This part is a kind of semiconductor called MAX6675ISA.

Function of this product has Cold-Junction-Compensated K-Thermocoupleto-Digital Converter (0C to +1024C).

Manufacturers : Maxim

Image and pinout :

Some of the text within the PDF file :

19-2235; Rev 1; 3/02 Cold-Junction-Compensated K-Thermocoupleto-Digital Converter (0°C to +1024°C) MAX6675 General Description The MAX6675 performs cold-junction compensation and digitizes the signal from a type-K thermocouple. The data is output in a 12-bit resolution, SPI™-compatible, read-only format. This converter resolves temperatures to 0.25°C, allows readings as high as +1024°C, and exhibits thermocouple accuracy of 8LSBs for temperatures ranging from 0°C to +700°C. The MAX6675 is available in a small, 8-pin SO package. o Direct Digital Conversion of Type -K Thermocouple Output o Cold-Junction Compensation o Simple SPI-Compatible Serial Interface o 12-Bit, 0.25°C Resolution o Open Thermocouple Detection Features Ordering Information PART MAX6675ISA TEMP RANGE -20°C to [ ... ]

MAX6675ISA PDF Datasheet Download