NDLI: Copper, Silver, and PCC Wirebonds Reliability in Automotive Underhood Environments

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Copper, Silver, and PCC Wirebonds Reliability in Automotive Underhood Environments

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Copper, Silver, and PCC Wirebonds Reliability in Automotive Underhood Environments

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Lall, Pradeep Deshpande, Shantanu Nguyen, Luu
Copyright Year	2018
Abstract	Wire bonding is popular first-level interconnect method used in the semiconductor device packaging. Gold (Ag) wire is often used in high-reliability applications. Typical wire diameters vary between 0.8mil to 2mil. Recent increases in the gold-price have motivated the industry to search for alternate materials candidates for use in wirebonding. Three of the leading candidates are Silver (Ag), Copper (Cu), and Palladium Coated Copper (PCC). The new material candidates are inexpensive in comparison with gold and may have better electrical, and thermal properties, which is advantageous for fine pitch-high density electronics. The transition, however, comes along with few trade-offs such as narrow process window, higher wire-hardness, increased propensity for chip-cratering, lack of reliability knowledge base of when deployed in harsh environment applications. Relationship between mechanical degradation of the wirebond and the change in electric response needs to be established for better understanding of the failure modes and their respective mechanisms. Understanding the physics of damage progression may provide insights into the process parameters for manufacture of more robust interconnects. In this paper, a detailed study of the electrical and mechanical degradation of wirebonds under high temperature exposure is presented. Four wirebond candidates (Au, Ag, Cu and PCC) bonded onto Aluminum (Al) pad were subjected to high temperature storage life until failure to study the degradation of the bond-wire interface. Same package architecture and electronic molding compound (EMC) were used for all four candidates. Detailed analysis of intermetallic (IMC) phase evolution is presented along with quantification of the phases and their evolution over time. Ball shear strength was measured after decapsulation. Measurements of shear strength, shear failure modes, and IMC composition have been correlated with the change in the electrical response. Change in shear strength and different shear failure modes for different wirebond systems are discussed in the paper.
Sponsorship	Electronic and Photonic Packaging Division
File Format	PDF
ISBN	9780791851920
DOI	10.1115/IPACK2018-8358
Conference Proceedings	ASME 2018 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems
Language	English
Publisher Date	2018-08-27
Publisher Place	San Francisco, California, USA
Access Restriction	Subscribed
Subject Keyword	Molding Intermetallic compounds Aluminum Shear strength Electronics Palladium High temperature Wire Density Physics Thermal properties Silver Storage Wire bonding Tradeoffs Copper Reliability Shear (mechanics) Damage Failure Semiconductor device packaging Failure mechanisms
Content Type	Text
Resource Type	Article

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