Three- and four-point bend testing for microelectronic packages

Instron · Reliability qualification and failure analysis

Purpose: Measures force-displacement response of thin, multilayer packages under bending to compare strength and cracking/delamination risk.
Technical approach: Micro 3-point or 4-point fixtures apply loads with selected spans/contact geometry; software derives flexural properties using specimen geometry.
Scope of use: For mechanical comparisons of IC, BGA, COF and stacked packages, with configuration matched to sample size and test objectives.
Limitations and open questions: These evaluation considerations are compiled by BLNKK from public information. They are not supplier guarantees or a mandatory submission checklist.
Scope and limitations
Package bending is not board-level drop or thermal cycling, nor standalone proof of pad cratering or field life.
What to prepare
BLNKK suggests dimensions/stack, orientation, span/rate, preconditioning and force-displacement, electrical or microscopy objectives.
Confirm with the supplier
Confirm fixtures, load cell, failure detection, geometry model and compliance correction, and how results connect to board-level tests and physical evidence.
Public evidence: Instron’s application page covers failure loads and compliance correction; its 2018 brochure and 2025 updated article give microelectronics examples.

Supporting references

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