This part is a kind of semiconductor called FFA15U120DN.

Function of this product has ULTRA FAST RECOVERY POWER RECTIFIER.

Manufacturers : Fairchild Semiconductor

Image and pinout :

Some of the text within the PDF file :

FFA15U120DN FFA15U120DN Features • High voltage and high reliability • High speed switching • Low forward voltage Applications • • • • General purpose Switching mode power supply Free-wheeling diode for motor application Power switching circuits 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 1200 @ TC = 100°C 15 90 - 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) TC=25 °C unl [ ... ]

FFA15U120DN PDF Datasheet Download