Custom Impedance Controlled PCB with ±5% Tolerance, 3/3 Mil Fine-Line Capability, and Backdrilling

Custom Impedance Control PCB (±5% Tolerance)

Huayihai fabricates custom impedance-controlled PCBs with a ±5% impedance tolerance. Controlled impedance keeps transmission lines at their target value — typically 50 ohm single-ended or 90/100 ohm differential — so high-speed signals arrive with predictable rise time, reflection behavior, and loss.

Impedance control depends on trace geometry, dielectric thickness, and material choice, all defined by the stack-up. Huayihai reviews the stack-up against the customer's impedance targets before production, then fabricates with 3/3 mil fine-line capability and verifies the result under IPC-A-600 workmanship standards.

Custom Manufacturing Only

We fabricate impedance-controlled PCBs according to customer Gerber files and technical specifications. We do not supply ready-made or standard stock boards.

Product Specifications

Key Features

• ±5% impedance tolerance

• Single-ended and differential impedance targets

• 3/3 mil fine-line capability for tight trace geometry

• Low-loss material options: Rogers, PTFE, Nelco

• Backdrilling available to remove via stubs

• Manufactured under IPC-A-600 workmanship standards

Manufacturing Highlights

Impedance accuracy is settled before drilling starts: stack-up geometry, dielectric thickness, and copper weight must support the target values. Huayihai reviews the impedance scheme with the customer, fabricates to the approved stack-up, and verifies finished boards by impedance measurement.

Key fabrication elements include:

• Stack-up and impedance target review

• Trace geometry defined from the approved stack-up

• Material selection matched to loss and impedance requirements

• Controlled etching for consistent line width

• Backdrilling of stubs on high-speed channels where specified

• Impedance measurement and 100% electrical testing

Typical Applications

Impedance-controlled PCBs suit high-speed digital and RF designs:

• Communication and Data Transmission Equipment

• High-Speed Digital Boards

• Backplanes and Connector Interfaces

• RF and Microwave Modules

• Test and Measurement Instruments

• Other High-Speed Applications

Why Choose Huayihai

• Over 20 years of PCB manufacturing experience

• ±5% impedance tolerance confirmed by process capability

• 3/3 mil line width and spacing for tight geometry

• Backdrilling and low-loss material options in house

• Quality management based on ISO 9001, ISO 13485, IATF 16949 and UL

• Prototype, low-volume, and mass production support

Manufacturing Process

• Gerber file, stack-up, and impedance review (2–5 working days engineering review)

• Material selection and lamination

• Drilling and plating

• Outer layer imaging with controlled line width (3/3 mil)

• Backdrilling where specified

• Impedance measurement, electrical testing, final inspection

FAQ

Q1: What impedance tolerance can Huayihai hold?

±5% on controlled impedance boards.

Q2: Which impedance values are typical?

50 Ω single-ended and 90 Ω or 100 Ω differential are common; targets are set per customer requirement.

Q3: How is impedance verified?

Finished boards are measured against the specified impedance targets before shipment.

Q4: Can impedance control be combined with backdrilling?

Yes, backdrilling removes via stubs on high-speed channels.

Q5: What is the standard lead time?

3–5 working days for PCB prototypes and batches, after file review is complete.

Request a Quote

Need impedance-controlled PCBs with ±5% tolerance?

Send us your Gerber files and stack-up details for a quotation. Learn more at nexuspcba.com.