SMD code A7- in SOT-323
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.
26 parts in SOT-323 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.
SCS217FSOT-323Switching diode, SeCoSSwitching diodeSeCoS
- What it is
- Switching diode
- Maker
- SeCoS
- Package
- SOT-323
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
TDAN217USOT-323Switching diode, Galaxy MicroelectronicsSwitching diodeGalaxy Microelectronics
- What it is
- Switching diode
- Maker
- Galaxy Microelectronics
- Package
- SOT-323
- 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.
BAV99S3SOT-323Switching diode, CYStekSwitching diodeCYStek
- 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.
DAN217S3SOT-323Switching diode, CYStekSwitching diodeCYStek
- 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.
BAV99USOT-323ROHMNot recordedROHM
- What it is
- Not recorded
- Maker
- ROHM
- Package
- SOT-323
- Pins
- 3
- Details
- Si-diode: Dual, U-Speed, 80V, 100mA, Vf<1,2V(100mA), 0,5pF, 4ns
- Source
- Published code list
Is it dead? The meter test is below: Silicon diode.
BAV99WPTSOT-323Chenmko EnterpriseNot recordedChenmko Enterprise
- What it is
- Not recorded
- Maker
- Chenmko Enterprise
- Package
- SOT-323
- Pins
- 3
- Details
- Diode: Dual, Sw, 85V, 150mA, Vf<1.25V(150mA), 4ns
- Source
- Published code list
Is it dead? The meter test is below: Silicon diode.
BAV99WT1SOT-323Switching diodeSwitching diodeNot recorded
- What it is
- Switching diode
- Maker
- Not recorded
- Package
- SOT-323
- Pins
- 3
- Source
- Published code list
Is it dead? The meter test is below: Silicon diode.
CH204UPTSOT-323Chenmko EnterpriseNot recordedChenmko Enterprise
- What it is
- Not recorded
- Maker
- Chenmko Enterprise
- Package
- SOT-323
- Pins
- 3
- Details
- Diode: Dual, Sw, 20V, 100mA, Vf<1V(10mA), 4ns
- Source
- Published code list
Is it dead? The meter test is below: Silicon diode.
CH228UPTSOT-323Chenmko EnterpriseNot recordedChenmko Enterprise
- What it is
- Not recorded
- Maker
- Chenmko Enterprise
- Package
- SOT-323
- Pins
- 3
- Details
- Diode: Dual, Sw, 80V, 100mA, Vf<1.2V(100mA), 4ns
- Source
- Published code list
Is it dead? The meter test is below: Silicon diode.
CHN217UPTSOT-323Chenmko EnterpriseNot recordedChenmko Enterprise
- What it is
- Not recorded
- Maker
- Chenmko Enterprise
- Package
- SOT-323
- Pins
- 3
- Details
- Diode: Dual, Sw, 80V, 100mA, Vf<1.2V(100mA), 4ns
- Source
- Published code list
Is it dead? The meter test is below: Silicon diode.
RT9818A-25PU3SOT-323Voltage supervisor, RichtekVoltage supervisorRichtek
- What it is
- Voltage supervisor
- Maker
- Richtek
- Package
- SOT-323
- Pins
- 3
- Details
- Voltage detector
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
4 more parts have no package on record. Nothing rules them out, so they stay.
BZX884B4V3Zener diode, Good-ArkZener diodeGood-Ark
- What it is
- Zener diode
- Maker
- Good-Ark
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Zener diode, VZ 4.3 V, 0.25 W
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
FM4007-LRectifier, Formosa MicrosemiRectifierFormosa Microsemi
- What it is
- Rectifier
- Maker
- Formosa Microsemi
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Rectifier diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
FM4007-L-Q1Rectifier, Formosa MicrosemiRectifierFormosa Microsemi
- What it is
- Rectifier
- Maker
- Formosa Microsemi
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Rectifier diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
FM4007-MHRectifier, Formosa MicrosemiRectifierFormosa Microsemi
- What it is
- Rectifier
- Maker
- Formosa Microsemi
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Rectifier diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon 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.
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.
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.
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.
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