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BUL128A ST Bipolar (BJT)

The BUL128A is an NPN bipolar power transistor from STMicroelectronics, featuring high voltage capability for offline switching power supply applications. For selection, verify collector-emitter breakdown voltage (VCEO) suitable for offline flyback converters, continuous collector current for primary side switching, DC current gain (hFE) characteristics, collector-emitter saturation voltage for conduction losses, and power dissipation with proper heatsinking. Features include high voltage capability for demanding applications, fast switching speed for high-frequency operation, and rugged reliability. Ideal for offline switching power supplies (SMPS) for AC-DC adapters, flyback converters, battery chargers, LED lighting drivers, and any 400V-500V switching application requiring NPN transistor with medium current capability. In stock at HL Electronics – request a quote for fast delivery.

BUL128A - ST - main product image
Part No.:BUL128A
Brand:ST
Date Code:14+
Stock:2,815
SPQ:0
MOQ:1+
Delivery Time:In Stock

Pricing (USD)

QuantityUnit Price
1+ $ 0.24
50+ $ 0.18
1000+ $ 0.17
20000+ $ 0.17
30000+ $ 0.17

Technical Specifications

  • Part No.BUL128A
  • Model BUL128A
  • 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) 450 V
  • Vce Saturation (Max) @ Ib, Ic 0.8 V
  • Current - Collector Cutoff (Max) 100 µA
  • Power - Max 20 W
  • Operating Temperature 150°C (TJ)
  • Mounting Type Through Hole
  • Supplier Device Package SOT-32-3 (TO-126)
  • Base Product Number BUL128
  • RoHS ROHS3 Compliant
  • Standard Package 50
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