This part is a kind of semiconductor called ATA5276.

Function of this product has TRANSMITTER IC.

Manufacturers : ATMEL Corporation

Image and pinout :

Some of the text within the PDF file :

Features • • • • • • • • • • • • • • • • Antenna Driver Stage with Adjustable Antenna Peak Current for up to 1.5A Frequency Tuning Range from 100 kHz to 150 kHz Automatic Antenna Peak Current Regulation Self-tuning Oscillator for Antenna Resonant Frequency Adaptation Capable of Driving a High-Q Antenna Integrated 5V Regulator for External Load up to 10 mA Bi-directional Single Wire Interface for Microcontroller or ECU LF Baud Rates up to 4 kbaud and Amplitude Shift Keying (ASK) Modulation Low Power Standby Mode < 50 µA Antenna Driver Diagnosis: Peak Current, Antenna Frequency and Battery Voltage Monitoring Power Supply Range 8V to 24V Direct Battery Input Load Dump Protection Operation at Temperature –40°C to +105°C EMI and ESD According to Automotive R [ ... ]

ATA5276 PDF Datasheet Download