SMD code J8- in SOT-23
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.
32 parts in SOT-23 are printed J8-
Not sure which one you have?
Answer up to 4 quick questions and these 45 parts are ranked, with a meter test that settles it. It works on a dead part too.
RT9818C-23PVLSOT-23Voltage supervisor, RichtekVoltage supervisorRichtek
- What it is
- Voltage supervisor
- Maker
- Richtek
- Package
- SOT-23
- Pins
- 3
- Details
- Voltage Detector
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
S9018LT1SOT-23Weitron TechnologyNot recordedWeitron Technology
- What it is
- Not recorded
- Maker
- Weitron Technology
- Package
- SOT-23
- Pins
- 3
- Details
- Si-npn: GP, 25V, 50mA, 200mW, B=70..190, >600MHz
- Source
- Published code list
Is it dead? The meter test is below: This part.
13 more parts have no package on record. Nothing rules them out, so they stay.
BZT52C6V2KZener diode, Taiwan SemiconductorZener diodeTaiwan Semiconductor
- What it is
- Zener diode
- Maker
- Taiwan Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
FAN48630UC50XDC-DC converter, onsemiDC-DC converteronsemi
- What it is
- DC-DC converter
- Maker
- onsemi
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Synchronous Regulator with Bypass Mode, , TINYBOOST 2.5 MHz, 1500 mA
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Integrated circuit.
HFCN-2275+RF filter, Mini-CircuitsRF filterMini-Circuits
- What it is
- RF filter
- Maker
- Mini-Circuits
- Package
- Not recorded
- Pins
- Not recorded
- Details
- LTCC filter, 2450-7000 MHz
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: This part.
MM5Z6V2-Q1Zener diode, Formosa MicrosemiZener diodeFormosa Microsemi
- What it is
- Zener diode
- Maker
- Formosa Microsemi
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
AP8821N-18GIVoltage supervisor, Anwell SemiconductorVoltage supervisorAnwell Semiconductor
- What it is
- Voltage supervisor
- Maker
- Anwell Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 1.8V±2%, -Reset ODO, H-free
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
AP8821N-18GSVoltage supervisor, Anwell SemiconductorVoltage supervisorAnwell Semiconductor
- What it is
- Voltage supervisor
- Maker
- Anwell Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 1.8V±2%, -Reset ODO, H-free
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
AP8821N-18PIVoltage supervisor, Anwell SemiconductorVoltage supervisorAnwell Semiconductor
- What it is
- Voltage supervisor
- Maker
- Anwell Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 1.8V±2%, -Reset ODO
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
AP8821N-18PSVoltage supervisor, Anwell SemiconductorVoltage supervisorAnwell Semiconductor
- What it is
- Voltage supervisor
- Maker
- Anwell Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 1.8V±2%, -Reset ODO
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
EC95808N18C7IVoltage supervisor, E-CMOSVoltage supervisorE-CMOS
- What it is
- Voltage supervisor
- Maker
- E-CMOS
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 1.8V±2%, -Reset ODO
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
EC95808N18C7SVoltage supervisor, E-CMOSVoltage supervisorE-CMOS
- What it is
- Voltage supervisor
- Maker
- E-CMOS
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 1.8V±2%, -Reset ODO
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
KRA741EKECNot recordedKEC
- What it is
- Not recorded
- Maker
- KEC
- Package
- Not recorded
- Pins
- Not recorded
- Details
- PNP transistor: Dual, Sw, 50V, 100mA, 200mW, R1/R2=47k/10k
- Source
- Published code list
Is it dead? The meter test is below: Bipolar transistor.
KRA741UKECNot recordedKEC
- What it is
- Not recorded
- Maker
- KEC
- Package
- Not recorded
- Pins
- Not recorded
- Details
- PNP transistor: Dual, Sw, 50V, 100mA, 200mW, R1/R2=47k/10k
- Source
- Published code list
Is it dead? The meter test is below: Bipolar transistor.
RN1969FSToshibaNot recordedToshiba
- What it is
- Not recorded
- Maker
- Toshiba
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Si-npn-Digi: Dual, Sw, 20V, 50mA, 50mW, 250MHz, R1/R2=47k/22k
- 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.
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.
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.
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.
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