This part is a kind of semiconductor called MRD300.Function of this product has (MRD300 / MRD310) PHOTO DETECTORS TRANSISTOR OUTPUT. Manufacturers : Motorola Image and pinout : Some of the text within the PDF file : [ ... ] MRD300 PDF Datasheet Download Metablog 2017/10/13 02:24 2017/10/13 02:24