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Controlled Impedance PCB Manufacturing

Impedance is a stackup outcome—not a trace-width guess. MOZPCB builds boards to documented targets with coupon plans and tolerances your SI team can measure against.

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Multilayer PCB suited for controlled impedance routing
Stackup-controlled multilayer build

Service overview

Controlled impedance PCBs require agreement on dielectric thickness, copper weight, reference planes, trace geometry, and acceptable tolerance before CAM—not after first article. A layout with correct-looking widths but wrong dielectric assumptions will fail tuning even when the board matches the Gerber.

MOZPCB reviews impedance tables alongside fabrication data: which layers reference which planes, whether coplanar or microstrip structures apply, and whether differential pairs need gap control as well as width. We panelize test coupons when the RFQ requires evidence, and we document the stackup the quote assumes.

Programs range from single 50 Ω lines on a 4-layer board through multi-gigabit differential pairs on 10+ layer stackups and RF-adjacent digital sections on hybrid laminates. Tighter tolerances are available when the geometry and material set support them—stated explicitly in the quote rather than implied.

What we offer

  • Stackup design assistance aligned to your impedance targets
  • Single-ended and differential pair control with documented tolerances
  • Microstrip, stripline, and coplanar waveguide geometries
  • Test coupon design and panelization for measurement
  • TDR reports on agreed builds when required
  • Hybrid stackups combining FR-4 and controlled-Dk laminates
  • DFM feedback on reference plane continuity and return-path breaks
  • Coordination with assembly finish and reflow plans that affect impedance

Technical capabilities

  • Typical tolerance ±10% standard; ±7% and ±5% reviewed per construction
  • Dielectric thickness control through agreed laminate sets
  • Line width and space limits tied to copper weight and imaging capability
  • Coupons on production panels or dedicated test panels per agreement
  • Back-drilling for stub reduction on thick high-speed builds

Common applications

  • High-speed digital backplanes and switch fabrics
  • DDR and SerDes channels on dense mainboards
  • Ethernet, USB 3.x, and PCIe routing
  • RF-adjacent digital sections requiring stable Dk
  • Industrial vision and acquisition with long matched pairs

How the process works

  1. 01

    Requirements intake

    Share Gerber, BOM, drawings, quantities, and any reliability or compliance notes.

  2. 02

    Technical alignment

    We confirm materials, finishes, assembly flow, and test expectations with you.

  3. 03

    Production & inspection

    Manufacturing and assembly follow the agreed traveler with documented checks.

  4. 04

    Delivery

    Packing, labeling, and shipment according to your logistics instructions.

Fabrication & impedance coupons

  • PCB copper plating line
    Plating line
  • Panelized PCBs after fabrication
    Panelized boards
  • Laminate and core material storage
    Laminate store

Related services

Multilayer PCB Manufacturing Services High-Frequency PCB Manufacturing Services View PCB capabilities Request a quote

FAQ

What should an impedance table include?
Target ohms, tolerance, layer, reference plane(s), trace geometry if fixed, and whether the structure is single-ended or differential. Note coplanar ground spacing if used.
How tight can impedance tolerance be?
±10% is common on standard FR-4 multilayer. ±7% is achievable on many controlled builds; ±5% requires tighter etch control and more coupon testing—priced accordingly.
Do you provide TDR reports?
Yes, when agreed in the RFQ. Specify which nets or coupon structures need reporting and the acceptance format your team expects.
Does surface finish affect impedance?
Slightly, especially on outer-layer microstrip at high frequency. Finish choice should be part of the RFQ when margins are tight—we factor it into review.

Get started

Ready for the next step?

Send your project files and requirements. We will review stackup, assembly, and test needs, then respond with a clear quotation path.

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