SMD code A4t
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, t, is lower case, which on NXP and Philips parts is a date or factory code, so it was set aside and A4 was searched.
244 parts are printed A4t
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.
1N4004WSOD-123FRectifier, 2 pins, Blue RocketRectifierSOD-123F2 pinsBlue Rocket
- What it is
- Rectifier
- Maker
- Blue Rocket
- Package
- SOD-123F
- Pins
- 2
- Details
- Rectifier diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
1N4150WSOD-123Switching diode, 2 pins, Taitron ComponentsSwitching diodeSOD-1232 pinsTaitron Components
- What it is
- Switching diode
- Maker
- Taitron Components
- Package
- SOD-123
- Pins
- 2
- Details
- 0.2A, 50V, Surface Mount Small Signal Switching Diodes
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
1SS184SOT-23Switching diode, 3 pins, Formosa MicrosemiSwitching diodeSOT-233 pinsFormosa Microsemi
- What it is
- Switching diode
- Maker
- Formosa Microsemi
- Package
- SOT-23
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
ABAV70-HFSOT-23Switching diode, 3 pins, ComchipSwitching diodeSOT-233 pinsComchip
- What it is
- Switching diode
- Maker
- Comchip
- Package
- SOT-23
- Pins
- 3
- Details
- 75 V, 150 mA switching diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
ACDST-70-HFSOT-23Switching diode, 3 pins, ComchipSwitching diodeSOT-233 pinsComchip
- What it is
- Switching diode
- Maker
- Comchip
- Package
- SOT-23
- Pins
- 3
- Details
- 70 V, 200 mA switching diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
ACGRTS4004-HFSOD-123FRectifier, 2 pins, ComchipRectifierSOD-123F2 pinsComchip
- What it is
- Rectifier
- Maker
- Comchip
- Package
- SOD-123F
- Pins
- 2
- Details
- 400 V, 1 A rectifier
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
BAT760SOD-323Schottky diode, 2 pins, NexperiaSchottky diodeSOD-3232 pinsNexperia
- What it is
- Schottky diode
- Maker
- Nexperia
- Package
- SOD-323
- Pins
- 2
- Details
- Medium power Schottky barrier single diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
BAV70SOT-23Switching diode, 3 pins, InfineonSwitching diodeSOT-233 pinsInfineon
- What it is
- Switching diode
- Maker
- Infineon
- Package
- SOT-23
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
BAV70-CSOT-23Switching diode, 3 pins, SeCoSSwitching diodeSOT-233 pinsSeCoS
- What it is
- Switching diode
- Maker
- SeCoS
- Package
- SOT-23
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
BAV70-HFSOT-23Switching diode, 3 pins, ComchipSwitching diodeSOT-233 pinsComchip
- What it is
- Switching diode
- Maker
- Comchip
- Package
- SOT-23
- Pins
- 3
- Details
- 70 V, 200 mA switching diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
BAV70,215SOT-23Switching diode, 3 pins, HXYSwitching diodeSOT-233 pinsHXY
- What it is
- Switching diode
- Maker
- HXY
- Package
- SOT-23
- Pins
- 3
- Details
- Switching diode, 70 V, 0.2 A
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
BAV70DWSOT-363Switching diode, 6 pins, DiotecSwitching diodeSOT-3636 pinsDiotec
- What it is
- Switching diode
- Maker
- Diotec
- Package
- SOT-363
- Pins
- 6
- Details
- SMD Small Signal Diode Arrays
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
BAV70DXV6SOT-563Switching diode, 6 pins, onsemiSwitching diodeSOT-5636 pinsonsemi
- What it is
- Switching diode
- Maker
- onsemi
- Package
- SOT-563
- Pins
- 6
- Details
- Monolithic Dual Switching Diode Common Cathode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
BAV70GPSOT-23Switching diode, 3 pins, ChenmkoSwitching diodeSOT-233 pinsChenmko
- What it is
- Switching diode
- Maker
- Chenmko
- Package
- SOT-23
- Pins
- 3
- Details
- SWITCHING DIODE, 75 V, 0.15 A
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
BAV70HSOT-23Switching diode, 3 pins, Taiwan SemiconductorSwitching diodeSOT-233 pinsTaiwan Semiconductor
- What it is
- Switching diode
- Maker
- Taiwan Semiconductor
- Package
- SOT-23
- Pins
- 3
- 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.
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.
Printed with a code easy to misread as A4t
One character differs, and it is one that is easy to confuse under a lamp. Each code has a page of its own.
Codes that begin with A4t
For a marking with its end worn or burnt off. Each code has a page of its own.
Codes not listed here are printed on 517 more parts.
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