Mechanical Evaluation of the Euler Test Probe

The density limitations of conventional cantilever probes make it necessary to investigate alternative probing techniques for advanced VLSI package testing. Our study contains a theoretical and experimental evaluation of wires in an Euler test probe. We analyze wire pre- and postbuckling behavior including axial and lateral deflections and stresses, with consideration of the initial curvature and end off-set. The developed formulas are simple, easy-to-use and clearly indicate the role of various factors affecting the mechanical behavior of the wires.