This part is a kind of semiconductor called C2542.

Function of this product has 2SC2542.

Manufacturers : SavantIC

Image and pinout :

Some of the text within the PDF file :

SavantIC Semiconductor Product Specification Silicon NPN Power Transistors 2SC2542 DESCRIPTION With TO-220C package ·High voltage ,high speed switching ·High reliability APPLICATIONS ·Switching regulators ·Ultrasonic generators ·High frequency inverters ·General purpose power amplifiers PINNING PIN 1 2 3 Base Collector;connected to mounting base Emitter DESCRIPTION ABSOLUTE MAXIMUM RATINGS(TC=25 ) SYMBOL VCBO VCEO VEBO IC IB PC Tj Tstg PARAMETER Collector-base voltage Collector-emitter voltage Emitter-base voltage Collector current Base current Collector power dissipation Junction temperature Storage temperature TC=25 Open emitter Open base Open collector CONDITIONS VALUE 450 400 7 5 1.5 40 150 -45~150 UNIT V V V A A W THERMAL CHARACTERISTICS SYMBOL Rth j-C [ ... ]

C2542 PDF Datasheet Download