This part is a kind of semiconductor called 85HFL40S02.

Function of this product has (85HFL Series) Fast Recovery Diodes.

Manufacturers : Vishay Siliconix

Image and pinout :

Some of the text within the PDF file :

40HFL, 70HFL, 85HFL Series Vishay High Power Products Fast Recovery Diodes (Stud Version), 40 A/70 A/85 A FEATURES • Short reverse recovery time • Low stored charge • Wide current range • Excellent surge capabilities • Stud cathode and stud anode versions • Types up to 100 VRRM DO-203AB (DO-5) • Compliant to RoHS directive 2002/95/EC TYPICAL APPLICATIONS • DC power supplies PRODUCT SUMMARY IF(AV) 40 A/70 A/85 A • Inverters • Converters • Choppers • Ultrasonic systems • Freewheeling diodes www.DataSheet.co.kr MAJOR RATINGS AND CHARACTERISTICS SYMBOL IF(AV) CHARACTERISTICS 40HFL 40 Maximum TC 50 Hz IFSM 60 Hz 50 Hz 60 Hz I2 √ t VRRM trr TJ Range Range 85 400 420 800 730 11 300 70HFL 70 85 700 730 2450 2240 34 650 100 to 1000 See Recovery Characteristics tab [ ... ]

85HFL40S02 PDF Datasheet Download