This part is a kind of semiconductor called 25F.

Function of this product has STANDARD RECOVERY DIODES.

Manufacturers : InternationalRectifier

Image and pinout :

Some of the text within the PDF file :

Bulletin I2018 rev. B 09/98 25F(R) SERIES STANDARD RECOVERY DIODES Stud Version Features High surge current capability Avalanche types available Stud cathode and stud anode version Wide current range Types up to 1200V VRRM 25 A TypicalApplications Battery charges Converters Power supplies Machine tool controls Major Ratings and Characteristics Parameters IF(AV) @ TC IF(RMS) IFSM @ 50Hz @ 60Hz I2t @ 50Hz @ 60Hz VRRM TJ range range 25F(R) 25 120 40 356 373 636 580 100 to 1200 - 65 to 175 Units A °C A A A A2s A2 s V °C case style DO-203AA (DO-4) www.irf.com 1 25F(R) Series Bulletin I2018 rev. B 09/98 ELECTRICAL SPECIFICATIONS Voltage Ratings Type number Voltage Code VRRM, maximum repetitive peak reverse voltage V 100 200 400 600 800 1000 1200 VRSM, maximum nonrepetitive peak re [ ... ]

25F PDF Datasheet Download