SMD code K in SOD-523
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.
8 parts in SOD-523 are printed K
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.
CH551S-30GPSOD-523Schottky diode, ChenmkoSchottky diodeChenmko
- What it is
- Schottky diode
- Maker
- Chenmko
- Package
- SOD-523
- Pins
- 2
- Details
- SCHOTTKY BARRIER DIODE, 30 V, 0.5 A
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
GBLCSC08CSOD-523ESD protection diode, ProTek DevicesESD protection diodeProTek Devices
- What it is
- ESD protection diode
- Maker
- ProTek Devices
- Package
- SOD-523
- Pins
- 2
- Details
- Ultra Low Capacitance TVS Array
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
RN142SMSOD-523PIN diode, ROHMPIN diodeROHM
- What it is
- PIN diode
- Maker
- ROHM
- Package
- SOD-523
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: PIN diode or varicap.
BB142SOD-523PhiNot recordedPhi
- What it is
- Not recorded
- Maker
- Phi
- Package
- SOD-523
- Pins
- 2
- Details
- Low Voltage Varicap
- Source
- Published code list
Is it dead? The meter test is below: PIN diode or varicap.
CH551H-30PTSOD-523Chenmko EnterpriseNot recordedChenmko Enterprise
- What it is
- Not recorded
- Maker
- Chenmko Enterprise
- Package
- SOD-523
- Pins
- 2
- Details
- Diode: SBD, 30V, 500mA, Vf<0.47V(500mA)
- Source
- Published code list
Is it dead? The meter test is below: Silicon diode.
CH551S-30PTSOD-523Chenmko EnterpriseNot recordedChenmko Enterprise
- What it is
- Not recorded
- Maker
- Chenmko Enterprise
- Package
- SOD-523
- Pins
- 2
- Details
- Diode: SBD, 30V, 500mA, Vf<0.47V(500mA)
- Source
- Published code list
Is it dead? The meter test is below: Silicon diode.
MAZS039SOD-523PanNot recordedPan
- What it is
- Not recorded
- Maker
- Pan
- Package
- SOD-523
- Pins
- 2
- Details
- Z-diode: 3,7..4,1V, 200mW
- Source
- Published code list
Is it dead? The meter test is below: Silicon diode.
MAZS0390LSOD-523PanNot recordedPan
- What it is
- Not recorded
- Maker
- Pan
- Package
- SOD-523
- Pins
- 2
- Details
- Z-diode: 3,7..3,97V, 200mW
- Source
- Published code list
Is it dead? The meter test is below: Silicon diode.
7 more parts have no package on record. Nothing rules them out, so they stay.
AOCA33103EDual N-channel MOSFET, Alpha & Omega SemiconductorDual N-channel MOSFETAlpha & Omega Semiconductor
- What it is
- Dual N-channel MOSFET
- Maker
- Alpha & Omega Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Common-drain dual N-channel battery MOSFET
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: N-channel MOSFET pair.
AOZ8S204BL2-03ESD protection diode, Alpha & Omega SemiconductorESD protection diodeAlpha & Omega Semiconductor
- What it is
- ESD protection diode
- Maker
- Alpha & Omega Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- ESD protection for high-speed interfaces
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
AOZ8S204BL2-05ESD protection diode, Alpha & Omega SemiconductorESD protection diodeAlpha & Omega Semiconductor
- What it is
- ESD protection diode
- Maker
- Alpha & Omega Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- ESD protection for high-speed interfaces
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
AOZ8S333UDS-05ESD protection diode, Alpha & Omega SemiconductorESD protection diodeAlpha & Omega Semiconductor
- What it is
- ESD protection diode
- Maker
- Alpha & Omega Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- ESD protection for high-speed interfaces
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
AOZ1356LI-01Load switch, Alpha & Omega SemiconductorLoad switchAlpha & Omega Semiconductor
- What it is
- Load switch
- Maker
- Alpha & Omega Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- USB Type-C protection switch
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Load switch.
AOZ8211ADI-02ESD protection diode, Alpha & Omega SemiconductorESD protection diodeAlpha & Omega Semiconductor
- What it is
- ESD protection diode
- Maker
- Alpha & Omega Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
AOZ8251BDI-12ESD protection diode, Alpha & Omega SemiconductorESD protection diodeAlpha & Omega Semiconductor
- What it is
- ESD protection diode
- Maker
- Alpha & Omega Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection 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.
TVS or ESD protection diode
Diode range, from the protected line to ground, part lifted if you can.
Working, it reads
A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.
Dead, it reads
- From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
- A reading both ways on a one-way part: leaky.
- A one-way part open both ways: failed open.
- On the board
- , a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
- Compare:
- The same part on the next line or connector pin is the healthy reading to compare with.
- Watch for:
- A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.
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.
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.
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.
Load switch
Voltage, board powered, black probe on ground.
Working, it reads
Switched on, the output pin sits at the input voltage. Switched off, it sits near 0 V.
Dead, it reads
- Output at the input voltage while switched off: the pass element has shorted.
- Input present and switched on, no output: failed open, or shut down into a shorted load. Power off and measure output to ground.
- On the board:
- An output near 0 Ω to ground is usually the load. Lift the output pin to see which.
- 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 pinout and whether the enable is active high or low differ between parts. The datasheet gives both.
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 K
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 K
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 2,446 more parts.
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