This part is a kind of semiconductor called FR307.

Function of this product has 3.0A FAST RECOVERY RECTIFIER.

Manufacturers : Diodesorporated

Image and pinout :

Some of the text within the PDF file :

FR301 - FR307 3.0A FAST RECOVERY RECTIFIER Features · · · · · Low Reverse Recovery Time (Trr) Low Reverse Current Low Forward Voltage Drop High Current Capability Plastic Material - UL Recognition 94V-0 A B A D C Mechanical Data · · · · · Case: DO-201AD, Molded Plastic Terminals: Axial Leads, Solderable per MIL-STD-202 Method 208 Polarity: Color Band Denotes Cathode Approx. Weight: 1.1 grams Mounting Position: Any Dim A B C D DO-201AD Min 25.4 7.2 1.2 4.8 Max 9.5 1.3 5.3 All Dimensions in mm Maximum Ratings and Electrical Characteristics Ratings at 25° C ambient temperature unless otherwise specified. Single phase, half wave, 60Hz, resistive or inductive load. Characteristic Maximum Recurrent Peak Reverse Voltage Maximum RMS Voltage Maximum DC Blocking voltage Maximu [ ... ]

FR307 PDF Datasheet Download