This part is a kind of semiconductor called 78R08.

Function of this product has KA78R08.

Manufacturers : Fairchild Semiconductor

Image and pinout :

Some of the text within the PDF file :

www.fairchildsemi.com KA78R08 Low Dropout Voltage Regulator Features • 1A / 8V Output low dropout voltage regulator • TO220 Full-Mold package (4Pin) • Overcurrent protection, Thermal shutdown • Overvoltage protection, Short-Circuit protection • With output disable function Description The KA78R08 is a low-dropout voltage regulator suitable for various electronic equipments. It provides constant voltage power source with TO-220 4 lead full mold package. Dropout voltage of KA78R08 is below 0.5V in full rated current(1A). This regulator has various function such as peak current protection, thermal shut down, overvoltage protection and output disable function. TO-220F-4L 1 1.Vin 2. V O 3. GND 4. Vdis Internal Block Diagram Q1 Vin 1 2 Vo THERMAL SHUTDO [ ... ]

78R08 PDF Datasheet Download