BLD128D Datasheet – 400V, 5A, NPN Transistor, TO-220

This post explains for the transistor.

The Part Number is BLD128D.

The function of this semiconductor is 400V, 5A, NPN Transistor.

The package is TO-220 Type

Manufacturer: SI Semiconductors


BLD128D datasheet pdf


This is Silicon NPN transistor in a TO-220 Plastic Package.


1. High voltage capability, high speed switching, wide SOA,ROHS compliant


Absolute maximum ratings ( Ta=25°C )

1. Collector to Base Voltage: Vcbo = 700 V

2. Collector to Emitter Voltage: Vceo = 400 V

3. Emitter to Base Voltage: Vebo = 9 V

4. Collector Current: Ic = 5 A

5. Collector Dissipation : Pc = 2W

6. Junction Temperature: Tj = 150°C

7. Storage Temperature: Tsg = -55 ~ +150°C



Fluorescent lamp, electronics ballast, electronic transformer, switch mode power supply .


2 page

BLD128D Datasheet