MJE340 Transistor Pinout, Equivalent and Applications

The MJE340 is the most common type of NPN transistor in many electronic circuit boards. in this article, I’m sharing the most important information about the MJE340 Transistor. you will get an idea before building your circuit or replacing the damaged transistor, in this time the Pinout and its equivalent are essential.

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MJE340 Pinout

MJE340 Transistor Pinout — MJE340 NPN bipolar junction transistor pinout

Pin Configuration

Pin No	Pinout
1	Emitter
2	Collector
3	Base

Pin configuration

Features of MJE340 Transistor

Type: NPN Bipolar Junction Transistor
Complementary PNP is MJE350
Medium power transistor.
SOT32 package
Maximum DC collector current 500mA
Collector-Emitter voltage is 300V
Maximum power dissipation 20.8W
Maximum operating temperature 150 degrees Celsius
The type is BJT (Bipolar junction)

Equivalent Transistors

The equivalent transistors are given below if you can not find the MJE340 in the local electronics market, you can replace them with them.

The Common equivalent transistors are 2N5401, TIP31, TIP3055, and BD139. all of these transistors are NPN type of transistors but the pin configuration size and power handling capability are different, let me explain in detail.

2N5401 Transistor

NPN Bipolar junction transistor
voltage rating 60V
Maximum current 1A
Commonly used in similar applications, but has lower power handling capabilities.

BD139 Transistor

NPN transistor
TO 220 Package
BJT Transistor
Voltage rating 80V
Max current 1.5A

TIP3055 Transistor

NPN Transistor
Voltage Rating: 60V
Current Rating: 15A
A high power transistor is often used in amplifiers, but the size is larger than the MJE340.