This part is a kind of semiconductor called ATA5744.

Function of this product has UHF ASK Receiver.

Manufacturers : ATMEL Corporation

Image and pinout :

Some of the text within the PDF file :

Features • Minimal External Circuitry Requirements, no RF Components on the PC Board Except • • • • • • • • • • • • Matching to the Receiver Antenna High Sensitivity, Especially at Low Data Rates SSO20 and SO20 package Fully Integrated VCO Supply Voltage 4.5V to 5.5V, Operating Temperature Range –40°C to +105°C Single-ended RF Input for Easy Adaptation to l/4 Antenna or Printed Antenna on PCB Low-cost Solution Due to High Integration Level Various Types of Protocols Supported (i.e., PWM, Manchester and Bi-phase) Distinguishes the Signal Strength of Several Transmitters via RSSI (Received Signal Strength Indicator) ESD Protection According to MIL-STD. 883 (4KV HBM) High Image Frequency Suppression Due to 1 MHz IF in Conjunction with a SAW Front-end Filter, up t [ ... ]

ATA5744 PDF Datasheet Download