This part is a kind of semiconductor called IC-F521.

Function of this product has VHF TRANSCEIVER SERVICE MANUAL.

Manufacturers : Icom

Image and pinout :

Some of the text within the PDF file :

SERVICE MANUAL VHF TRANSCEIVER iF510 iF520 iF521 INTRODUCTION This service manual describes the latest service information for the IC-F510, IC-F520 and IC-F521 VHF TRANSCEIVERS at the time of publication. MODEL IC-F510 IC-F520 IC-F521 VERSION Europe General U.S.A. U.S.A. General SYMBOL EUR GEN USA USA GEN To upgrade quality, any electrical or mechanical parts and internal circuits are subject to change without notice or obligation. DANGER NEVER connect the transceiver to an AC outlet or to a DC power supply that uses more than 16 V. This will ruin the transceiver. DO NOT expose the transceiver to rain, snow or any liquids. DO NOT reverse the polarities of the power supply when connecting the transceiver. DO NOT apply an RF signal of more than 20 dBm (100 mW) to the antenna connector [ ... ]

IC-F521 PDF Datasheet Download