4-Layer PCBs
Four layers add an internal power plane and ground plane between the two signal layers. That gives you cleaner power distribution, a solid return path for high-speed signals, and room to route dense designs that won't fit in two layers.
Get an instant quote →Why move up from 2 layers
A dedicated ground plane directly under your signals dramatically improves signal integrity and EMI behavior — it's the single biggest reason designers move to four layers. You also free up the outer layers for routing instead of spending them on power distribution.
Typical 4-layer designs: multi-rail power supplies, boards with fast digital interfaces (USB, Ethernet, DDR), RF front-ends, and anything dense enough that 2-layer routing turns into a maze.
Stackup and tolerances
Standard 4-layer stackup on FR-4, 0.062" finished thickness, with the inner layers as power and ground. Finer 5/5 mil trace/space is available, and 4/4 mil with an ENIG finish for the tightest designs.
Every tolerance you pick is validated against the rest of your spec in the configurator, so you never quote a combination that can't be built.
Frequently asked questions
Is a 4-layer board much more expensive than 2-layer?
There's a step up for the extra layers and lamination, but for dense or high-speed designs it often saves money overall by avoiding respins. Quote both in the configurator to compare instantly.
Can you do controlled impedance on 4-layer boards?
Controlled-impedance stackups are on our roadmap. For now the configurator quotes standard 4-layer builds; contact us for impedance-controlled requirements.
What finish should I use for a 4-layer board?
ENIG is the common choice for dense, fine-pitch 4-layer boards because of its flat surface and fine-pitch compatibility. See our ENIG vs HASL guide.
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