This part is a kind of semiconductor called PT4110.

Function of this product has Side View and Thin Flat Type Phototransistors.

Manufacturers : Sharp Electrionic Components

Image and pinout :

Some of the text within the PDF file :

PT4110/PT4110F PT4110/PT4110F s Features 1. Compact and thin flat package 2. Wide beam angle (Half intensity angle : ± 70˚ ) 3. Visible light cut-off type available ( PT4110F ) Side View and Thin Flat Type Phototransistors s Outline Dimensions 1.8 MAX. 0.3 Gate burr (Unit : mm) 2 - C0.5 3.0 Detector center 0.7 0.7 4˚ 4˚ MAX. 0.1 4˚ 4˚ 0.15 1.5 17.5 + - 1.0 g Epoxy resin Rugged resin MAX. 0.9 s Applications 1. Optoelectronic switches 2. Encoders (1.7) 1 20.3 0.4 + - 0.1 Rugged resin 1.4 1.5 4.0 MAX. 0.2 20.3 0.45 + - 0.1 2 1 2 MIN. 0.5 (2.54) 6˚ 6˚ 1 Emitter 2 Collector g Resin type Model PT4110 Pale blue transparent epoxy resin PT4110F Black visible light cut-off epoxy resin * Tolerance : ± 0.2 mm * ( ) : Reference dimensions 6˚ 2.8 6˚ s Absolute Maximum [ ... ]

PT4110 PDF Datasheet Download