This part is a kind of semiconductor called KSD302.

Function of this product has KSD302.

Manufacturers : ETC

Image and pinout :

Some of the text within the PDF file :

a FEATURES Low Voltage Operation (2.7 V to 12 V) Calibrated Directly in ؇C 10 mV/ ؇C Scale Factor ؎ 2؇C Accuracy Over Temperature (typ) ؎ 0.5؇C Linearity (typ) Stable with Large Capacitive Loads Specified –40؇C to +125؇C, Operation to +150؇C Less than 60 mA Quiescent Current Low Self-Heating APPLICATIONS Environmental Control Systems Thermal Protection Industrial Process Control Fire Alarms Power System Monitors CPU Thermal Management Low Voltage SOT-23 Temperature Sensors ADT45/ADT50 FUNCTIONAL BLOCK DIAGRAM +Vs (2.7V to 12V) ADT45 ADT50 VOUT PACKAGE TYPES AVAILABLE SOT-23 +VS 1 TOP VIEW 3 GND (Not to Scale) VOUT 2 GENERAL DESCRIPTION The ADT45 and ADT50 are low voltage, precision centigrade temperature sensors. They provide a voltage output that is linearly proportional [ ... ]

ADT50 PDF Datasheet Download