This part is a kind of semiconductor called TIP127.
Function of this product has Silicon PNP Darlington Power Transistors.
Manufacturers : SavantIC
Image and pinout :
Some of the text within the PDF file :
SavantIC Semiconductor Silicon PNP Darlington Power Transistors Product Specification TIP125/126/127 DESCRIPTION ·With TO-220C package ·DARLNGTON ·High DC current gain ·Low collector saturation voltage ·Complement to type TIP120/121/122 APPLICATIONS ·Designed for general–purpose amplifier and low–speed switching applications PINNING PIN DESCRIPTION 1 Base 2 Collector;connected to mounting base 3 Emitter ABSOLUTE MAXIMUM RATINGS(Tc=25 ) SYMBOL PARAMETER CONDITIONS TIP125 VCBO Collector-base voltage TIP126 TIP127 Open emitter TIP125 VCEO Collector-emitter voltage TIP126 TIP127 Open base VEBO IC ICM IB PC Tj Tstg Emitter-base voltage Collector current-DC Collector current-Pulse Base current-DC Collector power dissipation Junction temperature Storage temperatu [ ... ]