This part is a kind of semiconductor called GM-5400T.

Function of this product has BRIDGEABLE TWO-CHANNEL POWER AMPLIFIER SERVICE MANUAL.

Manufacturers : Pioneer

Image and pinout :

Some of the text within the PDF file :

ORDER NO. CRT4251 GM-5400T/XJ/UC BRIDGEABLE TWO-CHANNEL POWER AMPLIFIER GM-5400T GM-5400T/XJ/EW5 GM-5400T/XJ/ES /XJ/UC For details, refer to "Important Check Points for Good Servicing". PIONEER CORPORATION 4-1, Meguro 1-chome, Meguro-ku, Tokyo 153-8654, Japan PIONEER ELECTRONICS (USA) INC. P.O. Box 1760, Long Beach, CA 90801-1760, U.S.A. PIONEER EUROPE NV Haven 1087, Keetberglaan 1, 9120 Melsele, Belgium PIONEER ELECTRONICS ASIACENTRE PTE. LTD. 253 Alexandra Road, #04-01, Singapore 159936 PIONEER CORPORATION 2008 K-ZZZ. NOV. 2008 Printed in Japan 1 2 3 4 SAFETY INFORMATION CAUTION A This service manual is intended for qualified service technicians; it is not meant for the casual do-it-yourselfer. Qualified technicians have the necessary test equipment and tools, and have been [ ... ]

GM-5400T PDF Datasheet Download