SMD code BLs
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 BL was searched.
121 parts are printed BLs
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.
ABCP56-16-HFSOT-223NPN transistor, 4 pins, ComchipNPN transistorSOT-2234 pinsComchip
- What it is
- NPN transistor
- Maker
- Comchip
- Package
- SOT-223
- Pins
- 4
- Details
- 80 V, 1 A NPN transistor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
ABCX56-16-HFSOT-89NPN transistor, 3 pins, ComchipNPN transistorSOT-893 pinsComchip
- What it is
- NPN transistor
- Maker
- Comchip
- Package
- SOT-89
- Pins
- 3
- Details
- 80 V, 1 A NPN transistor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
BCP56-16SOT-223NPN transistor, 4 pins, Galaxy MicroelectronicsNPN transistorSOT-2234 pinsGalaxy Microelectronics
- What it is
- NPN transistor
- Maker
- Galaxy Microelectronics
- Package
- SOT-223
- Pins
- 4
- Details
- 80V, 1A, General Purpose NPN Bipolar Transistor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
BCX56SOT-89NPN transistor, 3 pins, Yangjie Electronic TechNPN transistorSOT-893 pinsYangjie Electronic Tech
- What it is
- NPN transistor
- Maker
- Yangjie Electronic Tech
- Package
- SOT-89
- Pins
- 3
- Details
- NPN bipolar transistor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
BCX56-16SOT-89Transistor, 3 pins, InfineonTransistorSOT-893 pinsInfineon
- What it is
- Transistor
- Maker
- Infineon
- Package
- SOT-89
- Pins
- 3
- Details
- SMD General Purpose NPN Transistors
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Bipolar transistor.
BCX56-16-3LSOT-23NPN transistor, 3 pins, Galaxy MicroelectronicsNPN transistorSOT-233 pinsGalaxy Microelectronics
- What it is
- NPN transistor
- Maker
- Galaxy Microelectronics
- Package
- SOT-23
- Pins
- 3
- Details
- 80V, 1A, General Purpose NPN Bipolar Transistor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
BCX56-16,115SOT-89NPN transistor, 3 pins, HXYNPN transistorSOT-893 pinsHXY
- What it is
- NPN transistor
- Maker
- HXY
- Package
- SOT-89
- Pins
- 3
- Details
- Bipolar transistor, 80 V, 1 A
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
BCX56-16QSOT-89NPN transistor, 3 pins, Yangjie Electronic TechNPN transistorSOT-893 pinsYangjie Electronic Tech
- What it is
- NPN transistor
- Maker
- Yangjie Electronic Tech
- Package
- SOT-89
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
BCX56,115SOT-89NPN transistor, 3 pins, HXYNPN transistorSOT-893 pinsHXY
- What it is
- NPN transistor
- Maker
- HXY
- Package
- SOT-89
- Pins
- 3
- Details
- Bipolar transistor, 80 V, 1 A
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
BCX56TFSOT-89NPN transistor, 3 pins, HXYNPN transistorSOT-893 pinsHXY
- What it is
- NPN transistor
- Maker
- HXY
- Package
- SOT-89
- Pins
- 3
- Details
- Bipolar transistor, 80 V, 1 A
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
BCX56TXSOT-89NPN transistor, 3 pins, HXYNPN transistorSOT-893 pinsHXY
- What it is
- NPN transistor
- Maker
- HXY
- Package
- SOT-89
- Pins
- 3
- Details
- Bipolar transistor, 80 V, 1 A
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
BGA420SOT-343RF amplifier (MMIC), 4 pins, InfineonRF amplifier (MMIC)SOT-3434 pinsInfineon
- What it is
- RF amplifier (MMIC)
- Maker
- Infineon
- Package
- SOT-343
- Pins
- 4
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: RF amplifier.
BZT52H-C12SOD-123FZener diode, 2 pins, NexperiaZener diodeSOD-123F2 pinsNexperia
- What it is
- Zener diode
- Maker
- Nexperia
- Package
- SOD-123F
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
2 more parts have no package on record
BFCN-1690+RF filter, Mini-CircuitsRF filterNot recordedNot recordedMini-Circuits
- What it is
- RF filter
- Maker
- Mini-Circuits
- Package
- Not recorded
- Pins
- Not recorded
- Details
- LTCC filter, 1570-1810 MHz
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: This part.
BZX884B43LZener diode, VishayZener diodeNot recordedNot recordedVishay
- What it is
- Zener diode
- Maker
- Vishay
- Package
- Not recorded
- Pins
- Not recorded
- Details
- 43 V Zener diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener 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.
NPN transistor
Diode range, part lifted or its base leg off the pad.
Working, it reads
Red 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.
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.
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.
RF amplifier
Voltage, board powered, on the output pin that the bias resistor or choke feeds.
Working, it reads
The output pin sits at the device voltage the datasheet gives, a few volts, below the supply.
Dead, it reads
- Output pin at 0 V, or near 0 Ω to ground with the power off: shorted inside.
- Output pin at the full supply voltage: open inside, no current flowing.
- On the board:
- Measured on the board with power on; the bias network is part of the reading.
- 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 figures depend on the part and its bias resistor. 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.
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.
Printed with a code easy to misread as BLs
One character differs, and it is one that is easy to confuse under a lamp. Each code has a page of its own.
Codes not listed here are printed on 51 more parts.
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