SMD code Y8s
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 Y8 was searched.
82 parts are printed Y8s
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.
CZRT55C22SOT-23Zener diode, 3 pins, ComchipZener diodeSOT-233 pinsComchip
- What it is
- Zener diode
- Maker
- Comchip
- Package
- SOT-23
- Pins
- 3
- Details
- Zener diode: 20.8..23.3V, Zzt=55, Izt=5mA, 350mW
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
ELM7648LBBSOT-23Voltage supervisor, 3 pins, ELM TechnologyVoltage supervisorSOT-233 pinsELM Technology
- What it is
- Voltage supervisor
- Maker
- ELM Technology
- Package
- SOT-23
- Pins
- 3
- Details
- Voltage detector IC: 4.8V±2%, -Reset PPO, Rdt=500ms
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
MFPZ4744ASOD-123FZener diode, 2 pins, Taitron ComponentsZener diodeSOD-123F2 pinsTaitron Components
- What it is
- Zener diode
- Maker
- Taitron Components
- Package
- SOD-123F
- Pins
- 2
- Details
- Zener diode: 14.3..15.8V, Izt=17.0mA, 1W
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
MM5Z22VSOD-523Zener diode, 2 pins, SecZener diodeSOD-5232 pinsSec
- What it is
- Zener diode
- Maker
- Sec
- Package
- SOD-523
- Pins
- 2
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
MM5Z27HSOD-523Zener diode, 2 pins, Zowie TechnologyZener diodeSOD-5232 pinsZowie Technology
- What it is
- Zener diode
- Maker
- Zowie Technology
- Package
- SOD-523
- Pins
- 2
- Details
- Zener diode: 25.1..28.9V, Izt=2mA, Zzt=80, 200mW
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
PZU2.4BA / DGSOD-323Zener diode, 2 pins, NXPZener diodeSOD-3232 pinsNXP
- What it is
- Zener diode
- Maker
- NXP
- Package
- SOD-323
- Pins
- 2
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
PZU2.4BA/DGSOD-323Zener diode, 2 pins, NXPZener diodeSOD-3232 pinsNXP
- What it is
- Zener diode
- Maker
- NXP
- Package
- SOD-323
- Pins
- 2
- Details
- Zener diode: 2.3..2.6V, Zzt=100(Iz=5mA), 320mW, H-free
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
R1210N582CSOT-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, 5,8V, 100KHz
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
R3111Q581CSOT-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 5,8V±2.0%, Reset Open drain output
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
R5325N008ASOT-23-66 pins, Nisshinbo Micro DevicesNot recordedSOT-23-66 pinsNisshinbo Micro Devices
- What it is
- Not recorded
- Maker
- Nisshinbo Micro Devices
- Package
- SOT-23-6
- Pins
- 6
- Details
- VR-IC: LDO, Dual out, sep. CE, Vo1=1.2V, Vo2=1.2V, 150mA
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
RT9198-39PBGSOT-23-55 pins, RichtekNot recordedSOT-23-55 pinsRichtek
- What it is
- Not recorded
- Maker
- Richtek
- Package
- SOT-23-5
- Pins
- 5
- Details
- Voltage regulator
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
SZBZX84C22LT1GSOT-23Zener diode, 3 pins, onsemiZener diodeSOT-233 pinsonsemi
- What it is
- Zener diode
- Maker
- onsemi
- Package
- SOT-23
- Pins
- 3
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
3 more parts have no package on record
KRC841EKECNot recordedNot recordedNot recordedKEC
- What it is
- Not recorded
- Maker
- KEC
- Package
- Not recorded
- Pins
- Not recorded
- Details
- NPN transistor: Dual, Sw, 50V, 100mA, 200mW, R1/R2=47k/10k
- Source
- Published code list
Is it dead? The meter test is below: Bipolar transistor.
KRC841UKECNot recordedNot recordedNot recordedKEC
- What it is
- Not recorded
- Maker
- KEC
- Package
- Not recorded
- Pins
- Not recorded
- Details
- NPN transistor: Dual, Sw, 50V, 100mA, 200mW, R1/R2=47k/10k
- Source
- Published code list
Is it dead? The meter test is below: Bipolar transistor.
R1163D381DNisshinbo Micro DevicesNot recordedNot recordedNot recordedNisshinbo Micro Devices
- What it is
- Not recorded
- Maker
- Nisshinbo Micro Devices
- Package
- Not recorded
- Pins
- Not recorded
- Details
- VR-IC: LDO, CE, auto-discharge, 3.8V±1.5%, 150mA
- 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.
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.
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.
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.
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.
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