SMD code 12-
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.
194 parts are printed 12-
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.
UDZV2.2BSOD-323Zener diode, 2 pins, ROHMZener diodeSOD-3232 pinsROHM
- What it is
- Zener diode
- Maker
- ROHM
- Package
- SOD-323
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
UDZVFH2.2BSOD-323Zener diode, 2 pins, ROHMZener diodeSOD-3232 pinsROHM
- What it is
- Zener diode
- Maker
- ROHM
- Package
- SOD-323
- Pins
- 2
- Details
- Zener Diode (AEC-Q101 qualified)
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
WE12D5SOD-523ESD protection diode, 2 pins, WayonESD protection diodeSOD-5232 pinsWayon
- What it is
- ESD protection diode
- Maker
- Wayon
- Package
- SOD-523
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
HBCA124ES6RSOT-363Complementary transistor pair (NPN and PNP), 6 pins, CYStekComplementary transistor pair (NPN and PNP)SOT-3636 pinsCYStek
- What it is
- Complementary transistor pair (NPN and PNP)
- Maker
- CYStek
- Package
- SOT-363
- Pins
- 6
- Details
- NPN+PNP digital (resistor-equipped) transistor, R1 22K/22K, R2 22K/22K
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Bipolar transistor pair.
EIA-96:120603Precision resistor (EIA-96 code), 2 pinsPrecision resistor (EIA-96 code)06032 pinsNot recorded
- What it is
- Precision resistor (EIA-96 code)
- Maker
- Not recorded
- Package
- 0603
- Pins
- 2
- Details
- EIA-96 precision chip resistor, code 12 stands for 130 in the E96 table; the printed mark adds a multiplier letter (12A = 130 Ohm, 12B = 1.3 kOhm)
- Source
- Added by hand from a published table
Is it dead? The meter test is below: Resistor.
7UL1T08FSSOT-9535 pins, ToshibaNot recordedSOT-9535 pinsToshiba
- What it is
- Not recorded
- Maker
- Toshiba
- Package
- SOT-953
- Pins
- 5
- Details
- CMOS logic IC: 2-input AND gate with level shifting
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
7UL1T08FUSOT-3535 pins, ToshibaNot recordedSOT-3535 pinsToshiba
- What it is
- Not recorded
- Maker
- Toshiba
- Package
- SOT-353
- Pins
- 5
- Details
- CMOS logic IC: 2-input AND gate with level shifting
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
AP8822C-52GASOT-23Voltage supervisor, 3 pins, Anwell SemiconductorVoltage supervisorSOT-233 pinsAnwell Semiconductor
- What it is
- Voltage supervisor
- Maker
- Anwell Semiconductor
- Package
- SOT-23
- Pins
- 3
- Details
- Voltage detector IC: 5.2V±2%, -Reset PPO, Rdt=200ms, H-free
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
AP8822C-52GTSOT-323Voltage supervisor, 3 pins, Anwell SemiconductorVoltage supervisorSOT-3233 pinsAnwell Semiconductor
- What it is
- Voltage supervisor
- Maker
- Anwell Semiconductor
- Package
- SOT-323
- Pins
- 3
- Details
- Voltage detector IC: 5.2V±2%, -Reset PPO, Rdt=200ms, H-free
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
6 more parts have no package on record
USFZ12VZener diode, KECZener diodeNot recordedNot recordedKEC
- What it is
- Zener diode
- Maker
- KEC
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
02DZ12XZener diode, ToshibaZener diodeNot recordedNot recordedToshiba
- What it is
- Zener diode
- Maker
- Toshiba
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Zener diode: 11.40..11.93V, Iz=5mA, Zz=15, 200mW
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
02DZ12YZener diode, ToshibaZener diodeNot recordedNot recordedToshiba
- What it is
- Zener diode
- Maker
- Toshiba
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Zener diode: 11.73..12.26V, Iz=5mA, Zz=15, 200mW
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
02DZ12ZZener diode, ToshibaZener diodeNot recordedNot recordedToshiba
- What it is
- Zener diode
- Maker
- Toshiba
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Zener diode: 12.06..12.60V, Iz=5mA, Zz=15, 200mW
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
AP8822C-52GIVoltage supervisor, Anwell SemiconductorVoltage supervisorNot recordedNot recordedAnwell Semiconductor
- What it is
- Voltage supervisor
- Maker
- Anwell Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 5.2V±2%, -Reset PPO, 200ms Rt delay, H-free
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
AP8822C-52GSVoltage supervisor, Anwell SemiconductorVoltage supervisorNot recordedNot recordedAnwell Semiconductor
- What it is
- Voltage supervisor
- Maker
- Anwell Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 5.2V±2%, -Reset PPO, 200ms Rt delay, H-free
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
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.
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.
Bipolar transistor pair
Diode range, part lifted. Test each transistor on its own pins, as the datasheet's pinout gives them.
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.
Resistor
Ohms range, across it, power off.
Working, it reads
Its marked value, within tolerance. On the board it reads the same or lower, because everything around it sits in parallel.
Dead, it reads
- Open: burnt, cracked, or eaten through by sulphur. The commonest failure.
- Well above its marked value: drifted high.
- On the board, clearly higher than its marked value: it has failed, since the board can only pull a reading down.
- On the board:
- A reading lower than marked on the board proves nothing; lift one end. A reading higher than marked is a fault even on the board.
- Compare:
- The same position on another channel usually carries the same value, and so does the matching part on another board.
- Watch for:
- A burnt resistor usually means the part it feeds pulled too much. Find that before fitting a new one, or it burns too. The marking, not the reading, says what to fit.
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.
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