A 7-0 run got San Diego within five, but Gallinat responded with a jumper then 6 of 10 Pacific free throws to secure the win.
Tripp scored 17 points with 11 rebounds and Miles Reynolds added 13 points for the Tigers (14-14, 9-6 West Coast Conference), who have won four of their last five.
The Tigers opened the second half on a 15-3 run to lead 44-27.
Neubauer got USD off to an 18-8 start, making three 3-pointers and scoring 11 points before the Tigers rallied, getting 14 points from Tripp in the first half and leading 29-24 at the break.
During the Brad Brownell era, Clemson is almost perfect when it locks down on defense.
Kostecka, Champion lead Loyola Greyhounds to win
Andrew Kostecka scored 18 points and Chuck Champion added 17 to lead Loyola (Maryland) to a 75-66 win over Hampton on Tuesday in the Detroit subregional of the Legends Classic.
Graves lifts Sac St. past UC Davis in 70-year-old rivalry
Marcus Graves made a layup with 11 seconds left to give Sacramento State a 58-55 win over UC Davis on Tuesday night at the Golden 1 Center, the home of the NBA's Sacramento Kings.