOD-882
- Pins
- 2
- Details
- Zener diode: 3.55..3.80V, Zzt=90(Iz=5mA), 250mW
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
4 more parts have no package on record
HN1L03FUComplementary MOSFET pair (N-channel and P-channel), ToshibaComplementary MOSFET pair (N-channel and P-channel)Not recordedNot recordedToshiba
- What it is
- Complementary MOSFET pair (N-channel and P-channel)
- Maker
- Toshiba
- Package
- Not recorded
- Pins
- Not recorded
- Details
- MOSFET n/p-type: Dual, Sw, LogL, 50V, 50mA, 200mW, <40(10mA), 0.15/0.13µs
- Source
- Published code list
Is it dead? The meter test is below: MOSFET pair.
LDTB114TKT1GDigital transistor (PNP, resistors built in), LRCDigital transistor (PNP, resistors built in)Not recordedNot recordedLRC
- What it is
- Digital transistor (PNP, resistors built in)
- Maker
- LRC
- Package
- Not recorded
- Pins
- Not recorded
- Details
- PNP transistor: Sw., 50V, 500mA, B>56, R1=10k
- Source
- Published code list
Is it dead? The meter test is below: Digital transistor.
LM48861TMNational SemiconductorNot recordedNot recordedNot recordedNational Semiconductor
- What it is
- Not recorded
- Maker
- National Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Linear IC: APA, 1.2..2.8V, 2x26mW(2V/16), I2C volume
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
NC7SP14LFairchild SemiconductorNot recordedNot recordedNot recordedFairchild Semiconductor
- What it is
- Not recorded
- Maker
- Fairchild Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS logic IC: Inverter with Schmitt-trigger input
- 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.
This part
Diode range and ohms range, part lifted.
Working, it reads
Depends on what it is. The datasheet, or an identical part, says.
Dead, it reads
- Between two pins, the same reading both ways, near 0 V with a continuous beep: shorted.
- Open between every pair of pins: failed open, or a part that reads open when working.
- 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.
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.
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
One way between drain and source reads about 0.4 to 0.9 V, the body diode, and the other way open. The gate reads open to both other pins.
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.
- No body diode at all: failed open.
- On the board
- the gate usually has a resistor to the source, which reads as that resistor and 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.
PIN diode or varicap
Diode range, part lifted or one leg off the pad. Red probe on the anode.
Working, it reads
About 0.6 to 0.9 V anode to cathode, 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.
- 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 varicap that has drifted in capacitance reads normal on a meter. Only a capacitance meter or the tuning itself shows it.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Digital transistor
Ohms range, part lifted. The datasheet gives the built-in resistors: R1 in series with the base, R2 from base to emitter.
Working, it reads
Base to emitter reads about R1 plus R2 either way round, about 20 kΩ on a 10 k and 10 k part, give or take their wide tolerance. Collector to emitter reads open. A part with no R2 reads a junction behind R1 one way instead.
Dead, it reads
- Collector to emitter the same both ways, near 0 Ω with a continuous beep: shorted.
- From the base, open or far above R1 plus R2: R1 has failed. Static damage shows here most often.
- Base to emitter near 0 Ω: failed short.
- 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:
- The readings depend on the resistor values, so an identical part elsewhere on the board is the surest reference. Measure it the same way.
- Watch for:
- On the diode range a good part with 10 kΩ resistors reads open on every pair, so a good part looks dead there. Use the ohms range.
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.
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.
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