This part is a kind of semiconductor called BA4558RF.

Function of this product has Low Noise Operational Amplifiers.

Manufacturers : Rohm

Image and pinout :

Some of the text within the PDF file :

Operational Amplifiers / Comparators Low Noise Operational Amplifiers BA4558F, BA4558R F/FV/FVM, BA4560F, BA4560R F/FV/FVM, BA4564RFV BA4580R F/FVM, BA4584FV, BA4584R F/FV, BA8522R F/FV/FVM BA15218F, BA14741F, BA15532F, BA4510F/FV, BA2115F/FVM No.11049EBT16 ●Description General-purpose BA4558 / BA456 0 / BA1 5218 / BA14741 / BA15532 / BA4510 famil y a nd hig h-reliability BA4 558R / BA4560R / B A4564R / BA4 580R / BA45 84 / BA458 4R / BA852 2R / B A2115 famil y integrate t wo o r four in dependent Op-Amps on a single chip Es pecially, this series is suit able for an y audio applications due to lo w noise and l ow distortion characteristics and are usable for other many applications by wide operating supply voltage range. BA4558R / BA 4560R / BA4 564R / BA4 580R / BA458 4R / BA852 2R / [ ... ]

BA4558RF PDF Datasheet Download