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BD437 ST Bipolar (BJT)

The BD437 is an NPN bipolar power transistor from STMicroelectronics in TO-126 (SOT-32) through-hole package, featuring 45V collector-emitter voltage and 4A continuous collector current for medium-power switching and linear applications. For selection, verify collector-emitter saturation voltage for conduction losses, DC current gain (hFE) characteristics, transition frequency for switching speed, power dissipation with proper heatsinking, and operating junction temperature from -65°C to +150°C. Features include complementary PNP type BD438 for push-pull designs, rugged reliability, and through-hole package for robust mounting. Ideal for power amplifier output stages, DC motor drivers, relay and solenoid drivers, linear regulators, switching regulators, and industrial power control applications. In stock at HL Electronics – request a quote for fast delivery.

BD437 - ST - main product image
Part No.:BD437
Brand:ST
Date Code:
Stock:3,000
SPQ:0
MOQ:1+
Delivery Time:In Stock

Pricing (USD)

QuantityUnit Price
1+ $ 0.49
100+ $ 0.41
1000+ $ 0.37
2000+ $ 0.35

Technical Specifications

  • Part No.BD437
  • Model BD437
  • Category Discrete Semiconductor Products > Transistors > Bipolar (BJT)
  • Manufacturer STMicroelectronics
  • Packaging Tube
  • Part Status Active
  • Transistor Type NPN
  • Current - Collector (Ic) (Max) 4 A
  • Voltage - Collector Emitter Breakdown (Max) 45 V
  • Vce Saturation (Max) @ Ib, Ic 0.6V @ 200mA, 2A
  • Current - Collector Cutoff (Max) 100 µA
  • DC Current Gain (hFE) (Min) @ Ic, Vce 40 @ 2A, 1V
  • Power - Max 36 W
  • Frequency - Transition 3 MHz
  • Operating Temperature 150°C (TJ)
  • Mounting Type Through Hole
  • Supplier Device Package SOT-32-3 (TO-126)
  • Base Product Number BD437
  • RoHS ROHS3 Compliant
  • Standard Package 1000
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