DeBrincat is on the final year of his entry-level deal, and his extension keeps him with the Blackhawks through the 2022-23 season. He'll become a restricted free agent when it expires.
The 21-year-old broke out last season, recording 41 goals and 76 points over 82 games in his second NHL campaign.
DeBrincat was a steal for Chicago in the second round of the 2016 NHL Draft. He ranks fourth in both points (128) and goals (69) among all players from that class.
By extending DeBrincat, Blackhawks general manager Stan Bowman did his best to get ahead of what could be a very busy 2020 offseason for the club. Young forwards Dylan Strome, Drake Caggiula, Brendan Perlini, and Dominik Kubalik are all set to become restricted free agents next summer.