This part is a kind of semiconductor called RF1601T2D.

Function of this product has Fast Recovery Diodes.

Manufacturers : Rohm

Image and pinout :

Some of the text within the PDF file :

Fast recovery diodes RF1601T2D Applications General rectification Dimensions (Unit : mm) 4.5±0.3 　　　 0.1 10.0±0.3 　　　 0.1 2.8±0.2 　　　 0.1 Structure 1.2 1.3 0.8 5.0±0.2 Features 1) Cathode common type. (TO-220) 2) Ultra Low V F 3) Very fast recovery 4) Low switching loss (1) (2) (3) 8.0±0.2 12.0±0.2 15.0±0.4 　 0.2 13.5MIN 8.0 ① Construction Silicon epitaxial planar (1) (2) (3) 0.7±0.1 0.05 2.6±0.5 ROHM : ＴO220FN ① Manufacture Date Absoslute maximum ratings (Ta=25C) Parameter Limits Symbol Reverse voltage (repetitive peak) 200 VRM Reverse voltage (DC) 200 VR Average rectified forward current (*1) 16 Io Forward current surge peak (60Hz/1cyc) 80 IFSM Junction temperature 150 Tj Storage temoerature -55 to + [ ... ]

RF1601T2D PDF Datasheet Download