IPC International Community magazine an association member publication
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66 I-CONNECT007 MAGAZINE I MAY 2026 Key process gaps that manufacturers must address include: • Stencil design for ultra-fine pitch on flex, where substrate deflection affects paste volume consistency • Fixture and carrier systems that maintain dimensional stability during reflow without constraining flex behavior • Underfill dispensing processes calibrated for the compliance mismatch between silicon packages and polymer substrates Equipment Investment and Qualification Scaling flex–packaging integration requires tar- geted capital investment. High-accuracy pick- and-place systems with active vision correction, laser-based soldering for heat-sensitive areas, and advanced AOI systems capable of inspecting warped or curved surfaces are among the equip- ment upgrades most commonly required. Qualifi- cation of this equipment against hybrid assembly specifications, not traditional PCB or package-level standards, is essential before production launch. Quality Systems and In-Process Control Quality management for hybrid flex–package as- semblies must evolve beyond legacy approaches. Effective in-process control strategies include: • 3D SPI (solder paste inspection) adapted for flex substrate topology • Post-reflow X-ray inspection of BGA and LGA joints on compliant surfaces • Mechanical bend and thermal cycle qualifica- tion protocols specific to the flex–package assembly Conclusion The technology case for flex–packaging integra- tion is well established. The remaining challenge is execution at volume. Manufacturers who invest now in process development, equipment qualifi- cation, and adapted quality systems will be po- sitioned to serve the growing wave of demand from automotive, medical, and high-performance computing customers. Production readiness, not just design capability, is the next frontier for this convergence. I-CONNECT007 Anaya Vardya is president and CEO of American Standard Circuits; co-author of The Printed Circuit Designer's Guide to… Fun- damentals of RF/Microwave PCBs and Flex and Rigid-Flex Fundamentals. He is the author of Thermal Management: A Fabricator's Perspec- tive, The Printed Circuit Designer's Guide to DFM Essentials, and The Companion Guide to Flex and Rigid-Flex Fundamentals. Visit I-007eBooks.com to download these and other free, educational titles