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STMICROELECTRONICS MJE340 Power Transistor

The MJE340 is a medium power silicon planar NPN transistor designed for linear and switching applications, mounted in SOT-32 package. It features collector-base and collector-emitter voltages of 300 V, a collector current of 0.5 A, and total dissipation of 20.8 W at 25°C. Its thermal resistance junction-case is 6.0 °C/W. Ideal for industrial automation, power regulation, and switching circuits, this transistor provides reliable performance with high voltage and current ratings, making it suitable for various electronic and control systems in industrial environments.

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Source:Newark
Part No:MJE340
Stock:579
Inv Date:06-11-2026
Price: Unit price: $0.516
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Part No:MJE340
Stock:6592
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Price: Unit price: $1.16
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Source:DigiKey
Part No:MJE340
Stock:1280
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Price: Unit price: $2.1
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Source:DigiKey
Part No:MJE340
Stock:1473
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Price: Unit price: $2.07
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Part No:MJE340
Stock:4117
Inv Date:06-12-2026
Price: Unit price: $1.22
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Part No:MJE340
Stock:0
Inv Date:06-11-2026
Price: Unit price: $0.58
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Part No:MJE340
Stock:83
Inv Date:06-11-2026
Price: Unit price: $0.162
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Part No:MJE340
Stock:83
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Price: Unit price: $0.162
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Authorized Distributors
Part No:MJE340
Stock:14331
Inv Date:06-11-2026
Price: Unit price: $0.162
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Source:Arrow EU
Part No:MJE340
Stock:34126
Inv Date:06-12-2026
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Part No:MJE340
Stock:26178
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STMICROELECTRONICS MJE340 Power Transistor Specifications:

  • Collector-base voltage: 300 V
  • Collector-emitter voltage: 300 V
  • Base-emitter voltage: 3 V
  • Collector current: 0.5 A
  • Total dissipation: 20.8 W at 25°C
  • Storage temperature: -65 to 150°C
  • Maximum junction temperature: 150°C
  • Thermal resistance junction-case: 6.0 °C/W
  • Package: SOT-32
  • Mounting type: Surface-mount casing suitable for industrial environments
  • Typical switching and linear operation in power electronics applications

Buy the STMicroelectronics MJE340 – Reliable Silicon Power Transistor for Industrial Applications

Order the STMicroelectronics MJE340 online now and enjoy high voltage and current ratings essential for industrial control, switching, and linear power applications. This reliable power transistor in SOT-32 package ensures optimal performance with 300V collector-emitter voltage and 0.5A collector current. Its robust design supports industrial automation, power regulation, and switching systems, delivering high efficiency and durability. Purchase easily online and enhance your electronic projects with trusted semiconductor components tailored for demanding industrial environments.

Get STMicroelectronics MJE340 today—built for precision and long-lasting durability in power switching and linear circuits.

Frequently Asked Questions

Where can I buy STMICROELECTRONICS MJE340?

You can click on the BUY or RFQ button to purchase MJE340 from an authorized STMICROELECTRONICS distributor.

How do I troubleshoot issues or seek technical support for part MJE340?

You can download the MJE340 datasheet or visit the STMICROELECTRONICS website for support.

Who is the manufacturer of MJE340?

STMICROELECTRONICS

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