This part is a kind of semiconductor called 2SC1030.

Function of this product has SILICON NPN TRASISTORS.

Manufacturers : ETC

Image and pinout :

Some of the text within the PDF file :

Power Transistors www.jmnic.com 2SC1030 Silicon NPN Transistors 1B 2E 3C Features With TO-3 package Low frequency power amplifications Absolute Maximum Ratings Tc=25 SYMBOL VCBO VCEO VEBO IC PD Tj Tstg PARAMETER Collector to base voltage Collector to emitter voltage Emitter to base voltage Collector current-Continuous Total Power Dissipation@TC=25 Junction temperature Storage temperature RATING 150 80 6 6 50 200 -55~200 UNIT V V V A W TO-3 Electrical Characteristics Tc=25 SYMBOL VCEO VCER ICEO IEBO ICBO VEBO VCE(sat-1) VCE(sat-2) VCE(sat-3) hFE-1 hFE-2 hFE-3 VBE(on) fT hfe PARAMETER Collector-Emitter Sustaining Voltage Collector-Emitter Sustaining Voltage Collector Cutoff Current Emitter Cutoff Current Collector Cutoff Current Base-emitter breakdown voltage Collector-emitter satur [ ... ]

2SC1030 PDF Datasheet Download