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STMICROELECTRONICS BD438 Power Transistor

The BD438 is a silicon epitaxial-base PNP power transistor designed for medium power linear and switching applications. With a Jedec SOT-32 plastic package, it is suitable for use in various electronic circuits, offering reliable performance with collector-emitter voltages up to 45 V and collector currents of 4 A. This transistor features a maximum power dissipation of 36 W, a junction temperature up to 150°C, and thermal resistances of 3.5°C/W junction-case and 100°C/W junction-ambient. It provides stable switching and amplification capabilities ideal for industrial and automotive electronics.

Authorized Distributors
Source:Newark
Part No:BD438
Stock:2496
Inv Date:06-11-2026
Price: Unit price: $0.432
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Source:Newark
Part No:BD438
Stock:2489
Inv Date:06-11-2026
Price: Unit price: $0.659
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Source:DigiKey
Part No:BD438
Stock:4985
Inv Date:06-11-2026
Price: Unit price: $1.67
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Part No:BD438
Stock:8615
Inv Date:06-12-2026
Price: Unit price: $0.76
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Part No:BD438
Stock:0
Inv Date:06-12-2026
Price: N/A
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Part No:BD438
Stock:0
Inv Date:06-11-2026
Price: Unit price: $0.41
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Part No:BD438
Stock:0
Inv Date:06-11-2026
Price: Unit price: $0.157
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Source:Arrow EU
Part No:BD438
Stock:87698
Inv Date:06-12-2026
Price: N/A
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Part No:BD438
Stock:7900
Inv Date:06-12-2026
Price: N/A
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STMICROELECTRONICS BD438 Power Transistor Specifications:

  • Collector-Base Voltage: 22 to 45 V
  • Collector-Emitter Voltage: 22 to 45 V
  • Collector Peak Current: 7 A
  • Collector Continuous Current: 4 A
  • Emitter-Base Voltage: 5 V
  • Total Dissipation at T<25°C: 36 W
  • Maximum Operating Junction Temperature: 150°C
  • Thermal Resistance Junction-Case: Max 3.5°C/W
  • Thermal Resistance Junction-Ambient: Max 100°C/W
  • Voltage Ratings: Vcbo and Vces vary from 22 V to 45 V depending on model
  • Saturation Voltage: 0.2 to 0.6 V
  • DC Current Gain: 30 to 130
  • Transition Frequency: 3 MHz

Buy the STMicroelectronics Series Power Transistor: BD438

Order the STMicroelectronics BD438 power transistor online to ensure high-performance switching and linear operation in your electronic projects. Featuring a max voltage of 45 V and collector current of 4 A, this SOT-32 package device is ideal for medium power applications in automotive and industrial systems. With a maximum dissipation of 36 W and a maximum junction temperature of 150°C, it offers excellent thermal stability and durability. Purchase today for precise control and dependable long-lasting performance.

Get STMicroelectronics BD438 today—built for reliable switching and amplification in industrial and automotive electronics.

Frequently Asked Questions

Where can I buy STMICROELECTRONICS BD438?

You can click on the BUY or RFQ button to purchase BD438 from an authorized STMICROELECTRONICS distributor.

How do I troubleshoot issues or seek technical support for part BD438?

You can download the BD438 datasheet or visit the STMICROELECTRONICS website for support.

Who is the manufacturer of BD438?

STMICROELECTRONICS

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