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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
3
FLUORESCENT LIGHTING 2
1
SWITCH MODE POWER SUPPLIES
TO-220
Description
The BU505 is a High Voltage NPN fastswitching
transistor designed to be used in lighting
application, like electronic ballast for fluorescent Internal Schematic Diagram
lamps.
It's characteristics make also ideal for power
supplies.

Order Codes

Part Number Marking Package Packing

BU505 BU505 TO-220 TUBE

rev.4
August 2005 1/10
www.st.com 10
1 Absolute Maximum Ratings BU505

1 Absolute Maximum Ratings

Table 1. Absolute Maximum Rating
Symbol Parameter Value Unit
VCES Collector-Emitter Voltage (VBE = 0) 1500 V
VCEO Collector-Emitter Voltage (IB = 0) 700 V
IC Collector Current 2.5 A
ICM Collector Peak Current (tP < 5ms) 4 A
IB Base Current 1 A
IBM Base Peak Current (tP < 5ms) 2 A
PTOT Total dissipation at Tc = 25