This part is a kind of semiconductor called 2072D.

Function of this product has NJM2072D.

Manufacturers : New Japan Radio

Image and pinout :

Some of the text within the PDF file :

NJM2072 MEMO [CAUTION] The specifications on this databook are only given for information , without any guarantee as regards either mistakes or omissions. The application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights. [ ... ]

2072D PDF Datasheet Download