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An interposer is a thin substrate positioned between a semiconductor device, such as a BGA and PCBA, containing conductive features that allow electrical connections to be rerouted, recreated, or modified between the component and the PCB. Interposers may be manufactured from organic materials such as polyimide or FR-4, as well as silicon, glass, or other specialized materials. In PCB rework, they are most commonly used when the existing board design cannot easily be modified through conventional rework techniques.

As semiconductor packages become smaller and more complex, PCB designers face increasing pressure to accommodate higher interconnect densities within tighter space constraints. Every layer interconnect (ELIC) technology offers a way to overcome some of the limitations of traditional HDI construction, but achieving greater density introduces new challenges in fabrication, reliability, and cost. In his white paper, ELIC: Every Layer Interconnect—The Promise, the Pain, and the Practical Limits, ASC President and CEO Anaya Vardya examines the advantages of ELIC architecture, the manufacturing challenges that accompany it, and the design decisions that determine whether a board can be produced reliably at scale.

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