Patent ID: 9685402
Date: 2017-06-20
CPC Classifications: H01L,H05K

Claim:
1. A method of making a semiconductor device, comprising: providing a flip-chip semiconductor die including a first bump which comprises a first conductive pillar and a first conductive cap formed on a surface of the flip-chip semiconductor die; providing a substrate; forming an insulating layer over the substrate; forming a first conductive trace over the insulating layer, wherein a length of the first conductive trace is greater than a width of the first conductive trace and the first conductive trace includes a first open channel formed within an interior region of the first conductive trace, wherein the first open channel extends along a portion of the length of the first conductive trace under the first bump and in opposing directions beyond a footprint of the first bump to terminate within the interior region of the first conductive trace and further extends in-depth to the insulating layer; bonding the flip-chip semiconductor die to the substrate by bringing the first conductive cap in contact with the first conductive trace and reflowing the first conductive cap, wherein a portion of the first conductive cap flows into the first open channel; and detecting electrical continuity between the first bump and the first conductive trace by a detectable presence of the portion of the first conductive cap in portions of the first open channel of the first conductive trace which extend in opposing directions beyond the footprint of the first bump.