Custom Multilayer PCB Prototyping
Multilayer PCB Prototype Services
Custom multilayer PCB fabrication for engineering samples and design revisions. Submit your proposed stackup, material specifications and impedance requirements for manufacturing review before the prototype build.
- Stackup & Material Review
- Controlled Impedance Requirements
- Revisions & Pilot-Run Planning
Define the Board as a Complete Construction
Multilayer Prototype Fabrication Overview
Start with the manufacturing requirements that define your sample build. Review the stackup, materials, electrical targets and special features together before confirming the fabrication specification.
Layer Construction
Layer Count & Stackup
Provide the proposed layer sequence, finished board thickness and required connections between layers. Identify which stackup details are fixed and which remain open for review.
Material System
Materials & Copper
Specify laminate grades and copper requirements by layer. Distinguish base copper from finished copper and state whether material alternatives may be proposed.
Electrical Targets
Controlled Impedance
Define target values, tolerances and the applicable layers or nets. Include the proposed reference layers and any required verification records.
Fabrication Details
Drilling, Finish & Special Features
Identify finished-hole requirements, surface finish, critical dimensions and any special via, filling or routing features that need engineering confirmation.
Align the Design Intent with the Fabrication Package
Define the Layer Stackup Before Fabrication
A layer count alone does not define a multilayer board. Submit the proposed construction and identify the requirements that are fixed, open for review or subject to your approval.
Layer Sequence & Functions
Show the layer order and identify signal, power and reference-plane assignments. Keep layer names consistent across the stackup drawing and fabrication files.
Dielectrics & Finished Thickness
Include the proposed core and prepreg construction, dielectric requirements and finished board thickness. Identify mechanical thickness limits that must be maintained.
Materials, Copper & Impedance
State material grades, copper requirements and impedance targets with their applicable layers or nets. Specify which construction details may be considered for adjustment.
Holes & Layer Connections
Define the required connections between layers and distinguish drill sizes from finished-hole requirements. Include a via map for blind, buried or other special structures.
Review any proposed material, thickness or stackup changes before approval. Keep the accepted construction aligned with the final fabrication revision.
Define the Requirements Layer by Layer
Materials, Copper & Impedance Requirements
Connect the material specification with the layer construction and electrical targets. Identify which requirements are mandatory and which alternatives may be considered during manufacturing review.
01 / Material Selection
Specify the Required Laminate
Provide the material designation and any required properties instead of leaving the specification at a general material family. State whether an alternative grade may be proposed for approval.
- Laminate manufacturer and grade, where specified
- Core and prepreg construction requirements
- High-Tg, halogen-free or other required properties
- Restrictions on substitutions or mixed-material builds
02 / Copper Construction
Separate Base & Finished Copper
Identify the copper requirement for each relevant layer and clearly state the reference being used. Review trace and spacing requirements alongside the proposed copper construction.
- Inner-layer and outer-layer copper requirements
- Base copper or finished copper designation
- Minimum trace width and spacing by layer
- Special copper or local construction requirements
03 / Electrical Targets
Define Controlled Impedance
Specify the required impedance values and tolerances with the proposed stackup. Identify the layers or nets to which the requirements apply and any requested verification records.
- Single-ended or differential target values
- Required tolerances and applicable layers or nets
- Proposed reference-layer arrangement
- Testing and reporting requirements
From Submitted Data to Agreed Acceptance Criteria
Engineering Review & Prototype Verification
Align the fabrication files, proposed stackup and acceptance requirements before the sample build. Identify critical features and the verification records required for your engineering evaluation.
Define What Must Be Manufactured & Checked
A Prototype Needs a Clear Manufacturing Specification
State the approved construction and flag any requirements that must not be changed without confirmation. Resolve discrepancies between drawings, files and written notes before release.
Manufacturing review and agreed board-level verification support the prototype build. Your team's circuit, system and application evaluation remains a separate activity.
File & Stackup Consistency
Check revision identification, layer naming, material specifications and board construction. Highlight conflicts or unresolved details that need clarification before approval.
Pre-Production EngineeringFabrication Limits & Special Features
Review trace spacing, drilling, hole connections, dimensions and other critical requirements against the proposed materials, copper thickness and process combination.
Prototype Fabrication CapabilitiesBoard-Level Verification & Records
Define electrical test requirements, critical dimensional checks and impedance verification where specified. Include requested inspection records and customer-specific acceptance criteria.
PCB Testing & InspectionHave a Critical Feature or Special Acceptance Requirement?
Include the relevant drawing, target value and required documentation with your request. Agree on the review and verification scope before the prototype is released for fabrication.
Confirm the applicable verification methods and delivery records with the order. Additional reliability evaluation, circuit functionality testing and product qualification are not implied by prototype fabrication alone.
Align the Build with Your Development Schedule
Standard & Quick-Turn Prototype Planning
Submit the complete construction and required date so a feasible fabrication schedule can be reviewed. Compare timing and pricing against the same approved materials, stackup and acceptance requirements.
What to Include When Discussing Price & Timing
- Quantity, Dimensions & Delivery Format State the board quantity, finished dimensions and whether individual boards or panels are required.
- Layer Construction & Materials Provide the stackup, laminate requirements, copper specifications and permitted alternatives.
- Special Processes & Acceptance Identify special holes, filling, finishes, impedance requirements and requested records.
- Revision Status & Required Date Submit matching files and drawings, identify unresolved items and clearly define the deadline.
Need a quotation for a specific development milestone? Send the files and requirements together so the proposed construction, price and schedule can be reviewed as one package.
Request Pricing & Lead TimeConfirm fabrication timing and transit arrangements separately. Any proposed material or specification changes require approval before they are incorporated into the order.
Keep the Next Manufacturing Stage Clearly Defined
Revisions, Pilot Runs & Specialized Structures
Maintain a clear fabrication baseline as your project moves through evaluation and revision. Confirm what changes, what remains approved and what is required for the next order.
Initial Prototype Build
Submit the proposed construction and identify the samples your team needs for evaluation. Confirm the fabrication specification and requested verification records before release.
Establish: the starting revision, approved stackup, materials and acceptance requirements.
Revised Prototype Build
Identify changes made after evaluation and update the files, stackup and written specifications together. State whether previous material or process approvals remain applicable.
Control: revision identification, changed features and retained requirements.
Pilot & Repeat Orders
Confirm the approved revision, intended quantity and delivery format. Review any prototype-specific conditions before moving to low-volume PCB fabrication .
Confirm: production suitability, panel requirements, acceptance criteria and documentation.
Moving to a pilot run does not automatically require a redesign. It requires confirmation that the approved construction and process conditions remain suitable for the intended order.
Does Your Project Need a Specialized Construction?
Use the relevant service overview for additional structure-specific requirements rather than applying one general multilayer capability range to every board type.
HDI & Microvia Structures For build-up layers, stacked or staggered microvias and advanced interconnect requirements.
Explore HDI Prototype ServicesRigid-Flex Constructions For designs combining rigid regions and flexible interconnects with defined mechanical requirements.
Explore Rigid-Flex PrototypesBroader Multilayer Manufacturing For the overall multilayer fabrication service beyond the current prototype request.
View Multilayer PCB Manufacturing
Prepare the Manufacturing Package
Files Required for a Multilayer Prototype Quote
Submit the fabrication data, proposed stackup and order requirements together. Clearly identify unresolved items and specifications that must remain unchanged.
Files, Drawings & Revision
- Gerber files and matching drill data
- Board outline and fabrication drawing
- Layer identification and proposed stackup
- Part number, revision and changes from previous builds
Materials & Electrical Requirements
- Laminate grades and permitted alternatives
- Finished board thickness and copper requirements
- Impedance targets, tolerances and applicable layers or nets
- Surface finish and special hole or filling requirements
Quantity, Acceptance & Delivery
- Required quantity and individual-board or panel delivery
- Critical dimensions and special tolerances
- Acceptance criteria and requested verification records
- Required ship date or arrival date
From File Submission to Fabrication Approval
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Step 01 / Submit
Send the Project Package
Provide consistent files and written requirements. Identify the proposed construction and any details that need manufacturing review.
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Step 02 / Confirm
Review Specifications & Quote
Resolve open questions and confirm the proposed construction, price and schedule. Approve any alternatives before they are incorporated.
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Step 03 / Approve
Release the Final Revision
Confirm the accepted fabrication package, order details and delivery arrangements before production release.
Keep the files, drawings and written requirements aligned to the same revision. Clearly identify any changes submitted after quotation or approval.
Before You Request a Sample Build
Multilayer PCB Prototype FAQ
Answers about stackup preparation, fabrication requirements, scheduling and the next manufacturing stage.
What information is needed to review a multilayer prototype?
Provide fabrication and drill data with the proposed stackup, material grades, copper requirements, finished thickness and quantity. Add impedance, finish, special tolerances and requested records where applicable. Use the quotation file checklist to prepare a consistent package.
Can I submit a proposed stackup for review?
Yes. Mark the stackup as proposed and identify fixed requirements and open construction details. Include layer assignments, materials, thicknesses and electrical targets. Manufacturing review does not automatically include circuit design or complete PCB layout services.
What materials and copper requirements should I specify?
Identify the required laminate grade and any permitted alternatives. State copper requirements by layer and distinguish base copper from finished copper. Review these specifications with the required trace spacing, board thickness and proposed construction.
How should controlled impedance be defined?
Specify single-ended or differential target values, tolerances and the applicable layers or nets. Include the proposed reference-layer arrangement and requested verification records. See the material, copper and impedance requirements when preparing your specifications.
Can you review HDI or other specialized constructions?
Yes. Identify the special construction and submit the corresponding stackup and via definitions. Use our HDI prototype or rigid-flex prototype information for structure-specific preparation. General multilayer limits should not be assumed to apply to every specialized board type.
What affects prototype pricing and lead time?
Quantity, dimensions, stackup, materials, copper, special processes and acceptance requirements define the quoted scope. File readiness and the required date also need consideration. Review the standard and quick-turn planning information before submitting the target schedule.
Can a prototype order move into pilot production?
Yes. Confirm the approved revision, intended quantity and any changes following evaluation. Recheck prototype-specific conditions, delivery format and acceptance requirements for the next order. Explore low-volume PCB fabrication for pilot and repeat small-batch requirements.
Bring Your Construction into Review
Ready to Quote Your Multilayer PCB Prototype?
Send your fabrication files, proposed stackup and board specifications with the required quantity and target date. Highlight critical features and acceptance requirements for a project-specific quotation.
Final construction, approved specifications, pricing and delivery arrangements are confirmed for the proposed order.