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A study was performed to develop a different experimental methodology to assess wettabilities of solders on various printed wiring board (PWB) finishes, based on a modified spreading test in which solder pastes were heated following temperature reflow profiles representative of those used in...
A computational parametric study on the solder joint reliability of a plastic ball grid array (PBGA) with solder bumped flip chip (FC) is presented. The basic configuration of the PBGA is 27mm package‐size and 1.27mm ball‐pitch. There were three kinds of ball population: four‐row perimeter grid...
Gold coatings are used on connector structures to maintain suitable solderability of the underlying Ni coating layer as well as to prevent surface corrosion during service. However, the likelihood of Au embrittlement in connector solder joints must be minimized by eliminating much of the Au...
A viscoplastic constitutive model, the Anand model, in which plasticity and creep are unified and described by the same set of flow and evolutionary relations, was applied to represent the inelastic deformation behavior for solder alloys. After conducting creep tests and constant strain rate...
The impact of underfill properties on the thermomechanical reliability of flip chip on board (FCOB) assembly is addressed in this paper. FCOB assemblies using three underfill encapsulants were subjected to a thermal cycling test. The performance of the underfill encapsulants was assessed by a...
Owing to the demands of increasing I/O counts and thermal performance BGA (ball grid array) type packaging concepts are rapidly gaining in popularity. Use of various modelling tools is an obvious way to save resources by discarding the most unreliable solutions before wasting testing capacity. A...
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