This is the conduction-loss figure to use in a hard-switched topology like a flyback or PFC boost stage.
The base product number is SPA11N, which covers the family of voltage and package variants — useful when searching for datasheets or PCN notifications.
TO-220 Full Pack — mounting and thermal management
Maximum power dissipation is 33 W at case temperature, which sets the thermal budget for the heatsink design.
