Exposed Bond Wire Loop in Molded Modules for Pre-Lamination Testing
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Solution Overview
Problem
Existing semiconductor module fabrication processes face challenges in performing electrical functionality tests before critical steps, such as lamination, to avoid costly rejects and potential damage to semiconductor dies during grinding or drilling processes due to height tolerances.
Innovation Solution
A semiconductor module design where a bond wire loop is exposed from a molded body, allowing for pre-lamination electrical testing and reducing the risk of die damage during interconnect fabrication. The module includes a substrate, a semiconductor die, at least one bond wire loop coupled to the die's electrode, and a molded body that encapsulates the die with the bond wire loop's top portion exposed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the semiconductor die is fully encapsulated in the molded body before electrical testing, then the module structure is complete and protected, but electrical functionality testing cannot be performed prior to lamination
Solution Approach 1:
The bond wire loop is extracted from the fully encapsulated state and deliberately left exposed at the top surface of the molded body. This allows the bond wire to serve dual purposes: maintaining electrical connectivity while enabling external electrical testing before lamination, thus resolving the contradiction between complete encapsulation and testing accessibility.
Solution Approach 2:
Electrical functionality testing is performed on the bond wire loop before the lamination step. By making the bond wire accessible through partial exposure, the system enables preliminary electrical validation, allowing defective modules to be identified and rejected before committing to the lamination process, thereby improving reliability without requiring complete encapsulation.
2Productivity
If the semiconductor die is exposed for electrical testing, then pre-lamination testing is enabled, but the die is vulnerable to damage during grinding or drilling processes
Solution Approach 1:
Instead of exposing the semiconductor die itself, only the bond wire loop is extracted and left exposed. The bond wire serves as a test probe extension, allowing electrical testing to be performed on the die indirectly through the wire. This resolves the contradiction by enabling testing without exposing the fragile die to mechanical damage risks.
Solution Approach 2:
The bond wire loop acts as an intermediary element between the testing equipment and the semiconductor die. It transmits electrical signals for testing while isolating the die from direct mechanical contact with testing equipment, thus enabling defect detection efficiency without exposing the die to harmful mechanical factors.
3Reliability
If continuous bond wire is used instead of segmented wires, then electrical connectivity is maintained, but the bond wire is more susceptible to mechanical damage
Solution Approach 1:
The bond wire structure is segmented into multiple sections along its length, creating small loops rather than a single continuous wire. This segmentation provides mechanical flexibility and stress distribution, reducing the risk of complete wire failure. The segmented structure maintains electrical connectivity through each segment while improving mechanical durability by preventing single-point failures.
Data Source
AI summary
A semiconductor module includes a substrate, a semiconductor die arranged on the substrate, at least one first bond wire loop, wherein both ends of the at least one first bond wire loop are arranged on and coupled to a first electrode of the semiconductor die, and a molded body encapsulating the semiconductor die, wherein a top portion of the at least one first bond wire loop is exposed from a first side of the molded body.