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.
BSS84PSOT-23P-channel MOSFET, 3 pins, InfineonP-channel MOSFETSOT-233 pinsInfineon
- What it is
- P-channel MOSFET
- Maker
- Infineon
- Package
- SOT-23
- Pins
- 3
- Details
- P-channel enhancement mode Field-Effect Transistor (FET), -60 V, SOT-23
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: P-channel MOSFET.
BSS84PWSOT-323P-channel MOSFET, 3 pins, InfineonP-channel MOSFETSOT-3233 pinsInfineon
- What it is
- P-channel MOSFET
- Maker
- Infineon
- Package
- SOT-323
- Pins
- 3
- Details
- P-channel enhancement mode Field-Effect Transistor (FET), -60 V, SOT-323
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: P-channel MOSFET.
BZT52C6V2SOD-123Zener diode, 2 pins, VishayZener diodeSOD-1232 pinsVishay
- What it is
- Zener diode
- Maker
- Vishay
- Package
- SOD-123
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
BZT52C6V2-GSOD-123Zener diode, 2 pins, VishayZener diodeSOD-1232 pinsVishay
- What it is
- Zener diode
- Maker
- Vishay
- Package
- SOD-123
- Pins
- 2
- Details
- 526.2 V Zener diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
KDZV16BSOD-123FZener diode, 2 pins, ROHMZener diodeSOD-123F2 pinsROHM
- What it is
- Zener diode
- Maker
- ROHM
- Package
- SOD-123F
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
KDZVTF16BSOD-123FZener diode, 2 pins, ROHMZener diodeSOD-123F2 pinsROHM
- What it is
- Zener diode
- Maker
- ROHM
- Package
- SOD-123F
- Pins
- 2
- Details
- Zener Diode (AEC-Q101 qualified)
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
LESD5Z5.0BT5GSOD-523ESD protection diode, 2 pins, LRCESD protection diodeSOD-5232 pinsLRC
- What it is
- ESD protection diode
- Maker
- LRC
- Package
- SOD-523
- Pins
- 2
- Details
- ESD protection diode, VRWM 5 V, IR @VRWM 1 μA, VBR Min 6.2 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
SMZG3801BSMBGZener diode, 2 pins, VishayZener diodeSMBG2 pinsVishay
- What it is
- Zener diode
- Maker
- Vishay
- Package
- SMBG
- Pins
- 2
- Details
- 33 V Zener diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
SMZJ3801BSMBZener diode, 2 pins, VishayZener diodeSMB2 pinsVishay
- What it is
- Zener diode
- Maker
- Vishay
- Package
- SMB
- Pins
- 2
- Details
- 33 V Zener diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
TZT13CWSOT-23Zener diode, 3 pins, Taitron ComponentsZener diodeSOT-233 pinsTaitron Components
- What it is
- Zener diode
- Maker
- Taitron Components
- Package
- SOT-23
- Pins
- 3
- Details
- SMD Zener Diodes (Three Terminals) - 300mW
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
2SK680ASOT-89N-channel MOSFET, 3 pins, NEC ElectronicsN-channel MOSFETSOT-893 pinsNEC Electronics
- What it is
- N-channel MOSFET
- Maker
- NEC Electronics
- Package
- SOT-89
- Pins
- 3
- Details
- MOSFET n-type: Sw, 30V, 1A, 2W, Rds=0.6 (500mA), 12..44ns
- Source
- Published code list
Is it dead? The meter test is below: N-channel MOSFET.
4 more parts have no package on record
ESDHD05UFESD protection diode, WeEn SemiconductorsESD protection diodeNot recordedNot recordedWeEn Semiconductors
- What it is
- ESD protection diode
- Maker
- WeEn Semiconductors
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
KRC822EDigital transistor (NPN, resistors built in), KECDigital transistor (NPN, resistors built in)Not recordedNot recordedKEC
- What it is
- Digital transistor (NPN, resistors built in)
- Maker
- KEC
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Digital transistor.
KRC822UDigital transistor (NPN, resistors built in), KECDigital transistor (NPN, resistors built in)Not recordedNot recordedKEC
- What it is
- Digital transistor (NPN, resistors built in)
- Maker
- KEC
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Digital transistor.
PBZ16BZener diode, ROHMZener diodeNot recordedNot recordedROHM
- What it is
- Zener diode
- Maker
- ROHM
- Package
- Not recorded
- Pins
- Not recorded
- 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.
P-channel MOSFET
Diode range, part lifted. Test drain to source first, then short gate to source and test again.
Working, it reads
Red probe on the drain, black on the source: 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. 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.
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.
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.
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.
N-channel MOSFET
Diode range, part lifted. Test drain to source first, then short gate to source and test again.
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.
Printed with a code easy to misread as YB-
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 3 more parts.
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