Bend Testing of Electronic Packages
SEMI G69-0996 | ASTM D790 | ASTM D6272 | IPC TM-650 | JEDEC 9702 | MIL STD 883 | SEMI G86-0303
The Challenge
As electronic packages become smaller, thinner, and more densely populated, understanding their mechanical reliability under bending loads becomes increasingly critical for design validation and quality assurance.
Thinner and More Complex Packages The drive toward hand-held devices has produced PCBs and electronic packages that are significantly thinner than previous generations. New materials and additional layers are regularly introduced — each requiring validation of mechanical strength before a design can be approved for production. The mechanical behavior of these thin, multi-layer structures under bending is fundamentally different from earlier, simpler packages and cannot always be predicted from material data alone.
Assembly-Induced Stress During PCB assembly, components mounted on the top and bottom of the substrate are subjected to warping forces that induce mechanical stress throughout the package. Understanding the magnitude of this stress and its effect on package integrity is essential for OEMs developing new products — particularly as the number of components per board continues to increase.
Emerging Package Technologies New package formats — including chip-on-film and stacked multi-layer packages — present additional mechanical challenges. The complex interfaces between layers, substrates, and interconnections create multiple potential failure sites that require thorough mechanical characterization to understand and control.
Our Solution
Micro Bend Fixtures - Instron's micro bend fixtures are specifically designed for bend testing of small-scale electronic packages and microelectronic components. Both 3-point and 4-point bend configurations are available — 3-point bend applies stress at a local region of the package, while 4-point bend distributes stress more uniformly across the span, allowing different failure mechanisms to be evaluated depending on the test objective.
Using these fixtures, engineers can determine the load at which packages undergo failure — including cracking, layer delamination, and fatigue crack initiation — and characterize the full load-displacement behavior of the package up to and beyond failure.
Adjustable Span and Anvil Configuration - Bend fixtures are available with various anvil radii to suit different package dimensions. Variable span adjustment on the lower anvil is achieved using a micrometer screw gauge, allowing the span length to be precisely set for each package size — ensuring test geometry is accurately reproduced between specimens and across test programs.
Bluehill® Universal Software - Bluehill® Universal software simplifies test method setup for different component sizes and provides the calculation tools needed to derive flexural stress, flexural strain, and modulus from the raw force-displacement data. Where flexure displacement is a required output, a compliance correction routine can be performed to remove system compliance contributions from the measured displacement — ensuring that the reported flexural displacement accurately reflects specimen deformation rather than system deflection.
Talk to an Instron Expert.
Whether you are setting up a new bend test program for electronic packages or looking to improve the accuracy and repeatability of an existing one, our team can help you identify the right fixture configuration, span settings, and system setup for your components and standards.
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