This is an N-Channel enhancement mode silicon gate power field effect transistor designed for applications such as switching regulators, switching converters, motor drivers, relay drivers, and drivers for high power bipolar switching transistors requiring high speed and low gate drive power.
They can be operated directly from integrated circuits.
Formerly developmental type TA9399.

Features
• 15A, 400V
• rDS(ON)= 0.300Ω
• Single Pulse Avalanche Energy Rated
• SOA is Power Dissipation Limited
• Nanosecond Switching Speeds
• Linear Transfer Characteristics
• High Input Impedance
• Related Literature
- TB334 “Guidelines for Soldering Surface Mount
   Components to PC Boards”