This part is a kind of semiconductor called FFA10U40DN.
Function of this product has ULTRA FAST RECOVERY POWER RECTIFIER.
Manufacturers : Fairchild Semiconductor
Image and pinout :

Some of the text within the PDF file :
FFA10U40DN FFA10U40DN Features • Ultrafast with soft recovery • Low forward voltage Applications • • • • Power switching circuits Output rectifiers Freewheeling diodes Switching mode power supply TO-3P 1 2 3 1. Anode 2.Cathode 3. Anode ULTRA FAST RECOVERY POWER RECTIFIER Absolute Maximum Ratings Symbol VRRM IF(AV) IFSM TJ, TSTG (per diode) TC=25°C unless otherwise noted Value 400 @ TC = 100°C 10 100 - 65 to +150 Units V A A °C Parameter Peak Repetitive Reverse Voltage Average Rectified Forward Current Non-repetitive Peak Surge Current 60Hz Single Half-Sine Wave Operating Junction and Storage Temperature Thermal Characteristics Symbol RθJC Parameter Maximum Thermal Resistance, Junction to Case (per diode) T C =25 °C unless otherwise noted Min. TC = 25 °C TC = 100 °C [ ... ]
FFA10U40DN PDF Datasheet Download
