55 V, 80 A N-channel — TO-220 power switch
The STP80NF55-08 is an N-channel STripFET™ power MOSFET from STMicroelectronics, housed in a through-hole TO-220-3 package.
NRND — plan the last-time-buy window
This means ST is signalling the part will transition to end-of-life — it is not yet obsolete, but new designs should not use it. Existing production lines should qualify an alternative and secure last-time-buy stock before the official EOL notice arrives. The official replacement has not been published in the available lifecycle records; a pin-compatible substitute from the same STripFET™ family should be evaluated for ongoing builds.
At 80 A the Rds(on) will be higher due to self-heating, so thermal derating matters — the 300 W package dissipation limit and 175°C junction maximum set the real safe operating area.
TO-220 mounting and thermal management
The through-hole TO-220-3 package bolts to a heatsink or chassis for thermal dissipation. The tab is the drain terminal, so insulating hardware or a thermal pad may be needed depending on the heatsink potential. With 300 W maximum dissipation at the case, a low thermal-resistance path is mandatory for sustained high-current operation.