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STMICROELECTRONICS STD840DN40 High Voltage Power Transistor

The STD840DN40 is a dual NPN high voltage power transistor featuring multi-epitaxial planar technology housed in a dual-island DIP-8 package. Designed for electronic ballast applications and compact fluorescent lamp circuits, it offers high collector-base and collector-emitter voltages, fast switching speeds, and a low saturation voltage. With a collector current of 4 A and a maximum junction temperature of 150°C, it is suitable for high-voltage, high-current switching tasks. Its robust thermal and electrical characteristics ensure reliable operation in demanding electronic lighting and ballast systems.

Authorized Distributors
Part No:STD840DN40
Stock:0
Inv Date:06-12-2026
Price: N/A
Buy/RFQ:

STMICROELECTRONICS STD840DN40 High Voltage Power Transistor Specifications:

  • Collector-base voltage: 700 V
  • Collector-emitter voltage: 400 V
  • Emitter-base voltage: 18 V
  • Collector current: 4 A
  • Peak collector current: 8 A
  • Base current: 15 A
  • Total dissipation at 25°C: 3 W
  • Maximum junction temperature: 150°C
  • Thermal resistance junction-ambient: 42 °C/W
  • Thermal resistance junction-case: 27 °C/W
  • Storage temperature: -65 to 150°C
  • Package: DIP-8
  • Package dimensions and mechanical data as per standard DIP-8 specifications

Buy the ST Series STD840DN40 High Voltage Transistor: STD840DN40

Order the STD840DN40 high voltage power transistor online to ensure reliable and efficient operation in high-voltage switching applications such as electronic ballast systems and compact fluorescent lamps. This dual NPN transistor offers a collector-base voltage of up to 700 V and a collector current of 4 A, making it suitable for demanding lighting and electronic ballast environments. Its robust construction guarantees durability, fast switching speed, and thermal stability, ensuring optimal performance for professional and industrial use. Purchase now for quick delivery and enhanced system reliability.

Buy ST Series STD840DN40 high voltage transistor now and experience unmatched reliability and performance in electronic ballast and CFL circuits.

Frequently Asked Questions

Where can I buy STMICROELECTRONICS STD840DN40?

You can click on the BUY or RFQ button to purchase STD840DN40 from an authorized STMICROELECTRONICS distributor.

How do I troubleshoot issues or seek technical support for part STD840DN40?

You can download the STD840DN40 datasheet or visit the STMICROELECTRONICS website for support.

Who is the manufacturer of STD840DN40?

STMICROELECTRONICS

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