August 2005

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BU505

High Voltage NPN Multiepitaxial

Fast-Switching Transistor

Features

■

HIGH VOLTAGE CAPABILITY

■

VERY HIGH SWITCHING SPEED

■

HIGH RUGGEDNESS

Applications

■

ELECTRONIC BALLASTS FOR

FLUORESCENT LIGHTING

■

SWITCH MODE POWER SUPPLIES

Description

The BU505 is a High Voltage NPN fastswitching

transistor

designed

to

be

used

in

lighting

application, like electronic ballast for fluorescent

lamps.

It’s characteristics make also ideal for power

supplies.

Order Codes

Internal Schematic Diagram

1

2

3

TO-220

Part Number

Marking

Package

Packing

BU505

BU505

TO-220

TUBE

www.st.com

rev.4