Blind and Buried Microvias

Blind and buried vias are essential components in Printed Circuit Board (PCB) design, enabling complex electrical connections within layers of a circuit board while optimizing space in compact electronic devices. These vias require creating tiny apertures and pathways in the substrate, typically comprised of FR-4 or other high-performance materials, to facilitate seamless connections throughout the board, especially when spatial constraints demand advanced solutions.

Blind vias connect outer layers to one or more inner layers, saving space and minimizing signal stubs during drilling, which enhances signal integrity. Buried vias establish connections solely within inner layers, conserving valuable real estate without disturbing top or bottom layer components or traces. These vias are particularly prominent in High-Density Interconnect (HDI) PCBs, crucial for miniaturization and enhanced performance in devices like cell phones, laptops, wearables, and medical equipment.

However, integrating blind and buried vias poses challenges, adding complexity and escalating production costs. Careful drill depth consideration is vital to avoid signal distortion or improper connections, necessitating collaboration with PCB manufacturers to optimize design and mitigate manufacturing risks.

Manufacturing these vias involves meticulous drilling, whether through mechanical or laser methods, and plating processes, as outlined in PICA internal workmanships. Precision is crucial to ensure reliable connections and mitigate risks of voids or pinholes in solder joints.

At PICA, we specialize in blind and buried via technology, employing laser drilling, vapor formation, dielectric material application, and precise layer stacking and lamination. Laser technology controls via size, shape, and depth, ensuring reliable connections in complex circuitry while minimizing interference and crosstalk.

Beyond manufacturing, we provide technical consultancy, offering design insights and manufacturing advice to clients. With PICA, you can trust that your blind and buried Microvias meet the highest standards of performance and reliability. Contact us for inquiries about our capabilities with blind and buried vias.