Through Super Bowl XLIII, only one.
Elvis Grbac of the San Francisco 49ers threw one pass, an incompletion, in Super Bowl XXIX against the San Diego Chargers. Grbac came in the game with 6:08 left in the 4th quarter and the 49ers ahead, 49-18. The 49ers ultimately won the game 49-26.
There has been one other rookie quarterback to take a snap from center in a Super Bowl and that was Mike Rae of the Oakland Raiders in Super Bowl XI. He entered the game with 4:49 left in the 4th quarter and the Raiders ahead, 32-7. He did not throw any passes. The Raiders ultimately won the game 32-14.
Kerry Collins
The longest pass completion in Super Bowl history was 85 yards when Muhsin Mahammad hauled in a pass for the Carolina Panthers in Super Bowl XXXVIII. This is not a touchdown pass just a completion pass.
The longest touch down pass thrown in Super Bowl history was by Jake Delhomme in Super Bowl XXXVIII vs the New England Patriots. Delhomme threw an 85 yard bomb to wide receiver Steve Smith.
Tom Brady
Very few, Antwaan Randle El was the last player to do so in Super Bowl XL.
Not in Super Bowl XVIII but I remember a couple of TD passes thrown by non quarterbacks. Running back Lawrence McCutcheon of the Los Angeles Rams threw a TD pass to Ron Smith in Super Bowl XIV and running back Robert Newhouse of the Dallas Cowboys threw a TD pass to Golden Richards in Super Bowl XII.
the longest pass in super bowl 45 was 31 YDS
No quarterback from USC has started and won a Super Bowl but there have been a couple that won as backups. Rob Johnson was the backup QB for the 2002 Tampa Bay Buccaneers that won Super Bowl XXXVII. Mike Rae was the backup QB for the 1976 Oakland Raiders that won Super Bowl XI.
Jake Delhomme of the Panthers threw the longest Super Bowl pass to Muhsin Muhammed for an 85 yard TD in Super Bowl XXXVIII against the Patriots.
He had 6 points off of a touchdown pass thrown to him by another wide receiver Antwaan Randle El.
No... but he did pass for 5 in the second quarter. Until that time no one had thrown more than 4 in an entire game. His receiver caught more yards than any other up until that time as well as his rookie running back (who never started a game until this super bowl) and ran for more than 200 yards... breaking Marcus Allens record!
Mel Renfro Mel Renfro of the Dallas Cowboys intercepted Unitas's last Super Bowl pass.