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BF257 BF258-BF259 October 1988 HIGH VOLTAGE VIDEO AMPLIFIERS DESCRIPTION The BF257, BF258 and BF259 are silicon planar epitaxial NPN transistors in Jedec TO-39 metal case. They are particularly designed for video output stages in CTV and MTV sets, class A audio output stages and drivers for horizontal deflection circuits. ABSOLUTE MAXIMUM RATINGS Value SymbolParameter BF257 BF258 BF259 Unit V CBO Collector-base Voltage (I E = 0)160250300V V CEO Collector-emitter Voltage (I B = 0)160250300V V EBO Emitter-base Voltage (I C =0)5V I C Collector Current100mA I CM Collector Peak Current200mA P tot Total Power Dissipation at T amb ≤50°C5W T stg Storage Temperature– 55 to 200°C T j Junction Temperature200°C INTERNAL SCHEMATIC DIAGRAM TO-39 1/5