PCB Design Services

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What Are PCB Design Services?

PCB design services consist of engineering, layout, and manufacturing outputs that transform circuit intent into board data for production. The specific services provided depend on the current project state; for example, a circuit that is still changing requires design engineering, whereas an approved schematic can directly enter PCB layout. Likewise, existing layouts may require DFM review and a manufacturing output package instead of redesign.

A PCB designer turns electrical intent into a board that can be inspected, fabricated, and assembled by another party. Problems and complexity increase when package density rises, controlled impedance is required, mechanical limits are present, or incomplete files create interdependencies between decisions.

Design Engineering

Design engineering works upstream of physical routing to resolve the functional operation of the circuit, identify the components to be used, provide schematic logic, power requirements, interface behavior, and the constraints of the layout. During this design phase, routing too early when the schematic or BOM is still moving can mask an unresolved decision behind board geometry and lead to further design problems in assembly.

An engineering request should state whether SUGA is completing an engineering review of an existing schematic, correcting circuit documentation, completing the BOM, or assessing SI and PI requirements. It should also identify the sign-off authority for the electrical requirements, which separates circuit responsibility from layout execution.

Layout Service

Layout services convert approved electrical requirements into PCB design by generating component placement, trace routing, layer planning, and manufacturing data from this conversion. The PCB layout team requires consistent connectivity, mechanical boundaries, trace routing guidelines, and package specifications. PCB layout services do not automatically include circuit redesign. The PCB quotation identifies what happens when the supplied schematic contains incompatibilities with constraints or package information.

Layout deliverables include source files in editable format, Gerber data, fabrication drawings, and assembly-facing outputs included in the order.

The buying decision follows the files, not the service label. Any incomplete circuit requirements must undergo an engineering review before being placed into placement and routing; only upon approval of the requirements may the project proceed to placement and routing without returning to circuit decisions.

DFM Review and Manufacturing Output

A DFM/DFA review or manufacturing output will allow the project team to present a comprehensive overview of the previous board layout and identify the necessary adjustments without requiring extensive redesign work to complete the project. The DFM/DFA review provides a list of issues or decisions that must be made before producing a manufacturing-output package. The detailed DFM/DFA criteria are included in the design review section below.

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PCB Design Inputs Before Quote

The only information available for quoting is that which is in the files: i.e., schematic status, BOM stability, connectivity, board outline, and design constraints. The design specifications provided allow SUGA to determine if the request is design engineering, PCB layout, review-only work, or manufacturing-output review. If any information is missing, the initial engineering task will be adjusted and, as a result, the pricing or schedule may need to be adjusted.

Minimum Files for Initial Quote

The minimum required files to begin quoting are the latest schematic or current PCB source/Gerber package, a BOM or component list, board outline, and requirement summary. If any of the documents are not available, it’s important to note what documents are missing. An older revision of the schematic should not be assumed without clarifying that it’s an older revision.

The initial package will provide answers to four questions: what items are already approved; what does SUGA need to design or review; what files does the customer expect; and what is the next production stage? This will provide enough information to proceed with the engineering review until further detailed constraints are submitted.

• The schematic or current board data establishes connectivity and design status.
• The BOM identifies package, sourcing assumptions, and assembly-sensitive parts.
• The board outline or DXF establishes usable area, mounting points, and interfaces.
• The requirement summary indicates the intended application, expected outputs, and known constraints.

Recommended Inputs for Layout Work

The recommendation is to confirm that the netlist, verified footprints and component Datasheets and mechanical data agree with the schematic and BOM before starting the layout. Placement considerations should also be made for: fixed connectors, keep-outs, height limitations, heat sources and critical component relationships. Routing needs to define controlled impedance nets, differential pairs, current paths, length rules and topology rules.

Extra Inputs for Complex Boards

High-speed and RF designs will include interface standard requirements, stack-up info, impedance values, reference layer plan requirements, and loss or validation requirements. Dense BGA and HDI designs require package drawings, ball maps, via preferences, escape assumptions and fabrication limits. Rigid-Flex PCB designs incorporate bend regions, flex stack-up, mechanical movement, and enclosure geometry.

Power, high-voltage and thermal PCB designs have additional information: current ratings, copper specifications, clearance specifications, heat and operational information. Changes to placement due to test access, connector behavior or limitations on how to assemble may reduce the placement area before routing commences. Providing all of these limitations upfront during the first review will prevent the quote for a complex PCB design from treating it as a regular PCB geometry.

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PCB Layout Capabilities

Just because a PCB has a particular number of layers or feature size does not mean it is ready for quoting. The only way to determine if any information is suitable for quoting is to read the information against the stack-up, package data, material, impedance target, drill strategy, and manufacturing conditions that make the information useful.

Layout figures, fabrication figures, and assembly figures are for different jobs. Be careful to separate the units and roles before making a comparison between suppliers.

High-Speed and Controlled-Impedance Layout

High-speed and controlled-impedance layout and design need to be analyzed according to the performance targets of a particular system. When implementing high-speed designs for 12 Gbps, 25 / 28 Gbps or 56 / 112 Gbps PAM4 channels, engineers must consider the topology, stack-up, material selection, signal return paths, length and attenuation performance characteristics, and build/test coupon methods that meet performance requirements, depending on the amount of control and consistency provided during the manufacturing process.

Controlled-impedance layout design must follow the same logic as high-speed designs. A controlled-impedance target of ±5% can only be achieved if the design defines the geometry, copper thickness, materials, and test procedures for controlled-impedance testing.

SUGA works closely with the manufacturing source to provide all routing criteria, evaluate the necessary laminate stack-up, and prepare fabrication data.

HDI and Fine-Pitch BGA Layout

Fine-pitch layout design converts the information obtained from the package analysis into a series of via and escape decisions based on package specifications. The quote includes any necessary details regarding whether 0.2 mm represents a ball-to-ball gap, whether 0.3 mm represents pitch, or whether 2,912 represents the ball or pin count associated with the package.

The ball map, package drawing, layer target, via structure and assembly clearances will all dictate routing requirements.

In addition, ELIC and any-layer HDI designs will require the intended build-up stack, via stack, laser-drill capabilities, and lamination cycle for production. SUGA will review all dependencies against manufacturing requirements to ensure that the choice of interconnects relates to a producible laminated stack, and not evaluate ELIC as a separate line item/price item.

Rigid-Flex and RF Design Support

Rigid-flex layouts are created around mechanical movement. Flex zones, bending radius, layer transitioning, stiffeners, keep-outs, and enclosure geometry determine placement and routing of components before a board is moved to the manufacturing stage. The material and stack build-up should accommodate these decisions.

When conducting RF work, the focus is on frequency, material, geometry, and return path. RF at 60 GHz is not the same as a serial data rate. Evaluating the design includes examining the transmission structure, grounding, transition points, and the test environment for the manufacturing package.

Design Tools and Mixed Technologies

The compatibility of software tools helps SUGA accurately receive, modify, analyze, and send the design back to you. Cadence Allegro, OrCAD Capture, PCB Designer, PADS, HyperLynx, Altium Designer, Eagle, and P-CAD files must be supplied with their native sources, libraries, and versioning. Converting from one tool to another may preserve some of the geometry but not the design constraints or library intent of the original file. As such, the quote for conversion should specify which deliverable will remain modifiable.

Mixed digital, analog, RF, and power boards require different rule groups and review process priorities.

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PCB Design Deliverables

The collection of PCB design documents used to complete the design may vary by use. Each uses a different document set, including: the design archive, fabrication documents, assembly documents, and customer document control process. The Gerber file set is not sufficient for all phases of the PCBA manufacturing process.

Layout Source and Manufacturing Files

The design archive consists of an editable PCB source file, the libraries used for the design, the constraints used for manufacturing, and any notes pertaining to these items if applicable to the project. Customer quotations specify whether an editable native file set will be provided to the customer or only a set of manufacturing files.

The manufacturing outputs are exports from the accepted design source. They will include a version identifier that matches the drawing and approval notes. If a manufacturing output changes after the drawing and approval process, the source version and the list of files will change as well.

Assembly and Stencil Files

The assembly data will consist of the BOM, pick-and-place file or centroid file, and polarity and orientation data, assembly drawing and any special assembly instructions. The BOM will match the component package used in the PCB layout. The pick-and-place or centroid file will provide an accurate record of the placement coordinates, the origin and rotation of the component package used in the released PCB layout. The assembly drawing identifies connector, polarity, and process notes, and provides guidelines for production.

Stencil data will be used if the downstream assembly or stencil process requires the use of a stencil for assembly. The stencil data may include framed-stencil structure and other parameters agreed upon for the assembly. The stencil data is not included as a generic stencil file unless the stencil company has determined what is required for a given assembly process and the component packages used.

Fabrication Drawings and Gerber Package

Fabrication needs the Gerber or another agreed-upon manufacturing data set; drill files, fabrication drawing, stack-up notes, and special instructions identifying items not explicitly defined via copper artwork. A fabrication drawing will document the dimensions, tolerances, material type, finish, drill file, and any other instructions which cannot be determined by viewing the copper artwork alone.

SUGA will ensure that the Gerber layers, drill data, and the fabrication drawing indicate the same version of the PCB before ordering fabrication. A mismatch between layer names or stale drill files could go undetected by a visual inspection, but could prevent the fabrication engineer from manufacturing the PCB.

Customer Drawing and Smart Manufacturing Outputs

Some customers may have requirements for formal drawings, whether in terms of formatting, naming conventions, etc. These requirements will be identified in the agreed-upon version number and approval documentation.

Gerber and drill files remain the most common outputs for fabrication. ODB++, IPC-2581, or Gerber X3 may be requested if a customer needs a more detailed representation of components, tooling, assembly or inspection data in an all-encompassing intelligent data set. These document types are quoted deliverables and are not automatic replacements for all current documents.

Version and Approval Notes

The final engineering document package will contain engineering questions, customer decision, a record of all documented file changes, and the status of final acceptance for the customer. For any open exceptions, there must be a visible action. This record will be used by the subsequent team to understand the risks that were resolved, accepted or excluded from the quoted work.

The document sets will be grouped according to their respective use:

• Design archive – editable source files, libraries, constraints and notes identified in the customer quotation
• Fabrication – the board data, drill files, fabrication drawings, stack-up notes, and version number
• Assembly – BOM, pick-and-place or centroid data, assembly drawings, polarity and process notes
• Customer drawing control – the agreed-upon format and approval identifier assigned to the customer
• Project record – engineering questions, decisions and final acceptance.

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PCB Design Cost and Lead Time Factors

Factors affecting the total PCB design cost and lead time include complexity of routing, completeness of the submitted information, the type of technology used on the PCB, the level/number of analyses performed on the PCB and the desired end format of the physical PCB and number of changes after the initial release. The number of layers cannot determine PCB quote costs since the same PCB may have a different complexity depending on the timing of completing the package data, mechanical constraints, impedance specifications, or the timing of any required approvals during the design process.

The terminal pin counts below are based on the terminal count defined in the capability table and must be confirmed by SUGA before establishing a delivery timetable. This is necessary for each schedule to correctly reflect the workload required by the routing activity.

The periods are meaningful only with their conditions; therefore, while a small terminal count may appear insignificant in nature, many other circuit applications exist behind a small terminal count (i.e. RF, rigid-flex, high voltage, mechanical work). For example, a larger board that uses established libraries, cleared constraints, etc., is generally easier to manage and plan than a smaller board for which its package and outline may change during routing.

Complexity Drivers

Routing needs will generally be based on pin counts; pin counts alone generally do not determine the areas of the board where the most routing activities will occur. Package escape rules and interfaces are usually important to determining where the majority of routing activity takes place. The use of fine-pitch BGA packages, HDI, rigid-flex, RF, high-power or mixed-technology boards generally add additional planning and checking processes. Using conversion tools, having an incomplete footprint library and producing formal drawings can create a significant amount of added workload, even for a board whose copper geometries are standard.

The quote illustrates how each complexity driver connects to an action. For example, when a board uses a dense BGA configuration, the designer may need to provide a fan-out plan and confirmation of the ability to manufacture the specified board. Similarly, a designer working with high-speed circuits may need to include stack-up, loss values or validation inputs before routing may continue. A board that uses a rigid-flex design may require mechanical and bend information; therefore, a designer must either include this information in the initial package or provide it in a note or separate documentation.

Lead Time Variables

Lead time begins to accumulate from the time an appropriate set of design inputs is ready for the work quoted above. If the schematic, BOM or board outline changes after the routing process has begun, then the estimated lead time must include time to re-plan the work, time to inspect any affected routing, and time to re-inspect after the work has been completed. A customer's response time also has a direct impact on the planning process, as lack of resolution on an open issue may prevent the completion of dependent tasks.

Examples such as 1 day, 24 hours, or 5 days, are generally used to identify the manufacture or turnkey phases of the quoted process. For example, 24-hour or 48-hour quotes may be used with fast review or quote turnaround times. Neither statement is a guarantee to complete the development, evaluation and release of a complex PCB within that timeframe.

Pricing Inputs

A PCB design quote may be offered as either an hourly or project-based price. An actual quote would depend on board technologies chosen, the amount of completeness of source files, the level of depth in engineering review, the types of final deliverables required, and who is in charge of processing and coordinating the fabrication or assembly of your PCB.

Procurement should ask what is included in the price: Electrical review, layout, library work, DFM/DFA, SI/PI, drawings, Intelligent Manufacturing Data, and Change Rounds can all be independent components of the overall PCB design quote.