Five players from
Trojans running back Javorius Allen, receiver Nelson Agholor and center Max Tuerk, defensive lineman Leonard Williams and defensive back-linebacker Su'a Cravens were voted to the team by league coaches.
Bruins defensive back Ishmael Adams also was a first-team choice.
USC, Oregon and
Oregon plays Arizona in the Pac-12 championship game Friday at Levi's Stadium in Santa Clara.
UCLA had eight players voted to the second team: quarterback Brett Hundley, offensive lineman Jake Brendel, defensive lineman Kenny Clark, defensive lineman Owamagbe Odighizuwa, linebackers Myles Jack and Eric Kendricks and defensive backs Anthony Jefferson and Fabian Moreau.
USC receiver and kick returner JuJu Smith was second team as an all-purpose player.
Other first-team offensive players: Utah running back Devontae Booker,
Other first-team defensive players: Stanford lineman Henry Anderson, Utah lineman Nate Orchard,
Thompson also was a first-team special teams selection. Others: Utah kicker Andy Phillips, Utah punter Tom Hackett and Utah return specialist Kaelin Clay.
Jackson is the third USC player in four years to be voted freshman defensive player of the year, joining Dion Bailey (2011) and Williams (2012). Jackson made 42 tackles for USC, including four for losses. He also broke up nine passes and forced a fumble.
Jackson also played receiver, catching seven passes, two for touchdowns. He averaged 27.7 yards per kickoff return, which ranks fourth nationally, and scored on a 100-yard return against Utah.
Allen, a junior, has rushed for 1,337 yards and nine touchdowns. He also has 40 receptions, one for a touchdown.
Agholor, a junior, has 97 receptions, 11 for touchdowns. He eclipsed 100 yards receiving five times and 200 yards twice. He also returned two punts for touchdowns.
Tuerk, a junior, moved to center after starting previous seasons at guard and tackle.
Williams, a junior, has 71 tackles, including 8 1/2 for losses. The 6-foot-5, 300-pound Williams is expected to make himself available for the 2015 NFL draft.
Cravens, who moved from safety to linebacker, has a team-best 16 tackles for losses, including five sacks. He also intercepted two passes, returning one for a touchdown.
Adams, a sophomore, has 30 tackles and returned two interceptions for touchdowns for UCLA. He also returned a kickoff for a touchdown.