The youngsters, who dispatched Cheltenham Town, Millwall, Blackpool and Leicester City along the way to reach the semi-finals, edged a close affair at Villa Park.
Joe Ironside's goal just before half-time was the only goal of the game, but the night ended on a sour note when Blades striker Jordan Slew was dismissed in an off-the-ball incident with Villa's Devine - the latter was also sent off.
United soaked up the Villa pressure and held on for a fantastic 0:1 victory, a lead which they will take into the second-leg at Bramall Lane on Wednesday 6th April.
Below are a few photos from tonight's (Wednesday's) game:
Images copyright to Action Images