D2PAK footprint and thermal story
The AUIRF1324S comes in a D2PAK (TO-263) surface-mount package.
Conduction loss at 195 A switching current
Rated 1.65 mOhm maximum on-resistance at Vgs = 10 V and Id = 195 A — that is the conduction loss figure a designer uses to size the heatsinking and PCB copper. At 195 A the dissipation in the channel alone is about 63 W, which the D2PAK must shed into the board's thermal vias and backside copper pour. Gate charge is 240 nC at Vgs = 10 V. For a switching regulator running at 100 kHz, the average gate-drive current is 24 mA — well within a standard gate-driver IC's output capability, but the driver's peak current must be high enough to charge that 240 nC within the desired switching transition time.
Active production — no obsolescence watch needed
The junction temperature range spans -55°C to 175°C. That covers automotive under-hood environments where ambient under the bonnet can exceed 125°C, as well as industrial motor-drive enclosures with high internal thermal rise.