BUF405A
BUF405AFP
HIGH VOLTAGE FAST-SWITCHING
NPN POWER TRANSISTORS
n HIGH SWITCHING SPEED NPN POWER
TRANSISTORS
n EASY TO DRIVE
n HIGH VOLTAGE FOR OFF-LINE
APPLICATIONS
n 100 KHz SWITCHING SPEED
n LOW COST DRIVE CIRCUITS
n LOW DYNAMIC SATURATION
APPLICATIONS:
n SWITCH MODE POWER SUPPLIES
n MOTOR DRIVERS
DESCRIPTION
These Easy-to-Drive FASTSWITCH NPN power
transistors are specially designed for high
reliability industrial and professional power driving
applications such us motor drives and off-line
switching power supplies. ETD transistors will
operate using easy drive circuits at up to 100KHz;
this helps to simplify designs and improve
reliability. The superior switching performance
and low crossover losses reduce dissipation and
consequently lowers the equipment operating
temperature.

INTERNAL SCHEMATIC DIAGRAM
January 1999
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
BUF405A BUF405AFP
VCEV Collector-Emitter Voltage (VBE = -1.5 V) 1000 V
VCEO Collector-Emitter Voltage (IB = 0) 450 V
VEBO Emitter-Base Voltage (IC =0) 7 V
IC Collector Current 7.5 A
ICM Collector Peak Current (tp <5ms) 15 A
IB Base Current 3 A
IBM Base Peak Current (tp <5ms) 4.5 A
Ptot Total Dissipation at Tc =25
o
C809W
stg
Storage Temperature -65 to 150
o
C
T
j
Max Operation Junction Temperature 150
o
C
1
2
3
TO-220 TO-220FP
1
2
3
1/6