What 2A can be
2APMBT3906PNP transistorSOT-23 · Nexperia · 40 V · 200 mA · hFE 100-300
Pins: 1=B 2=E 3=C
On the part, one more character can come before 2A: a factory code. datasheet
2ASi2302ADSN-channel MOSFETSOT-23 · Vishay · 20 V · 2.4 A · RDS(on) 60 mΩ at 4.5 V
Pins: 1=G 2=S 3=D
Package size
| Package | Also called | Body | Height |
|---|---|---|---|
| SOT-23 | TO-236AB, SOT-23-3 | 2.9 × 1.3 mm | 1 mm |
Nominal body size without the leads.
How to tell them apart
A multimeter in diode mode tells transistors apart: an NPN shows about 0.6–0.7 V from the base to both other pins with the red probe on the base; a PNP does the same with the black probe on the base.
In diode mode a MOSFET shows only its body diode, between source and drain and in one direction; nothing answers from the gate.
With the same package and code, look at how the part is used in the circuit and compare it with the ratings above.
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.
Related parts and their markings
Frequently asked questions
What is the pinout of SMD code 2A?
PMBT3906 (SOT-23): 1=B 2=E 3=C. Si2302ADS (SOT-23): 1=G 2=S 3=D.
Marking codes checked against the makers’ datasheets; each part links to its own.