This part is a kind of semiconductor called KRA011.

Function of this product has HIGH SENSITIVITY PHOTO INTERRUPTER.

Manufacturers : Kingbright Corporation

Image and pinout :

Some of the text within the PDF file :

Part NO. :KRA011 SUBMINIATURE, HIGH SENSITIVITY PHOTOINTERRUPTER *Features 1.Ultra-compact. 2.PWBmounting type package. 3.High sensing accuracy (Slit width:0.4mm). 4.Gap between light emitter and detector:2mm. 5.RoHS Compliant. *Applications Cassette tape recorders,VCRs. Floppy disk drives. tVarious microcomputerized control equipment. righUNIT : MM[INCH] TOLERANCE : ±0.25[±0.01] UNLESS OTHERWISE NOTED. bNote: gThe specifications, characteristics and technical data described in the datasheet are subject to change without prior notice. Kin*Absolute Maximum Ratings (TA=25°C) Parameter Symbol Rating Unit Forward current IF 50 mA Input Reverse voltage Power dissipation Peak Forward Current (Pulse Width <100uS,Duty Cycle=1%) Collector-emitter voltage VR Pd IFP VCEO 6 75 1 35 V m [ ... ]

KRA011 PDF Datasheet Download