Obsolete — sourcing for last-time-buy and replacement
At 40 A the on-state dissipation is roughly 6.7 W, which the 330 W package rating can handle with proper heatsinking.
120 A continuous drain — thermal derating reality
The 120 A continuous drain current is specified at a case temperature of 25°C. In a real enclosure at 85°C ambient, derating is significant — the junction-to-case thermal path and the 330 W dissipation ceiling limit usable current.
TO-220-3 package — mounting and thermal interface
The through-hole TO-220-3 package allows direct mounting to a heatsink with a single screw. The exposed metal tab is the drain, so an insulating pad or thermal compound is needed if the heatsink is at chassis ground.
