SMD code XBs
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 XB was searched.
74 parts are printed XBs
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.
R1210N312CSOT-23-55 pins, Nisshinbo Micro DevicesNot recordedSOT-23-55 pinsNisshinbo Micro Devices
- What it is
- Not recorded
- Maker
- Nisshinbo Micro Devices
- Package
- SOT-23-5
- Pins
- 5
- Details
- VR-IC: PWM step-up DC-DC converter, 3.1V, 100KHz
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
R3117N473CSOT-23-5Voltage supervisor, 5 pins, RicohVoltage supervisorSOT-23-55 pinsRicoh
- What it is
- Voltage supervisor
- Maker
- Ricoh
- Package
- SOT-23-5
- Pins
- 5
- Details
- Voltage detector IC: 4.7V±1%, -Reset PPO, Sense
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
R3132Q26EC3SOT-1434 pins, Nisshinbo Micro DevicesNot recordedSOT-1434 pinsNisshinbo Micro Devices
- What it is
- Not recorded
- Maker
- Nisshinbo Micro Devices
- Package
- SOT-143
- Pins
- 4
- Details
- CMOS-IC: Voltage Detector 2,63V, MR, -Reset Open drain output
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
RN5RK201BSOT-23-55 pins, Nisshinbo Micro DevicesNot recordedSOT-23-55 pinsNisshinbo Micro Devices
- What it is
- Not recorded
- Maker
- Nisshinbo Micro Devices
- Package
- SOT-23-5
- Pins
- 5
- Details
- VR-IC: VFM step-up DC-DC converter, Vout=2V±1,5%
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
RN1102SOT-416Digital transistor (NPN, resistors built in), 3 pins, ToshibaDigital transistor (NPN, resistors built in)SOT-4163 pinsToshiba
- What it is
- Digital transistor (NPN, resistors built in)
- Maker
- Toshiba
- Package
- SOT-416
- Pins
- 3
- Details
- Si-npn-Digi: Sw, 50V, 100mA, 100mW, R1/R2=10k/10k
- Source
- Published code list
Is it dead? The meter test is below: Digital transistor.
RN1102FVSOT-723Digital transistor (NPN, resistors built in), 3 pins, ToshibaDigital transistor (NPN, resistors built in)SOT-7233 pinsToshiba
- What it is
- Digital transistor (NPN, resistors built in)
- Maker
- Toshiba
- Package
- SOT-723
- Pins
- 3
- Details
- Si-npn-Digi: Sw, 50V, 100mA, 150mW, R1/R2=10k/10k
- Source
- Published code list
Is it dead? The meter test is below: Digital transistor.
RN1302SOT-323Digital transistor (NPN, resistors built in), 3 pins, ToshibaDigital transistor (NPN, resistors built in)SOT-3233 pinsToshiba
- What it is
- Digital transistor (NPN, resistors built in)
- Maker
- Toshiba
- Package
- SOT-323
- Pins
- 3
- Details
- Si-npn-Digi: Sw, 50V, 100mA, 400mW, R1/R2=10k/10k
- Source
- Published code list
Is it dead? The meter test is below: Digital transistor.
RN1402SOT-23Digital transistor (NPN, resistors built in), 3 pins, ToshibaDigital transistor (NPN, resistors built in)SOT-233 pinsToshiba
- What it is
- Digital transistor (NPN, resistors built in)
- Maker
- Toshiba
- Package
- SOT-23
- Pins
- 3
- Details
- Si-npn-Digi: Sw, 50V, 100mA, 400mW, R1/R2=10k/10k
- Source
- Published code list
Is it dead? The meter test is below: Digital transistor.
RN1502SOT-23-55 pins, ToshibaNot recordedSOT-23-55 pinsToshiba
- What it is
- Not recorded
- Maker
- Toshiba
- Package
- SOT-23-5
- Pins
- 5
- Details
- Si-npn-Digi: Dual, Sw, 50V, 100mA, 300mW, 250MHz, R1/R2=20k/10k
- Source
- Published code list
Is it dead? The meter test is below: This part.
RN1702SOT-3535 pins, ToshibaNot recordedSOT-3535 pinsToshiba
- What it is
- Not recorded
- Maker
- Toshiba
- Package
- SOT-353
- Pins
- 5
- Details
- Si-npn-Digi: Dual, Sw, 50V, 100mA, 300mW, 250MHz, R1/R2=20k/10k
- Source
- Published code list
Is it dead? The meter test is below: This part.
RN1702JESOT-5535 pins, ToshibaNot recordedSOT-5535 pinsToshiba
- What it is
- Not recorded
- Maker
- Toshiba
- Package
- SOT-553
- Pins
- 5
- Details
- Si-npn-Digi: Dual, Sw, 50V, 100mA, 100mW, 250MHz, R1/R2=20k/10k
- Source
- Published code list
Is it dead? The meter test is below: This part.
RN1902SOT-3636 pins, ToshibaNot recordedSOT-3636 pinsToshiba
- What it is
- Not recorded
- Maker
- Toshiba
- Package
- SOT-363
- Pins
- 6
- Details
- Si-npn-Digi: Dual, Sw, 50V, 100mA, 200mW, 250MHz, R1/R2=20k/10k
- Source
- Published code list
Is it dead? The meter test is below: This part.
3 more parts have no package on record
RN1102FNPN transistor, ToshibaNPN transistorNot recordedNot recordedToshiba
- What it is
- NPN transistor
- Maker
- Toshiba
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Si-npn-Digi: Sw, 50V, 100mA, 100mW, R1/R2=10k/10k
- Source
- Published code list
Is it dead? The meter test is below: NPN transistor.
RN1102FTDigital transistor (NPN, resistors built in), ToshibaDigital transistor (NPN, resistors built in)Not recordedNot recordedToshiba
- What it is
- Digital transistor (NPN, resistors built in)
- Maker
- Toshiba
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Si-npn-Digi: Sw, 50V, 100mA, 100mW, R1/R2=10k/10k
- Source
- Published code list
Is it dead? The meter test is below: Digital transistor.
RN1602ToshibaNot recordedNot recordedNot recordedToshiba
- What it is
- Not recorded
- Maker
- Toshiba
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Si-npn-Digi: Dual, Sw, 50V, 100mA, 300mW, 250MHz, R1/R2=20k/10k
- 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.
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.
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.
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.
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.
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