SMD code BK-
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.
189 parts are printed BK-
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.
SZ1SMA14AT3GSMATVS diode, 2 pins, HXYTVS diodeSMA2 pinsHXY
- What it is
- TVS diode
- Maker
- HXY
- Package
- SMA
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
2SB1590KSOT-23PNP transistor, 3 pins, ROHMPNP transistorSOT-233 pinsROHM
- What it is
- PNP transistor
- Maker
- ROHM
- Package
- SOT-23
- Pins
- 3
- Details
- PNP bipolar transistor
- Source
- Published code list
Is it dead? The meter test is below: PNP transistor.
6.0SMAJ14CASMATVS diode, 2 pins, UN SemiconductorTVS diodeSMA2 pinsUN Semiconductor
- What it is
- TVS diode
- Maker
- UN Semiconductor
- Package
- SMA
- Pins
- 2
- Details
- 14V, 600W, Surface Mount TVS
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
AP1772B-28GCSOT-23LDO regulator, 3 pins, Anwell SemiconductorLDO regulatorSOT-233 pinsAnwell Semiconductor
- What it is
- LDO regulator
- Maker
- Anwell Semiconductor
- Package
- SOT-23
- Pins
- 3
- Details
- Linear voltage regulator IC: LDO, 2.8V±2%, 300mA, H-free
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
AP1772B-28GC1SOT-23LDO regulator, 3 pins, Anwell SemiconductorLDO regulatorSOT-233 pinsAnwell Semiconductor
- What it is
- LDO regulator
- Maker
- Anwell Semiconductor
- Package
- SOT-23
- Pins
- 3
- Details
- Linear voltage regulator IC: LDO, 2.8V±1%, 300mA, H-free
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
AP1772B-28GXSOT-323LDO regulator, 3 pins, Anwell SemiconductorLDO regulatorSOT-3233 pinsAnwell Semiconductor
- What it is
- LDO regulator
- Maker
- Anwell Semiconductor
- Package
- SOT-323
- Pins
- 3
- Details
- Linear voltage regulator IC: LDO, 2.8V±2%, 300mA, H-free
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
AP1772B-28GX1SOT-323LDO regulator, 3 pins, Anwell SemiconductorLDO regulatorSOT-3233 pinsAnwell Semiconductor
- What it is
- LDO regulator
- Maker
- Anwell Semiconductor
- Package
- SOT-323
- Pins
- 3
- Details
- Linear voltage regulator IC: LDO, 2.8V±1%, 300mA, H-free
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
AP1772B-28PCSOT-23LDO regulator, 3 pins, Anwell SemiconductorLDO regulatorSOT-233 pinsAnwell Semiconductor
- What it is
- LDO regulator
- Maker
- Anwell Semiconductor
- Package
- SOT-23
- Pins
- 3
- Details
- Linear voltage regulator IC: LDO, 2.8V±2%, 300mA, Pb-free
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
AP1772B-28PC1SOT-23LDO regulator, 3 pins, Anwell SemiconductorLDO regulatorSOT-233 pinsAnwell Semiconductor
- What it is
- LDO regulator
- Maker
- Anwell Semiconductor
- Package
- SOT-23
- Pins
- 3
- Details
- Linear voltage regulator IC: LDO, 2.8V±1%, 300mA, Pb-free
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
AP1772B-28PXSOT-323LDO regulator, 3 pins, Anwell SemiconductorLDO regulatorSOT-3233 pinsAnwell Semiconductor
- What it is
- LDO regulator
- Maker
- Anwell Semiconductor
- Package
- SOT-323
- Pins
- 3
- Details
- Linear voltage regulator IC: LDO, 2.8V±2%, 300mA, Pb-free
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
AP1772B-28PX1SOT-323LDO regulator, 3 pins, Anwell SemiconductorLDO regulatorSOT-3233 pinsAnwell Semiconductor
- What it is
- LDO regulator
- Maker
- Anwell Semiconductor
- Package
- SOT-323
- Pins
- 3
- Details
- Linear voltage regulator IC: LDO, 2.8V±1%, 300mA, Pb-free
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
AP2553FDCSOT-23-6Load switch, 6 pins, Diodes IncorporatedLoad switchSOT-23-66 pinsDiodes Incorporated
- What it is
- Load switch
- Maker
- Diodes Incorporated
- Package
- SOT-23-6
- Pins
- 6
- Details
- Power switch
- Source
- Published code list
Is it dead? The meter test is below: Load switch.
AP2553W6SOT-23-6Load switch, 6 pins, Diodes IncorporatedLoad switchSOT-23-66 pinsDiodes Incorporated
- What it is
- Load switch
- Maker
- Diodes Incorporated
- Package
- SOT-23-6
- Pins
- 6
- Details
- Power switch
- Source
- Published code list
Is it dead? The meter test is below: Load switch.
AX6608AR-15RSOT-23LDO regulator, 3 pins, AXElite TechnologyLDO regulatorSOT-233 pinsAXElite Technology
- What it is
- LDO regulator
- Maker
- AXElite Technology
- Package
- SOT-23
- Pins
- 3
- Details
- Linear voltage regulator IC: LDO, 1.5V±2%, 300mA
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
1 more part has no package on record
2SB1323Sanyo ElectricNot recordedNot recordedNot recordedSanyo Electric
- What it is
- Not recorded
- Maker
- Sanyo Electric
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Si-pnp-Digi+Di: Motor-Drv, 40V, 3A, 1,5W, B>70, 100MHz, R1/R2=160/800R
- Source
- Published code list
Is it dead? The meter test is below: This part.
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.
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.
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.
PNP transistor
Diode range, part lifted or its base leg off the pad.
Working, it reads
Black probe on the base 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.
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.
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.
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