SMD code A7-
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.
265 parts are printed A7-
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.
TPS3831G33DQNX2SONVoltage supervisor, 4 pins, Texas InstrumentsVoltage supervisorX2SON4 pinsTexas Instruments
- What it is
- Voltage supervisor
- Maker
- Texas Instruments
- Package
- X2SON
- Pins
- 4
- Details
- 150-nA, Ultralow Power, Supply Voltage Monitor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Integrated circuit.
BAV99DWSOT-363Switching diode, 6 pins, YFWSwitching diodeSOT-3636 pinsYFW
- What it is
- Switching diode
- Maker
- YFW
- Package
- SOT-363
- Pins
- 6
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
BAV99N3SOT-23Switching diode, 3 pins, CYStekSwitching diodeSOT-233 pinsCYStek
- What it is
- Switching diode
- Maker
- CYStek
- Package
- SOT-23
- Pins
- 3
- Details
- 110 V switching diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
BAV99S3SOT-323Switching diode, 3 pins, CYStekSwitching diodeSOT-3233 pinsCYStek
- What it is
- Switching diode
- Maker
- CYStek
- Package
- SOT-323
- Pins
- 3
- Details
- 110 V switching diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
DAN217SOT-23Switching diode, 3 pins, YFWSwitching diodeSOT-233 pinsYFW
- What it is
- Switching diode
- Maker
- YFW
- Package
- SOT-23
- Pins
- 3
- Details
- 0.1A, 80V, Surface Mount Small Signal Switching Diodes
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
DAN217S3SOT-323Switching diode, 3 pins, CYStekSwitching diodeSOT-3233 pinsCYStek
- What it is
- Switching diode
- Maker
- CYStek
- Package
- SOT-323
- Pins
- 3
- Details
- 110 V switching diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
MMBD7000SOT-23Switching diode, 3 pins, YFWSwitching diodeSOT-233 pinsYFW
- What it is
- Switching diode
- Maker
- YFW
- Package
- SOT-23
- Pins
- 3
- Details
- 0.2A, 100V, Surface Mount Small Signal Switching Diodes
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
1SS123SOT-233 pins, NEC ElectronicsNot recordedSOT-233 pinsNEC Electronics
- What it is
- Not recorded
- Maker
- NEC Electronics
- Package
- SOT-23
- Pins
- 3
- Details
- Si-diode: Dual, Sw, Fast, 70V, 100mA, Vf<1,3V(100mA), <9ns
- Source
- Published code list
Is it dead? The meter test is below: Silicon diode.
1SS226SOT-23Switching diode, 3 pins, Semtech ElectronicsSwitching diodeSOT-233 pinsSemtech Electronics
- What it is
- Switching diode
- Maker
- Semtech Electronics
- Package
- SOT-23
- Pins
- 3
- Details
- 0.1A, 80V, Surface Mount Small Signal Switching Diodes
- Source
- Published code list
Is it dead? The meter test is below: Silicon diode.
1SS402SOT-143Schottky diode, 4 pins, ToshibaSchottky diodeSOT-1434 pinsToshiba
- What it is
- Schottky diode
- Maker
- Toshiba
- Package
- SOT-143
- Pins
- 4
- Details
- Si-diode: Dual, Schottky, 20V, 50mA
- Source
- Published code list
Is it dead? The meter test is below: Schottky diode.
1SS405SOD-523Schottky diode, 2 pins, ToshibaSchottky diodeSOD-5232 pinsToshiba
- What it is
- Schottky diode
- Maker
- Toshiba
- Package
- SOD-523
- Pins
- 2
- Details
- SMD Small Signal Schottky Diodes
- Source
- Published code list
Is it dead? The meter test is below: Schottky diode.
10SMBJ7.0ASMBTVS diode, 2 pins, UN SemiconductorTVS diodeSMB2 pinsUN Semiconductor
- What it is
- TVS diode
- Maker
- UN Semiconductor
- Package
- SMB
- Pins
- 2
- Details
- Transient voltage supressor: Vrwm=7.0V, Vbr=7.78..8.60V, Ipp=83.4A, 1000W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
3 more parts have no package on record
1SS406Switching diode, ToshibaSwitching diodeNot recordedNot recordedToshiba
- What it is
- Switching diode
- Maker
- Toshiba
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Diode: Hi-sp, Sw., 20V, 50mA, Vf=0.5V(50mA)
- Source
- Published code list
Is it dead? The meter test is below: Silicon diode.
74AUP1T57GFNXPNot recordedNot recordedNot recordedNXP
- What it is
- Not recorded
- Maker
- NXP
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS logic IC: Configurable gate with voltage-level translator
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
74AUP1T57GMNXPNot recordedNot recordedNot recordedNXP
- What it is
- Not recorded
- Maker
- NXP
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS logic IC: Configurable gate with voltage-level translator
- 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.
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.
Silicon diode
Diode range, part lifted or one leg off the pad. Red probe on the anode.
Working, it reads
About 0.5 to 0.8 V anode to cathode, and open the other way. Small switching diodes read about 0.6 to 0.7 V; large rectifiers can read a little lower.
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: failed open.
- A reading the wrong way round as well: 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 three-pin body can hold two diodes. With a common pin they read two junctions from that pin, just like a transistor; in series they read two drops end to end. Test each pair the datasheet names.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Schottky diode
Diode range, part lifted or one leg off the pad. Red probe on the anode.
Working, it reads
About 0.15 to 0.45 V anode to cathode, roughly half a silicon diode, and open the other way.
Dead, it reads
- The same reading both ways round, near 0 V with a continuous beep or the same middling value: shorted.
- A reading the wrong way round as well: leaky.
- Open both ways: failed open.
- 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 large Schottky can read about 0.1 V forward and beep like a short, and leaks a little the wrong way when good, more when warm. It is shorted only if it reads the same both ways. Measure it cold, beside an identical cold one.
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.
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