US 12,451,383 B2
Corner relief undercut to reduce die damage
Hermie Dela Torre, Chicago, IL (US); Librado Galang, Chicago, IL (US); Jason Costoya, Chicago, IL (US); and Nathaniel Garcia, Chicago, IL (US)
Assigned to Littelfuse, Inc., Rosemont, IL (US)
Filed by Littelfuse, Inc., Chicago, IL (US)
Filed on Jan. 29, 2024, as Appl. No. 18/424,994.
Prior Publication US 2025/0246465 A1, Jul. 31, 2025
Int. Cl. H01L 21/673 (2006.01)
CPC H01L 21/67333 (2013.01) 14 Claims
OG exemplary drawing
 
1. A die carrier, comprising:
a recess operable to receive a die, the recess comprising:
a central area defined by a set of sidewalls; and
a plurality of corner areas extending from the central area, each of the plurality of corner areas defined by a first curved wall, a second curved wall connected to the first curved wall, and a third curved wall connected with the second curved wall, wherein a first center of curvature of the first curved wall is in a different location than a second center of curvature of the second curved wall, wherein the first curved wall defines a first radius of curvature and a first imaginary circle, wherein the second curved wall defines a second radius of curvature and a second imaginary circle, and wherein the third curved wall defines a third radius of curvature and a third imaginary circle, wherein the first radius of curvature, the second radius of curvature, and the third radius of curvature each have a same length, and wherein the first, second, and third imaginary circles overlap with one another.