This part is a kind of semiconductor called BU508AFI.

Function of this product has HIGH VOLTAGE FAST-SWITCHING NPN POWER TRANSISTORS.

Manufacturers : ST Microelectronics

Image and pinout :

Some of the text within the PDF file :

BU208A ® BU508A/BU508AFI HIGH VOLTAGE FAST-SWITCHING NPN POWER TRANSISTORS s STMicroelectronics PREFERRED SALESTYPES s HIGH VOLTAGE CAPABILITY (> 1500 V) s FULLY INSULATED PACKAGE (U.L. COMPLIANT) FOR EASY MOUNTING APPLICATIONS: s HORIZONTAL DEFLECTION FOR COLOUR TV DESCRIPTION The BU208A, BU508A and BU508AFI are manufactured using Multiepitaxial Mesa technology for cost-effective high performance and use a Hollow Emitter structure to enhance switching speeds. 1 2 TO-3 TO-218 33 22 1 ISOWATT218 1 INTERNAL SCHEMATIC DIAGRAM For TO-3 : C = Tab E = Pin2. ABSOLUTE MAXIMUM RATINGS Symbol VCES VCEO V EBO IC ICM Parameter Collector-Emit ter Volt age (VBE = 0) Collector-Emitter Voltage (IB = 0) Emitt er-Base Voltage (IC = 0) Collector Current Collector Peak Current (tp < 5 ms) Ptot Vi [ ... ]

BU508AFI PDF Datasheet Download