This part is a kind of semiconductor called 1SS355.

Function of this product has FAST SWITCHING DIODE.

Manufacturers : JCET

Image and pinout :

Some of the text within the PDF file :

JIANGSU CHANGJIANG ELECTRONICS TECHNOLOGY CO., LTD SOD-323 Plastic-Encapsulate Diodes 1SS355 FAST SWITCHING DIODE FEATURES  Small surface mounting type  High speed  High reliability with high surge current handling capability MARKING: A SOD-323 A The marking bar indicates the cathode A Solid dot = Green molding compound device,if none,the normal device. Maximum Ratings and Electrical Characteristics, Single Diode @Ta=25℃ Parameter Non-repetitive peak reverse voltage DC blocking voltage Peak forword current Average rectified output current Non-Repetitive Peak Forward Surge Current @t=8.3ms Power Dissipation Thermal Resistance from Junction to Ambient Junction temperature Storage temperature Symbol VRM VR IFM IO IFSM PD RθJA TJ TSTG Limit 90 80 225 100 2.0 200 625 150 -55~ [ ... ]

1SS355 PDF Datasheet Download