View bu508a datasheet:

BU208A/508A/508AFI HIGH VOLTAGE FAST-SWITCHING NPN POWER TRANSISTOR SGS-THOMSON PREFERRED SALESTYPES HIGH VOLTAGE CAPABILITY U.L. RECOGNISED ISOWATT218 PACKAGE (U.L. FILE # E81734 (N) TO-3 JEDEC TO-3 METAL CASE. 1 APPLICATIONS: 2 HORIZONTAL DEFLECTION FOR COLOUR TV DESCRIPTION The BU208A, BU508A and BU508AFI are manufactured using Multiepitaxial Mesa 3 3 technology for cost-effective high performance 2 2 1 1 and uses a Hollow Emitter structure to enhance TO-218 ISOWATT218 switching speeds. INTERNAL SCHEMATIC DIAGRAM ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit V Collector-Emitter Voltage (V = 0) 1500 V CES BE VCEO Collector-Emitter Voltage (IB = 0) 700 V V Emitter-Base Voltage (I = 0) 10 V EBO C IC Collector Current 8 A ICM Collector Peak Cur