This part is a kind of semiconductor called HTU21D.

Function of this product has Digital Relative Humidity sensor.

Manufacturers : TE

Image and pinout :

Some of the text within the PDF file :

HTU21D(F) RH/T SENSOR IC Digital Relative Humidity sensor with Temperature output SPECIFICATIONS  DFN type package  Relative Humidity and Temperature Digital Output, I²C interface  Fully calibrated  Lead free sensor, reflow solderable  Low power consumption  Fast response time FEATURES  Full interchangeability with no calibration required in standard conditions  Instantaneous desaturation after long periods in saturation phase  Compatible with automatized assembly processes, including Pb free and reflow processes  Individual marking for compliance to stringent traceability requirements APPLICATIONS  Home Appliance  Medical  Printers  Humidifier  The HTU21D(F) is a new digital humidity sensor with temperature output by MEAS. Setting new standa [ ... ]

HTU21D PDF Datasheet Download