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.
MJE340 Pinout
Pin Configuration
| Pin No | Pinout |
|---|---|
| 1 | Emitter |
| 2 | Collector |
| 3 | Base |
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.
TIP 31 Transistor
- NPN
- Voltage Rating: 40V
- Current Rating: 3A
- Suitable for higher current applications, but with a lower voltage rating.
Applications
The MJE340 and MJE350 are the complementary pair of transistors. these transistors are mainly used in different electronic circuits like,
- Amplifier driver stage
- Inverter Totem pole circuit
- Relay driver board
- LED circuits
- Arduino project
Also, Check this
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- 4.6 watt Stereo Audio amplifier Circuit using 6283 IC
FAQ
The voltage referred to as the collector-emitter voltage is around 300V
TIP 31 and BD139 are the equivalent transistors, the voltage is different, so consider this before connecting any power supply.
