This part is a kind of semiconductor called LM317K.

Function of this product has 3-Terminal POSITIVE ADJUSTABLE VOLTAGE REGULATOR.

Manufacturers : Comset Semiconductor

Image and pinout :

Some of the text within the PDF file :

LM317K 3-Terminal Positive Adjustable Regulators GENERAL DESCRIPTION The LM317T are monolithic integrated circuits in TO220 packages. They are intended for use as positive adjustable voltage regulators, and designed to supply more than 1.5A of load current whit an output voltage adjustable over a 1.2 to 37V range. Compliance to RoHS. ABSOLUTE MAXIMUM RATINGS Symbol Vi-Vo Io PD TOP TSTG Ratings Input-Output Voltage Differential Output Current Power Dissipation Operating Junction Temperature Storage Temperature www.DataSheet.net/ Value 40 1.5 Internally Limited 0° to 125 -65° to 150 Unit V A W °C °C THERMAL DATA Symbol RthJC RthJA Ratings From Junction to Case Thermal Resistance From Junction to Free-Air Thermal Resistance Value 1.67 62.5 Unit °C/W CHARACTERISTICS Vi-Vo = 5 V, [ ... ]

LM317K PDF Datasheet Download