SMD code YB-
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.
59 parts are printed YB-
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.
RN2302SOT-233 pins, ToshibaNot recordedSOT-233 pinsToshiba
- What it is
- Not recorded
- Maker
- Toshiba
- Package
- SOT-23
- Pins
- 3
- Details
- Si-pnp-Digi: Sw, 50V, 100mA, 400mW, R1/R2=10k/10k
- Source
- Published code list
Is it dead? The meter test is below: This part.
RN2402SOT-23Digital transistor (PNP, resistors built in), 3 pins, ToshibaDigital transistor (PNP, resistors built in)SOT-233 pinsToshiba
- What it is
- Digital transistor (PNP, resistors built in)
- Maker
- Toshiba
- Package
- SOT-23
- Pins
- 3
- Details
- Si-pnp-Digi: Sw, 50V, 100mA, 400mW, R1/R2=10k/10k
- Source
- Published code list
Is it dead? The meter test is below: Digital transistor.
RN2502SOT-23-55 pins, ToshibaNot recordedSOT-23-55 pinsToshiba
- What it is
- Not recorded
- Maker
- Toshiba
- Package
- SOT-23-5
- Pins
- 5
- Details
- Si-pnp-Digi: Dual, Sw, 50V, 100mA, 300mW, R1/R2=10k/10k
- Source
- Published code list
Is it dead? The meter test is below: This part.
RN2702SOT-3535 pins, ToshibaNot recordedSOT-3535 pinsToshiba
- What it is
- Not recorded
- Maker
- Toshiba
- Package
- SOT-353
- Pins
- 5
- Details
- Si-pnp-Digi: Dual, Sw, 50V, 100mA, 200mW, R1/R2=10k/10k
- Source
- Published code list
Is it dead? The meter test is below: This part.
RN2702JESOT-5535 pins, ToshibaNot recordedSOT-5535 pinsToshiba
- What it is
- Not recorded
- Maker
- Toshiba
- Package
- SOT-553
- Pins
- 5
- Details
- Si-pnp-Digi: Dual, Sw, 50V, 100mA, 100mW, R1/R2=10k/10k
- Source
- Published code list
Is it dead? The meter test is below: This part.
RN2902FESOT-5636 pins, ToshibaNot recordedSOT-5636 pinsToshiba
- What it is
- Not recorded
- Maker
- Toshiba
- Package
- SOT-563
- Pins
- 6
- Details
- Si-pnp-Digi: Dual, Sw, 50V, 100mA, 100mW, R1/R2=10k/10k
- Source
- Published code list
Is it dead? The meter test is below: This part.
RP117K341DDFNLDO regulator, RicohLDO regulatorDFNNot recordedRicoh
- What it is
- LDO regulator
- Maker
- Ricoh
- Package
- DFN
- Pins
- Not recorded
- Details
- Linear voltage regulator IC: LDO, -3.4V±1%, 100mA, +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
RP201K091DDFNLDO regulator, RicohLDO regulatorDFNNot recordedRicoh
- What it is
- LDO regulator
- Maker
- Ricoh
- Package
- DFN
- Pins
- Not recorded
- Details
- Linear voltage regulator IC: LDO, 0.9V±1%, 150mA, +CE, CL, AE(Mode)
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
RT9715FGBSOT-23-5Load switch, 5 pins, RichtekLoad switchSOT-23-55 pinsRichtek
- What it is
- Load switch
- Maker
- Richtek
- Package
- SOT-23-5
- Pins
- 5
- Details
- Power switch
- Source
- Published code list
Is it dead? The meter test is below: Load switch.
RT9715FPBSOT-23-5Load switch, 5 pins, RichtekLoad switchSOT-23-55 pinsRichtek
- What it is
- Load switch
- Maker
- Richtek
- Package
- SOT-23-5
- Pins
- 5
- Details
- Power switch
- Source
- Published code list
Is it dead? The meter test is below: Load switch.
4 more parts have no package on record
RN2602ToshibaNot recordedNot recordedNot recordedToshiba
- What it is
- Not recorded
- Maker
- Toshiba
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Si-pnp-Digi: Dual, Sw, 50V, 100mA, 300mW, R1/R2=10k/10k
- Source
- Published code list
Is it dead? The meter test is below: This part.
RN2902ToshibaNot recordedNot recordedNot recordedToshiba
- What it is
- Not recorded
- Maker
- Toshiba
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Si-pnp-Digi: Dual, Sw, 50V, 100mA, 200mW, R1/R2=10k/10k
- Source
- Published code list
Is it dead? The meter test is below: This part.
XC6223H21BNR-GLDO regulator, TorexLDO regulatorNot recordedNot recordedTorex
- What it is
- LDO regulator
- Maker
- Torex
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Linear voltage regulator IC: LDO, 2.15V±1%, 300mA, +CE, CL, PDR, ICP
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
XC6501D32ANR-GLDO regulator, TorexLDO regulatorNot recordedNot recordedTorex
- What it is
- LDO regulator
- Maker
- Torex
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Linear voltage regulator IC: LDO, 3.25V±1%, 200mA, +CE, CL, PDR
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
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.
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.
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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