US 11,916,030 B2
Method for manufacturing side wettable package
Chung-Hsiung Ho, Kaohsiung (TW); and Chi-Hsueh Li, Tainan (TW)
Assigned to PANJIT INTERNATIONAL INC., Kaohsiung (TW)
Filed by PANJIT INTERNATIONAL INC., Kaohsiung (TW)
Filed on Apr. 22, 2022, as Appl. No. 17/726,863.
Application 17/726,863 is a division of application No. 17/014,417, filed on Sep. 8, 2020, granted, now 11,387,203.
Prior Publication US 2022/0246561 A1, Aug. 4, 2022
Int. Cl. H01L 23/31 (2006.01); H01L 23/00 (2006.01)
CPC H01L 24/05 (2013.01) [H01L 23/3114 (2013.01); H01L 24/03 (2013.01); H01L 24/96 (2013.01); H01L 24/97 (2013.01); H01L 2224/03462 (2013.01); H01L 2224/05557 (2013.01); H01L 2924/1203 (2013.01); H01L 2924/37001 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A method for manufacturing a side wettable package, the method comprising:
manufacturing a semi-finished package being attached on a carrier, wherein the semi-finished product comprises
a lead frame having a bottom surface attached to the carrier and a top surface opposite to the bottom surface;
multiple chips electrically mounted on the top surface of the lead frame; and a molding compound encapsulating the chips and the lead frame;
sawing the molding compound and the lead frame along a predetermined cutting path downward from a top surface of the molding compound to form a plurality of packages separated from each other; wherein the lead frame in each package forms a plurality of conductive pads including peripheral conductive pads distributed near a side wall of the molding compound of the package, and each peripheral conductive pads has a side surface;
over etching each of the peripheral conductive pads to form an undercut at the side surface of the peripheral conductive pad, wherein each undercut has a concave surface curved inward relative to the side wall of the molding compound and having a height equal to a thickness of the peripheral conductive pads; and
electroplating the lead frame to form a protection layer covering each of the conductive pads exposed from the bottom surface of the molding compound and the concave surface of each undercut.