This part is a kind of semiconductor called KDS184.

Function of this product has SILICON EPITAXIAL PLANAR DIODE.

Manufacturers : KEC

Image and pinout :

Some of the text within the PDF file :

SEMICONDUCTOR TECHNICAL DATA ULTRA HIGH SPEED SWITCHING APPLICATION. FEATURES Small Package : SOT-23. Low Forward Voltag : VF=0.9V(Typ.). Fast Reverse Recovery Time : trr=1.6ns(Typ.). Small Total Capacitance : CT=0.9pF(Typ.). MAXIMUM RATING (Ta=25 ) CHARACTERISTIC SYMBOL Maximum (Peak) Reverse Voltage VRM Reverse Voltage VR Maximum (Peak) Forward Current IFM Average Forward Current IO Surge Current (10ms) IFSM Power Dissipation PD Junction Temperature Tj Storage Temperature Range Tstg Note : *Unit Rating. Total Rating=Unit Rating x 1.5 RATING 85 80 300 * 100 * 2* 150 150 -55 150 UNIT V V mA mA A mW KDS184 SILICON EPITAXIAL PLANAR DIODE E L BL DIM MILLIMETERS A 2.93+_ 0.20 B 1.30+0.20/-0.15 A G H D 23 C 1.30 MAX D 0.40+0.15/-0.05 E 2.40+0.30/-0.20 1 G 1.90 H 0 [ ... ]

KDS184 PDF Datasheet Download