McPhadden, from Jacksonville (Fla.) First Coast High School, committed to the Seminoles over NC State.
"Florida State is just the best opportunity for me," McPhadden said Wednesday night.
"I have a great chance to play early and play for a great man like Bobby Bowden. Plus, it is very close to home."
Also committing to FSU Wednesday was Mario Henderson, another offensive line prospect from the state of Florida.