Structure, features and applications of both board classes, the three-dimension comparison and how to choose between them without overbuilding.
The stack is minimal — a copper foil conductive layer, an insulating substrate of epoxy resin or FR-4, and a surface treatment such as gold or tin plating for solderability. That simplicity is the feature set:
Three application zones dominate:
The stack adds copper layers interconnected by vias — through-holes, blind vias and buried vias — with high-performance insulation such as FR-4 between each pair. The capability set follows:
Density and integrity buy entry into four major fields:
Both board classes feed the wider deployment map surveyed in the high-frequency circuit board applications overview — single-sided at the volume end, multilayer everywhere performance lives.
The trade-offs reduce to three dimensions:
Frequently Asked Questions
When the circuit is genuinely simple, the frequency is low and cost dominates — appliances, toys, basic industrial controls. Paying for layers the design does not use is waste.
Through-holes connect all layers, while blind vias link outer to inner layers and buried vias link inner layers only — the denser via structure is what frees routing space in high-layer-count designs.
Dedicated power and ground planes shield signal layers, shorten return paths and reduce crosstalk — structure a single-layer board cannot offer.
It scales with layer count and material. A simple 4-layer FR-4 board is only modestly more expensive than double-sided; the gap grows with density, materials and via technology.
Tell us your circuit complexity, frequency and budget and we will recommend the board class and stack-up that fits without overbuilding.
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