MJE340 NPN Bipolar Power Transistor 300V 500mA TO-126 Package

MJE340 NPN Bipolar Power Transistor 300V 500mA TO-126 Package

The MJE340 is a high-voltage, medium-current NPN bipolar power transistor designed for switching and amplification applications. With a collector-emitter voltage of 300V and a collector current of 500mA, it offers high voltage handling, reliable performance, and good thermal stability.

Housed in a TO-126 package, the MJE340 provides efficient heat dissipation and easy PCB mounting, making it suitable for audio and industrial amplifiers, voltage regulators, relay drivers, and general-purpose high-voltage switching circuits. Its robust construction ensures reliable operation in moderate-power high-voltage applications.

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Features:

• Transistor Type: NPN Bipolar Power Transistor
• Package: TO-126 (compact, thermally efficient)
• Collector-Emitter Voltage (V_CE): 300V
• Collector Current (I_C): 500mA
• Power Dissipation (P_tot): Up to 12.5W (with proper heatsink)
• DC Current Gain (hFE): 40–160 (typical)
• High Voltage Handling: Suitable for high-voltage switching
• Thermally Stable: Reliable under moderate load and temperature
• Durable Construction: Long-term stable operation in medium-power circuits

Applications:

• High-Voltage Amplifiers: Medium-power amplification with high voltage
• Voltage Regulators & Power Supplies: Stable medium-current regulation
• Relay & Solenoid Drivers: High-voltage switching applications
• Industrial Switching Circuits: Reliable control of moderate loads
• Audio Amplifiers: Medium-power audio stages
• Educational & Hobby Projects: High-voltage electronics experiments
• General-Purpose Amplification: Medium-power high-voltage signal amplification

mje340-transistor-datasheet