The TO-220-3 through-hole package carries a 300 W power dissipation rating at the case, so a heatsink is expected for any sustained load above a few amps.
The 55 V Vdss gives about 20 % headroom on a 48 V telecom bus or a 42 V automotive load-dump clamp — enough for most non-automotive rails. The 80 A continuous rating at 25 °C case temperature is a package-limited number; real-world current is lower once the junction temperature and switching losses are factored in. The 8 mΩ Rds(on) is specified at 10 V gate drive, but the device is also characterised at 5 V (drive voltage range 5 V to 10 V), so a logic-level gate driver can turn it fully on if the supply is at least 5 V. Gate charge is 110 nC at 5 V — moderate for a 55 V / 80 A die, meaning a standard gate-driver IC can switch it in the tens-of-kilohertz range without excessive drive loss.