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Polyimides and PBO's

Materials for stress relief buffer coat or redistribution layer

Polyimide and Polybenzoxazole (PBO) products are specialty stress relief coatings used as a protective layer or "buffer coat" before packaging or redistribution layer (RDL).

Buffer coat layers provide protection to the finished die during back grind, singulation and assembly processing resulting in improved packaged yields and increased reliability lifetime performance. Redistribution layer applications enable the most advanced packaging designs.

Product Selection Guide
When selecting a product, first confirm whether it is a positive-type water-based development type or a negative-type solvent development PFAS-free type. For positive-type water-based development types, select from FB5610-07, B5610, FB5610-12, or FB5610-15 based on the cured thickness. For negative-type solvent-based development with PFAS-free type, verify the dielectric requirements, confirm the cured thickness range and choose LTC9310-E19 and LTC9320-E19. If neither applies, consult FFEM.