Hybrid Wire Bond Pad Layout for Semiconductor Die Reliability
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Solution Overview
Problem
Conventional bond pad designs for semiconductor dies face reliability issues due to overlapping bond and probing areas, leading to space constraints and potential bond wire lift problems, which affect bonding integrity.
Innovation Solution
The development of hybrid wire bond pads with outer pads elongated parallel to the die edge and inner pads elongated perpendicular to the edge, allowing for separate wire bonding and probing areas, thereby optimizing space usage and reducing size requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If bond pads are designed with overlapping bond area and probing area to save space, then the die size is reduced, but bonding integrity deteriorates due to bond wire lift problems
Solution Approach 1:
The bond pad is segmented into distinct probing area and bond area portions, arranged in a linear configuration along the pad length. This segmentation allows the probing area to be positioned at one end for test probing operations while the bond area is positioned at the other end for wire bonding, eliminating the overlap that causes bond wire lift problems while maintaining compact space utilization.
Solution Approach 2:
The bond pad layout transitions from a two-dimensional overlapping arrangement to a one-dimensional linear arrangement. By elongating the bond pad in one direction and positioning the probing and bond areas at opposite ends along this length, the design eliminates spatial conflict between probing and bonding operations while maintaining efficient space usage along the pad's longitudinal axis.
2Reliability
If bond pads are designed as long pads to separate bond area and probing area, then bonding integrity is improved, but die size increases due to space consumption
Solution Approach 1:
Different regions of the bond pad are assigned specific functions: the probing area at one end is optimized for test probing operations while the bond area at the other end is optimized for wire bonding. This local differentiation allows each area to be precisely sized for its specific purpose, avoiding the need for excessive pad length while ensuring adequate separation for reliable bonding.
3Area of stationary object
If conventional short pad design with overlapping areas is used, then die size is reduced, but reliability deteriorates due to bond wire lift problems
Solution Approach 1:
The bond pad is segmented into distinct probing area and bond area portions, arranged in a linear configuration along the pad length. This segmentation allows the probing area to be positioned at one end for test probing operations while the bond area is positioned at the other end for wire bonding, eliminating the overlap that causes bond wire lift problems while maintaining compact space utilization.
Data Source
AI summary
Apparatus and methods are provided for bond bads layout and structure of semiconductor dies. According to various aspects of the subject innovation, the provided techniques may provide a semiconductor die that may comprise an outer bond pad elongated in a first direction parallel to an edge of the semiconductor die and an inner bond pad elongated in a second direction perpendicular to the edge of the semiconductor die. The outer bond pad may have a probing area and two wire bond areas aligned in the first direction and the inner bond pad may have one probing area and one wire bond area aligned in the second direction. The outer bond pad may be positioned closer to the edge of the semiconductor die than the inner bond pad.