
BF257
BF258-BF259
October 1988
HIGHVOLTAGE VIDEO AMPLIFIERS
DESCRIPTION
The BF257, BF258 and BF259 are silicon planar
epitaxial NPN transistors in Jedec TO-39 metal
case.They areparticularly designedforvideooutput
stages in CTV and MTV sets, class A audio output
stagesand drivers for horizontal deflection circuits.
ABSOLUTE MAXIMUM RATINGS
Value
Symbol Parameter BF257 BF258 BF259 Unit
VCBO Collector-base Voltage (IE= 0) 160 250 300 V
VCEO Collector-emitter Voltage (IB= 0) 160 250 300 V
VEBO Emitter-base Voltage (IC=0) 5 V
ICCollector Current 100 mA
ICM Collector Peak Current 200 mA
Ptot Total Power Dissipation at Tamb ≤50 °C5W
T
stg Storage Temperature – 55 to 200 °C
TjJunction Temperature 200 °C
INTERNAL SCHEMATIC DIAGRAM
TO-39
1/5