Application of coupled electro-thermal and physics-of-failure-based analysis to the design of accelerated life tests for power modules

Musallam, Mahera and Yin, Chunyan and Bailey, Chris and Johnson, C. Mark (2014) Application of coupled electro-thermal and physics-of-failure-based analysis to the design of accelerated life tests for power modules. Microelectronics Reliability, 54 (1). pp. 172-181. ISSN 0026-2714

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Abstract

In the reliability theme a central activity is to investigate, characterize and understand the contributory wear-out and overstress mechanisms to meet through-life reliability targets. For power modules, it is critical to understand the response of typical wear-out mechanisms, for example wire-bond lifting and solder degradation, to in-service environmental and load-induced thermal cycling. This paper presents the use of a reduced-order thermal model coupled with physics-of-failure-based life models to quantify the wear-out rates and life consumption for the dominant failure mechanisms under prospective in-service and qualification test conditions. When applied in the design of accelerated life and qualification tests it can be used to design tests that separate the failure mechanisms (e.g. wire-bond and substrate-solder) and provide predictions of conditions that yield a minimum elapsed test time. The combined approach provides a useful tool for reliability assessment and estimation of remaining useful life which can be used at the design stage or in-service. An example case study shows that it is possible to determine the actual power cycling frequency for which failure occurs in the shortest elapsed time. The results demonstrate that bond-wire degradation is the dominant failure mechanism for all power cycling conditions whereas substrate-solder failure dominates for externally applied (ambient or passive) thermal cycling.

Item Type: Article
Schools/Departments: University of Nottingham, UK > Faculty of Engineering > Department of Electrical and Electronic Engineering
Identification Number: 10.1016/j.microrel.2013.08.017
Depositing User: Eprints, Support
Date Deposited: 23 Jan 2018 10:49
Last Modified: 24 Jan 2018 02:35
URI: http://eprints.nottingham.ac.uk/id/eprint/49287

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