Chip scale package structure with can attachment
View Patent ↗A chip scale package (CSP) device includes a CSP having a semiconductor die electrically coupled to a plurality of solder balls. A can having an inside top surface and one or more side walls defines a chamber. The CSP is housed in the chamber and is attached to the inside top surface of the can. A printed circuit board is attached to the solder balls and to the one or more side walls to provide support to the CSP and to the can. The CSP may be a Wafer-Level CSP. The can may be built from a metallic substance or from a non-metallic substance. The can provides stress relief to the CSP during a drop test and during a thermal cycle test.
1. Apparatus, comprising:
a frame including a top member and a plurality of wall members, wherein the plurality of wall members define a plurality of chambers, each chamber having an inside top surface;
at least one chip scale package in each of the plurality of chambers, each chip scale package having a front surface to which a plurality of solder balls are attached;
wherein each chip scale package is attached to the inside top surface of the chamber;
wherein each wall has a length extending at least to the front surface of the attached chip scale package; and
wherein each wall is configured to permit the frame to be diced through the walls and between the chambers into a plurality of metal cans, each metal can including at least one chamber containing at least one chip scale package, and each can having a peripherally surrounding side wall formed from the diced through walls of the frame.
2. The apparatus according to claim 1 , wherein the chip scale package includes a metallic layer formed over a semiconductor die, the solder balls being attached to the metallic layer.
3. The apparatus according to claim 1 , wherein the chip scale package is a Wafer-Level chip scale package.
4. The apparatus according to claim 1 , wherein the frame is made from a metal substance.
5. The apparatus according to claim 1 , wherein the frame is made from a non-metal substance.
6. The apparatus according to claim 1 , wherein the peripherally surrounding side walls are spaced from an edge of the chip scale package by a distance.
7. The apparatus according to claim 1 , wherein the inside top surface defined by the chamber is square.
8. The apparatus according to claim 1 , wherein the inside top surface defined by the chamber is rectangular.
9. The apparatus according to claim 1 , wherein the frame further includes an opening formed in the inside top surface that exposes at least a portion of a back surface of a semiconductor die for the chip scale package.
10. The apparatus according to claim 1 , wherein the peripherally surrounding side wall has a length extending beyond the front surface of the chip scale package.
11. The apparatus according to claim 10 , wherein: each solder ball has a PCB attaching portion for attaching to a surface of a PCB, and the length of the peripherally surrounding side wall extends such that a bottom surface of the one or more side walls is aligned with the PCB attaching portion.