PCB Manufacturing in China: Services, Specs & Lead Times

PCB manufacturing begins with a buildable specification: the board construction, materials, copper, holes, surface finish and acceptance requirements that turn a circuit layout into a physical product. PCB Manufacturer in China helps engineers and buyers prepare fabrication inquiries for rigid, multilayer, HDI, flex and rigid-flex boards, from an initial prototype through repeat production.

Choose the board family below, review the capability reference, and send one consistent manufacturing package. Final feasibility, material availability, tolerances, production quantity and delivery dates are confirmed for the submitted design. A published process limit is a starting point for engineering review, not an approval of every combination of features.

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Choose the PCB construction around the product

The right fabrication route is the least complex construction that meets your electrical, mechanical and reliability requirements. Start with the constraints that cannot change, such as an enclosure interface, connector footprint, operating environment or approved laminate. Then identify which features remain open to a manufacturing recommendation.

Rigid and multilayer PCB manufacturing

A rigid PCB inquiry should define the complete finished board, not just its number of layers. Two boards with the same layer count can require different materials, hole structures and process controls. Identify the signal and plane layers, finished board thickness, internal and external copper requirements, solder mask, legend and surface finish.

For a new layout, request stack-up review before the routing rules are fixed. Explain whether the overall thickness is constrained by a connector or enclosure, and which dielectric separations matter electrically. When a stack-up is already qualified, attach it as a controlled document and state whether substitutions are permitted. Do not leave a critical material selection hidden in an old email thread.

For repeat work, include the previous released revision and a concise change list. A small outline change may affect panelization or an assembly fixture. A revised component footprint may alter mask openings or the inspection plan. Treat the new revision as a controlled release even when most of the copper remains unchanged.

HDI and advanced via requirements

An HDI request needs an explicit via map. Identify the layers each via connects, whether it is stacked or staggered, and whether filling and plating over are required. The reference scope includes laser microvias and sequential build-up constructions; the capabilities page gives the numerical inquiry limits.

Send a cross-section sketch when the construction cannot be understood easily from the fabrication files. Distinguish the intended finished hole from a tool size, and call out via-in-pad locations rather than expecting the reader to infer them. If a component has a restrictive land pattern, include the relevant package drawing and explain which routing dimensions are essential.

Ask for the fabrication proposal to list the agreed via sequence and any deviations. Approving a general statement such as “HDI supported” leaves too much unresolved. Your purchasing and engineering teams should be able to identify the same construction from the final quotation, approved drawing and manufacturing release.

Flex and rigid-flex: specify the mechanical use

Flexibility is a product requirement that needs a drawing and a use description. Explain whether the circuit is folded during installation and then remains still, or moves repeatedly in service. Show bend locations, the required installed geometry, areas that must stay flat and any nearby mechanical restraints.

A flex inquiry should also identify coverlay openings, stiffeners, connector areas and the orientation of the circuit in the finished product. For rigid-flex, show which layers continue through the flexible regions and where the rigid sections end. A single overall layer count does not communicate this construction. The reference describes integrated rigid and flexible sections; its published details are available in the rigid-flex construction reference.

Do not substitute a generic bend-radius value for your actual use conditions. Request a design review against the proposed material and stack-up, then keep the agreed bend restrictions in the product documentation. If you have a mechanical model or assembly sequence, include it with the inquiry so the review can consider how the circuit will be handled.

Materials, copper and surface finish

Specify material by the requirement that matters to your product. If a particular laminate is mandatory, provide its manufacturer and grade and state that an alternative needs approval. If an equivalent is acceptable, define the properties that the proposed substitute must satisfy and request its data sheet before release.

Separate inner-layer copper from finished outer-layer copper in the fabrication notes. State whether a thickness is nominal, minimum or otherwise controlled. For a heavy-copper design, ask the engineer to review copper thickness together with the smallest trace, clearance and hole features. Treating these as independent settings can produce an incomplete specification.

Choose the surface finish with the assembly and end-use requirements in view. Identify contact areas, soldered pads, storage expectations and any finish restrictions in the product specification. If different areas need different treatments, mark them on a drawing. A short, explicit note is easier to control than a comment buried in a file name.

Prepare a fabrication package that can be reviewed

A useful fabrication package combines machine-readable design data with the written requirements needed to interpret it. Gerber files describe the board layers; a separate readable manufacturing drawing can communicate dimensions, tolerances and special instructions. Ucamco, the format developer, explains the roles of layer data and fabrication characteristics in its Gerber format overview.

• Export all required copper, solder mask and legend layers from the same released design.
• Include drill and route data, a clearly defined board profile and a layer map.
• Attach the stack-up, material, thickness, copper and finish requirements.
• Identify controlled impedance nets, targets and the required acceptance evidence.
• Provide quantity options, delivery destination and the requested delivery milestone.
• State the acceptance standard, class, revision and any customer-specific requirements.

Open the exported files in a viewer before sending them. Check that the outline, holes and copper align and that the package contains the intended revision. A screenshot may help explain an issue, but it should accompany the manufacturing data rather than replace it. Use the quote preparation checklist to organize the final package.

Agree the review and release steps

A disciplined release process makes engineering decisions visible before production starts. Use the inquiry to request a written list of questions and proposed changes. Each answer should identify the affected drawing, layer, dimension or requirement, so an approval cannot be confused with a general acknowledgment.

1. Define the scope. Confirm bare-board quantity, supplied files, requested test evidence and delivery destination.
2. Resolve engineering questions. Review material choices, stack-up, manufacturability and any proposed deviations.
3. Approve the production package. Freeze the file revision and retain the accepted drawings and notes.
4. Confirm the order. Check price scope, timing, packaging and documentation against the approved specification.
5. Review delivery evidence. Match labels, quantity and agreed reports to the released part number and revision.

For a first build, decide in advance what will trigger a hold before the next quantity is released. Examples include fit verification, assembly feedback or review of a specific measurement report. This is especially helpful when several teams share responsibility for the board and no single drawing captures all their requirements.

Plan cost and lead time with the same scope

Compare quotations only after the technical assumptions match. Ask whether tooling, electrical testing, special measurements, packaging and freight are included. If a less expensive alternative changes the material, finish, tolerance or test scope, review that change as an engineering decision rather than treating the two prices as equivalent.

Request separate confirmation of the production release date, expected completion milestone and transport arrangement. Material procurement, unresolved engineering questions and customer approvals should be visible in the schedule. If the project has a fixed installation date, communicate that date and the receiving location at inquiry stage; a factory dispatch date alone does not describe the full delivery requirement.

Connect fabrication with assembly and quality

If the board will be assembled, review the panel, tooling holes, fiducials and delivery format with the assembly team before the bare-board order is released. Confirm whether the assembly provider expects individual boards or panels and who owns the panel drawing. See PCB assembly services for BOM, placement and test preparation.

Specify the required inspection and records at the same time as the board construction. The quality guide explains how to connect an acceptance requirement to evidence for an individual order. For a project-specific discussion, email Tina@4PCBA.com or prepare your files and Get a Quote.