PCB Manufacturing FAQs | PCB & PCBA Questions

PCB Quotes & Pricing

What information do I need to get a PCB quote?

For a PCB fabrication quote, send your Gerber files, board quantity, board size, layer count, material, copper thickness, surface finish, and any special requirements.

If you need PCB assembly, also provide your BOM, pick-and-place file, assembly drawings, and testing requirements.

The more complete the project information is, the more accurate the quotation can be.

How much does PCB manufacturing cost?

PCB cost depends on several factors, including board size, layer count, material, quantity, copper thickness, surface finish, minimum trace and space, via structure, and other special processes.

For example, a 2-layer prototype and a high-layer-count HDI PCB can have very different manufacturing costs even when the board size is similar.

For an accurate price, send the Gerber files and production requirements for review.

Why did my PCB quote change after engineering review?

A preliminary quotation may change if engineering review finds requirements that were not included in the original RFQ.

Common examples include:

Different PCB materials
Higher copper thickness
More complex via structures
Impedance control
Special surface finishes
Tighter trace and space requirements
Additional testing
Special fabrication processes

When a requirement changes the manufacturing process or material cost, the quotation may need to be updated before production.

Does PCB quantity affect the unit price?

Yes. PCB quantity can have a major effect on unit cost.

Some manufacturing costs are fixed for a production run, such as tooling, setup, engineering, and production preparation. These costs are spread across the total quantity.

For this reason, the unit price is often lower when the production quantity increases.

Does SLLPCB have a minimum order quantity?

SLLPCB supports prototype, small-batch, and production PCB orders. There is no fixed MOQ requirement for every PCB project.

The suitable order quantity depends on the project, manufacturing requirements, and production plan.

If you only need a small number of prototype boards, you can provide the quantity with your Gerber files for quotation.

Can I get a quote for a PCB prototype?

Yes. SLLPCB supports PCB prototyping before larger production runs.

A prototype order allows you to verify the board design, manufacturing quality, assembly process, and functional performance before moving to larger quantities.

PCB Files & Engineering

What files do I need to send for PCB manufacturing?

For standard PCB fabrication, the main files usually include:

Gerber files
NC drill files
Board drawing
Layer information
Material requirements
Copper thickness
Surface finish
Special manufacturing requirements

For controlled impedance or advanced designs, also provide the required impedance values, stackup information, or other electrical requirements.

For PCB assembly, provide the BOM, pick-and-place file, assembly drawings, and testing requirements.

Can SLLPCB review my PCB design before production?

Yes. SLLPCB provides engineering support and DFM review before production.

Our engineers can review manufacturing requirements and identify potential problems related to board structure, trace and space, vias, materials, stackup, and other production requirements.

A DFM review can help identify problems before they become production issues.

What happens if my Gerber files have a manufacturing problem?

The engineering team reviews the manufacturing files before production.

If a problem is found, the team can explain the issue, describe its potential impact, and discuss a suitable correction with the customer.

Production should only proceed after the final manufacturing data and requirements are confirmed.

Can SLLPCB review my PCB stackup?

Yes. Stackup review can be part of the engineering review for multilayer, HDI, high-frequency, and high-speed PCB projects.

The review can consider layer count, dielectric materials, copper thickness, controlled impedance requirements, and the overall manufacturing structure.

For complex projects, providing the required impedance values and electrical requirements at the RFQ stage helps the engineering team evaluate the design more accurately.

Can SLLPCB support controlled impedance PCB projects?

Yes. Controlled impedance requirements can be reviewed during the engineering and manufacturing process.

Provide the required impedance values and relevant design information with the PCB files so the manufacturing structure can be evaluated before production.

For high-frequency and high-speed designs, material selection and stackup structure can also affect signal performance.

PCB Manufacturing

What types of PCBs can SLLPCB manufacture?

SLLPCB supports a wide range of PCB technologies, including:

Multilayer PCB
HDI PCB
Flexible PCB
Rigid-Flex PCB
High-Frequency PCB
Heavy Copper PCB
Metal Core PCB
Ceramic PCB
Aluminum PCB
IC Substrate
LED PCB

The suitable manufacturing process depends on the electrical, mechanical, thermal, and production requirements of the project.

What is the maximum number of PCB layers SLLPCB can manufacture?

SLLPCB supports PCB manufacturing from 1 to 68 layers.

The practical layer count for a specific project depends on board structure, material, thickness, aspect ratio, impedance requirements, and other manufacturing conditions.

For high-layer-count projects, providing the complete design files allows engineering to review production feasibility.

Can SLLPCB manufacture HDI PCBs?

Yes. SLLPCB supports HDI PCB manufacturing for high-density electronic designs.

HDI projects may use structures such as microvias, blind vias, buried vias, and sequential build-up depending on the design requirements.

For an HDI project, provide the layer structure, via requirements, stackup, and other manufacturing data for engineering review.

Can SLLPCB manufacture high-frequency PCBs?

Yes. SLLPCB supports high-frequency PCB manufacturing using suitable high-frequency and low-loss materials.

Material selection is important for RF and high-speed designs because dielectric properties, loss characteristics, copper surface, and stackup can affect signal performance.

Customers can provide their required material and electrical specifications for review.

What PCB surface finishes does SLLPCB offer?

SLLPCB supports commonly used PCB surface finishes based on the project requirements.

Typical options include:

HASL
Lead-Free HASL
ENIG
OSP
Immersion Silver
Immersion Tin
Gold-related finishes for specific applications

The appropriate finish depends on solderability, surface flatness, cost, shelf life, contact requirements, and assembly process.

If you have a specific surface-finish requirement, include it in the RFQ.

PCB Assembly & PCBA

Does SLLPCB provide turnkey PCB assembly?

Yes. SLLPCB provides turnkey PCB assembly from component sourcing to assembled boards.

The turnkey PCBA workflow can include:

PCB fabrication → component sourcing → SMT/THT assembly → inspection → testing → final delivery

This allows customers to manage PCB fabrication and assembly through one production workflow.

What files are needed for a PCBA quote?

For an accurate PCBA quotation, provide:

PCB Gerber files
BOM
Pick-and-place file
Assembly drawings
PCB quantity
Assembly quantity
Component requirements
Testing requirements

If there are special assembly instructions, include them with the RFQ.

Does SLLPCB support SMT and THT assembly?

Yes. SLLPCB supports SMT, THT, and mixed-technology PCB assembly.

The assembly method depends on the component package, board design, production requirements, and customer specifications.

Can SLLPCB source electronic components?

Yes. Component sourcing can be included in turnkey PCB assembly projects.

The BOM is reviewed for part numbers, quantities, availability, and other purchasing requirements before components are ordered.

For critical components, customers should provide approved part numbers or acceptable alternatives.

What happens if a component in my BOM is out of stock?

If a required component is unavailable, the sourcing team can check availability and identify possible alternatives.

An alternative component should not be substituted without customer approval when the change may affect electrical, mechanical, regulatory, or functional requirements.

For long-lead-time or obsolete components, it is better to identify the issue before production starts.

PCB Lead Time & Production

How long does PCB manufacturing take?

PCB lead time depends on the board technology, material, layer count, quantity, surface finish, special processes, and production requirements.

Simple prototype PCBs can have a much shorter lead time than complex HDI, high-frequency, or high-layer-count boards.

The actual lead time should be confirmed after engineering review and quotation.

How long does PCB assembly take?

PCBA lead time depends on the PCB fabrication schedule, component availability, assembly complexity, quantity, testing requirements, and production schedule.

Component shortages can also affect the final assembly date.

For turnkey PCBA projects, providing a complete BOM early can help the team identify supply risks before production.

Can SLLPCB support urgent PCB prototypes?

SLLPCB supports PCB prototype projects and provides rapid quotation support.

Urgent production depends on the board technology, material availability, manufacturing requirements, production capacity, and required delivery date.

If a project has a critical deadline, include the required delivery date in the RFQ so the production schedule can be evaluated before the order is confirmed.

What can delay a PCB or PCBA project?

Common causes include:

Incomplete Gerber files
Missing manufacturing information
Design changes
Unclear stackup requirements
Special material shortages
Component shortages
Long-lead-time components
Additional testing requirements
Engineering changes after production starts
Shipping or customs issues

Providing complete technical and delivery information at the beginning can reduce avoidable delays.

PCB Quality & Testing

How does SLLPCB check PCB quality?

Quality control can include inspection and testing at different stages of PCB and PCBA production.

Depending on the project, processes may include:

Incoming inspection
DFM review
SPI
AOI
X-ray inspection
Electrical testing
Functional testing
Final inspection

The required inspection and testing methods depend on the PCB or PCBA design and customer requirements.

Can I order prototypes before mass production?

Yes. Prototype production can be used to verify the PCB design and manufacturing quality before moving to larger production quantities.

Customers can inspect prototype boards and confirm the design and quality before proceeding with larger orders.

This approach can reduce production risk when a new PCB design is being introduced.

Can I receive samples for quality inspection?

Yes. Prototype or sample quantities can be arranged for project evaluation.

Customers can inspect the boards before moving to larger production quantities when the project requires additional validation.

For PCBA projects, sample builds can also be used to verify component placement, soldering, assembly quality, and functional performance.

What happens if I find a problem after receiving my PCB or PCBA?

Contact SLLPCB as soon as the problem is identified and provide the relevant order information, photos, test results, or other evidence.

The issue can then be evaluated to determine the root cause.

Depending on the cause and project requirements, the solution may include repair, rework, remake, or another corrective action.

Shipping & Delivery

How does SLLPCB ship PCB orders internationally?

SLLPCB can arrange different shipping methods depending on order size, destination, urgency, and customer requirements.

Common options include express shipping through DHL, UPS, or FedEx, as well as sea freight for larger shipments.

The shipping method should be selected based on the required delivery date and total shipment requirements.

Can SLLPCB arrange shipping for PCB and PCBA orders?

Yes. Shipping can be coordinated as part of the PCB or PCBA order.

Provide the destination and required delivery date so the suitable shipping method can be evaluated.

What information should I provide if my delivery date is critical?

Tell us the required delivery date when submitting the RFQ.

Also provide:

Destination
Required quantity
Prototype or production status
PCB technology
PCBA requirements
Testing requirements
Any fixed customer deadline

A clear delivery target allows production and shipping requirements to be considered before the order is confirmed.

Orders, Changes & Customer Support

Can I change my PCB files after placing an order?

It depends on the production stage.

If production has not started, updated files may be reviewed before manufacturing begins.

If production is already underway, a design change may require engineering review, production changes, or a new quotation.

Always contact the SLLPCB team before sending revised files after order confirmation.

What happens if my PCB design changes after production starts?

The impact depends on how far production has progressed.

The engineering team can review the new design and determine whether the change affects:

PCB fabrication
Materials
Tooling
Components
Assembly
Testing
Delivery schedule
Cost

Production should not be changed based on an unapproved design revision.

Can I send my own components for PCB assembly?

Customer-supplied components can be considered for suitable PCB assembly projects.

The component list, quantity, packaging, condition, and delivery schedule should be confirmed before assembly.

For turnkey projects, SLLPCB can also support component sourcing based on the approved BOM.

Can SLLPCB manufacture the PCB and assemble it at the same time?

Yes. SLLPCB provides both PCB fabrication and PCB assembly.

A turnkey project can combine:

PCB manufacturing + component sourcing + SMT/THT assembly + inspection + testing

This can reduce the need for customers to coordinate separate PCB and assembly suppliers.

Can SLLPCB support small prototype orders?

Yes. SLLPCB supports PCB prototype and small-batch projects as well as larger production orders.

Prototype production is useful for new designs, engineering validation, product development, and pre-production testing.

How does SLLPCB protect customer PCB files?

SLLPCB uses NDA agreements and controlled access to customer information.

Customer design files and project information should only be shared with the people and production resources that need them to complete the project.

For projects with specific confidentiality requirements, customers can discuss NDA and file-handling requirements before production.

PCB & PCBA FAQs