This part is a kind of semiconductor called CC5551.

Function of this product has NPN COMPLEMENTARY SILICON HIGH VOLTAGE TRANSISTOR.

Manufacturers : CDIL

Image and pinout :

Some of the text within the PDF file :

Continental Device India Limited An IS/ISO 9002 and IECQ Certified Manufacturer IS/ISO 9002 Lic# QSC/L- 000019.2 NPN COMPLEMENTARY SILICON HIGH VOLTAGE TRANSISTOR CC5551 (9AW) TO-92 BCE MARKING : NCC 5551 High Voltage NPN Transistor for General Purpose and Telephony Applications ABSOLUTE MAXIMUM RATINGS DESCRIPTION SYMBOL VALUE VCEO Collector -Emitter Voltage 160 VCBO Collector -Base Voltage 180 VEBO Emitter -Base Voltage 6.0 IC Collector Current Continuous 600 PD Power Dissipation @Ta=25°C 625 Derate Above 25°C 5.0 PD Power Dissipation @Tc=25°C 1.5 Derate Above 25°C 12 Tj Junction Temperature 150 Tstg Storage Temperature -55 to +150 THERMAL RESISTANCE Rth(j-c) Junction to Case 125 Rth(j-a) (1) Junction to Ambient 357 (1) Rth(j-a) is measured with the device soldered into a typical [ ... ]

CC5551 PDF Datasheet Download