Operating junction temperature spans -55 to 175 °C, which is the full automotive-grade range. The PG-HSOG-8-1 package is a surface-mount PowerSO-8 with gull-wing leads and a large exposed pad — the pad footprint and via array under the part are what carry the heat. Treat the 53 A ambient rating as the no-heatsink ceiling; above that, budget for forced air or a thermal interface to the chassis.
The OptiMOS™ 5 series is Infineon's mainstream high-current trench MOSFET platform, so supply depth is generally good across the distribution channel.