This part is a kind of semiconductor called 25F80.

Function of this product has Standard Recovery Diodes.

Manufacturers : Vishay Siliconix

Image and pinout :

Some of the text within the PDF file :

25F(R) Series Vishay High Power Products Standard Recovery Diodes (Stud Version), 25 A FEATURES • High surge current capability • Stud cathode and stud anode version • Wide current range • Types up to 1200 V VRRM • RoHS compliant RoHS COMPLIANT TYPICAL APPLICATIONS DO-203AA (DO-4) • Battery charges • Converters PRODUCT SUMMARY IF(AV) 25 A • Power supplies • Machine tool controls MAJOR RATINGS AND CHARACTERISTICS PARAMETER IF(AV) IF(RMS) IFSM I2 t VRRM TJ 50 Hz 60 Hz 50 Hz 60 Hz Range TEST CONDITIONS VALUES 25 TC 120 40 356 373 636 580 100 to 1200 - 65 to 175 UNITS A °C A A A2 s V °C ELECTRICAL SPECIFICATIONS VOLTAGE RATINGS TYPE NUMBER VOLTAGE CODE VRRM, MAXIMUM REPETITIVE PEAK REVERSE VOLTAGE V 100 200 400 600 800 1000 1200 VRSM, MAXIMUM NO [ ... ]

25F80 PDF Datasheet Download