This part is a kind of semiconductor called BDY90.

Function of this product has HIGH CURRENT NPN SILICON TRANSISTOR.

Manufacturers : STMicroelectronics

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Some of the text within the PDF file :

BDY90 HIGH CURRENT NPN SILICON TRANSISTOR s SGS-THOMSON PREFERRED SALESTYPE APPLICATIONS LINEAR AND EQUIPMENT SWITCHING INDUSTRIAL DESCRIPTION The BDY90 is a silicon epitaxial planar NPN power transistors in Jedec TO-3 metal case. They are intented for use in switching and linear applications in military and industrial equipment. 1 2 TO-3 INTERNAL SCHEMATIC DIAGRAM ABSOLUTE MAXIMUM RATINGS Value V CBO V CEV V CEO V EBO IC I CM IB P tot T stg Tj Collector-base Voltage (I E = 0) Collector-emitter Voltage (V BE = -1.5V) Collector-emitter Voltage (I B = 0) Emitter-base Voltage (I C = 0) Collector Current Collector Peak Current (repetitive) Base Current Total Dissipation at T c ≤ 25 o C Storage Temperature Max. Operating Junction Temperature 120 120 100 6 10 15 2 60 -65 to 175 175 V V [ ... ]

BDY90 PDF Datasheet Download