What A4 can be
A4BAV70Dual switching diodeSOT-23 · Nexperia · 100 V · 215 mA
Pins: 1=A1 2=A2 3=K
On the part, one more character can follow A4: a date or factory code. datasheet
A4BAV70WDual switching diodeSOT-323 · Nexperia · 100 V · 175 mA
Pins: 1=A1 2=A2 3=K
On the part, one more character can follow A4: a date or factory code. datasheet
Package size
| Package | Also called | Body | Height |
|---|---|---|---|
| SOT-23 | TO-236AB, SOT-23-3 | 2.9 × 1.3 mm | 1 mm |
| SOT-323 | SC-70, SC-70-3 | 2 × 1.25 mm | 0.95 mm |
| SOD-323 | SC-76, SOD323 | 1.7 × 1.25 mm | 0.9 mm |
Nominal body size without the leads.
How to tell them apart
Measure the plastic body without the leads: SOT-23 2.9 × 1.3 mm · SOT-323 2 × 1.25 mm · SOD-323 1.7 × 1.25 mm.
Look at where it sits: a small part next to a USB connector is often ESD protection or a Schottky diode; a 3- or 5-pin part near the power input is often a regulator.
The same code can mean different parts at different makers. The package narrows it down, so measure the body.
Open the SMD identifier →Not sure it is this part? Enter the marking with the shape and size of the body: the identifier checks it against all 340 markings in the database.
Frequently asked questions
What is the pinout of SMD code A4?
BAV70 (SOT-23): 1=A1 2=A2 3=K. BAV70W (SOT-323): 1=A1 2=A2 3=K. BAT760 (SOD-323): 1=K 2=A; band = cathode.
Marking codes checked against the makers’ datasheets; each part links to its own.