A stable platform for components
Rigid PCBs provide mechanical support and electrical interconnection using copper layers separated by dielectric materials. Layer count should follow routing, reference-plane and power-distribution requirements. Adding layers can improve routing freedom while increasing material and processing requirements.
Start with the stackup
Agree finished thickness, copper distribution, dielectric construction, impedance requirements and via structure before final routing. Material substitutions can change electrical performance and manufacturing behavior, so document the approval process for alternatives.
Make the data package unambiguous
Release the copper images, drill files, outline, netlist, fabrication notes and revision together. Specify plated versus non-plated holes, slots, edge features, solder-mask openings and finish. Any contradiction between a drawing and the digital data should be resolved before production.
When to consider rigid-flex
If the product needs several rigid boards linked by cables, compare the full assembled architecture. Rigid-flex may offer packaging advantages, while separate rigid boards may simplify replacement and service. The decision should include mechanical fit, yield, assembly time and repair strategy.