PCB Types / Custom Bare PCB Manufacturing
PCB Types for Different Design Requirements
Compare PCB types by layer count, mechanical structure, routing density, thermal needs and signal requirements. Understand how the categories work together, then find a manufacturing direction for your prototype or production project.
A PCB can belong to several categories. Define the construction from the project requirements, not a single label.
Understand the Categories Before Choosing
How Are PCB Types Classified?
PCB types describe different aspects of a board: conductive layers, mechanical structure, interconnect density, materials and functional requirements. Rigid, flexible, multilayer and HDI are not mutually exclusive choices. A complete construction can combine several of these descriptions.
Read each category by what it describes. Scroll horizontally on smaller screens.
| Dimension | Examples | What It Describes |
|---|---|---|
| Conductive Layers | Single-sided , double-sided and multilayer | The conductive-layer arrangement, not simply which side carries components. |
| Mechanical Structure | Rigid, flexible and rigid-flex | Whether the construction uses rigid regions, flexible regions or an integrated combination. |
| Interconnect & Routing | Conventional interconnects and HDI | The feature and interconnect approach needed to support the required routing density. |
| Material & Performance Direction | Metal-base constructions, RF and low-loss systems | Material choices connected to thermal, electrical and application requirements. |
| Conductor & Local Features | Heavy copper, controlled impedance, gold fingers and BGA layouts | Requirements that may apply across more than one board structure or material system. |
These are navigation dimensions, not a single universal taxonomy or a list of manufacturing capability limits. Confirm the actual construction for the project.
Use the manufacturing options below to explore the relevant construction. Detailed material and process requirements belong in the project-specific review.
Explore PCB Manufacturing OptionsFind the Relevant Manufacturing Path
Explore PCB Manufacturing Options
Use these entry points to explore board structures and manufacturing requirements in more detail. More than one option may apply to the same design.
Mechanical Structure
Rigid PCB
A non-flexing board structure for fixed installation. Evaluate a rigid construction when the circuit does not need a designed flexible region.
Define: layer arrangement, material, dimensions and mounting requirements.
Explore Rigid PCB Manufacturing
Conductive-Layer Arrangement
Multilayer PCB
Multiple conductive layers integrated into one board construction. Evaluate multilayer options when routing and reference-plane requirements extend beyond a two-layer design.
Define: stackup, copper, interconnects and any impedance requirements.
Explore Multilayer PCB Manufacturing
Interconnect & Routing Density
HDI PCB
An interconnect approach for dense routing and compact layouts. Evaluate HDI when package escape routing, feature size and available space require a more advanced construction.
Define: package pitch, via structure, build-up arrangement and critical features.
Explore HDI PCB Manufacturing
Flexible Circuit Construction
Flexible PCB
A circuit built with flexible material systems. Evaluate it for installation bends, compact interconnection or a specifically designed repeated-flexing requirement.
Define: bend conditions, copper, flexible-zone thickness and local support.
Explore Flexible PCB Manufacturing
Integrated Rigid & Flexible Regions
Rigid-Flex PCB
Rigid and flexible circuit regions combined in one integrated construction. Evaluate rigid-flex when the mechanical layout calls for this combination rather than separate boards and connections.
Define: rigid and flex regions, stackup, transitions and bend requirements.
Explore Rigid-Flex PCB Manufacturing
Metal-Base Thermal Construction
Metal Core PCB
A metal-base or metal-core construction evaluated for thermal and structural requirements. Compare the dielectric, circuit and base as a complete system.
Define: heat path, isolation, base material and cooling interface.
Explore Metal Core PCB Manufacturing
RF & Signal-Performance Requirements
High Frequency PCB
A board construction developed around RF or other demanding signal requirements. Material, copper, layer geometry and interconnects need coordinated evaluation.
Define: operating frequency, material, loss targets and impedance requirements.
Explore High Frequency PCB Manufacturing
Circuit Copper Requirements
Heavy Copper PCB
A construction with increased circuit copper thickness. Evaluate it where current paths and thermal requirements justify the copper specification and associated fabrication trade-offs.
Define: copper by layer, current paths, temperature limits and circuit geometry.
Explore Heavy Copper PCB ManufacturingStart with the Design Constraint
Choose by Your Design Requirements
Begin with what the board must achieve, then evaluate the structure and process needed to support it. The same project may follow more than one manufacturing direction.
A useful PCB selection identifies both a candidate construction and the information needed to assess it. Use the matrix below to narrow the discussion, not to replace a project-specific engineering review.
Match your main requirement, then check the details to provide. Scroll horizontally on smaller screens.
| Main Requirement | Direction to Evaluate | Information to Provide | Manufacturing Entry |
|---|---|---|---|
| Relatively Simple Routing & Cost Constraints | Single-Sided / Double-Sided Compare whether the circuit can be routed with the required connections and reference arrangement on one or two conductive layers. | Board outline, circuit layout, connections, electrical requirements, quantity and any fixed material or mechanical constraints. |
Single-Sided PCB
Double-Sided PCB |
| More Routing Space & Reference Planes | Multilayer Construction Evaluate a stackup that supports the routing, power distribution and reference-layer needs of the design. | Proposed layer count, signal and plane arrangement, finished thickness, copper, interconnects and impedance requirements. | Multilayer PCB |
| Dense Interconnects & Limited Board Space | HDI Where the Layout Requires It Compare the required escape routing and interconnect structure. A package name alone does not establish the need for HDI. | Package pitch, pad layout, available routing space, critical line and space requirements, via structure and proposed build-up. | HDI PCB |
| Installation Bending or Repeated Flexing | Flexible Circuit Construction Evaluate a flex structure designed for the actual mechanical use. Installation bending and repeated movement are different requirements. | Bend regions, bend geometry, expected movement, flexible-zone thickness, copper arrangement, stiffeners and operating environment. | Flexible PCB |
| Integrated Rigid Regions & Flexible Connections | Rigid-Flex Construction Evaluate the integrated rigid and flexible regions against the intended mechanical layout and connection requirements. | Rigid and flex outlines, region-specific stackup, transition locations, installation geometry and required bend conditions. | Rigid-Flex PCB |
| Higher Current in Defined Circuit Paths | Copper Geometry / Heavy Copper Evaluate circuit copper thickness and geometry against the current paths, temperature limits and fabrication requirements. | Current by path, operating conditions, allowable temperature rise, copper by layer, trace geometry and connection requirements. | Heavy Copper PCB |
| Heat Transfer to a Base or Cooling Interface | Metal-Base & Other Thermal Constructions Compare the complete heat path, including dielectric isolation, circuit geometry, base and external cooling interface. | Heat-source locations, power dissipation, temperature targets, isolation requirements, mounting and cooling conditions. | Metal Core PCB |
| Demanding RF or Signal Performance | Material, Stackup & Impedance Review Evaluate the dielectric, copper, reference structure and interconnects together. RF and high-speed digital requirements are not identical selection tasks. | Relevant frequencies or signal characteristics, loss and impedance targets, reference layers, material restrictions and verification requirements. | High Frequency PCB |
These are evaluation paths, not guaranteed recommendations or capability limits. Multiple requirements may apply to one board. Confirm the final construction against the project specifications.
You Do Not Need Every Label Finalized to Begin
Share the design information already available. A clear distinction between fixed requirements and open choices is more useful than selecting a type without the supporting details.
- Identify What Is Fixed
- Include approved materials, board dimensions, electrical requirements, mechanical constraints and any mandatory construction details.
- Mark What Can Be Evaluated
- Identify open layer counts, proposed alternatives and other construction choices that may be reviewed without changing approved requirements.
- Send Files for the Relevant Review
- Provide available layouts, stackups and drawings. Use the project-review section to prepare the fabrication inquiry.
Some requirements apply across board types. Review BGA layouts, controlled impedance, gold fingers and high-Tg material needs as additional parts of the construction.
Explore Feature-Specific RequirementsRequirements That Cross Board Categories
Feature-Specific PCB Requirements
Package layouts, controlled electrical properties, contact features and material specifications add requirements to the board construction. They do not replace its structural definition.
A multilayer rigid board can include BGA layouts, controlled impedance, gold fingers and a specified high-Tg laminate. Review each requirement where it applies, then combine the agreed details in the fabrication definition.
Package Layout & Escape Routing
BGA PCB
A board designed around ball-grid-array package connections. Pad geometry and escape routing determine the relevant fabrication needs; a BGA layout does not automatically require HDI.
Define: package pitch, pad layout, routing, via structure and any filling or capping requirements.
Explore BGA PCB Manufacturing
Electrical Performance Specification
Impedance Control PCB
A construction with specified transmission-line impedance requirements. Material, dielectric geometry, copper and reference layers must be defined together for the relevant signals.
Define: target impedance, tolerance, signal layers, reference structure and verification requirements.
Explore Impedance Control
Edge Contacts & Local Finish
Gold Fingers PCB
A board with specified edge-connector contacts. Define the contact geometry, plating system and mechanical interface rather than treating every gold-colored finish as equivalent.
Define: contact drawing, plating requirements, local finish areas and any bevel details.
Explore Gold Fingers Manufacturing
Material & Thermal-Reliability Requirements
High Tg PCB
A board fabricated with a specified high-Tg laminate. Review Tg with the other relevant thermal, expansion and reliability properties—not as a complete temperature rating.
Define: approved grade or thermal targets, stackup, processing exposure and substitution restrictions.
Explore High-Tg PCB ManufacturingConnect these feature requirements with the material system and manufacturing capability needed for the complete board construction.
Review Materials & CapabilitiesConnect the Selection to Fabrication
Connect PCB Type, Material & Manufacturing Capability
A board category identifies a direction. The material system, feature requirements and manufacturing definition determine how that direction becomes a specific PCB construction.
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Material Selection
Compare the Material System
Explore PCB MaterialsConnect electrical, thermal, mechanical and environmental requirements with a suitable material direction. Keep an approved grade or specification visible when one exists.
Review the specific grade and construction, not the material name alone.
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Manufacturing Capability
Check the Required Features
Review PCB CapabilitiesReview the published capability information against the proposed stackup, copper, holes, circuit features and finished-board requirements. Identify critical combinations for project-specific confirmation.
Do not assume separately listed options can all be combined in one construction.
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Project Documentation
Prepare the Fabrication Inputs
Prepare Manufacturing FilesBring together the available fabrication files, stackup, drawings and specifications. Distinguish approved requirements from choices that remain open for review.
Use consistent revisions and identify missing information explicitly.
Ready to discuss a defined construction—or still comparing possible directions? Share what is fixed and what needs further review.
Prepare Your Project InquiryFrom PCB Selection to Project Review
Discuss Your PCB Requirements
Have a defined construction or a design question to resolve? Share the available requirements for a custom bare PCB fabrication inquiry. You do not need every category label finalized.
Include What Is Already Known
Provide the relevant details below. Keep approved requirements distinct from options that may be evaluated or proposed for review.
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Board Structure or Selection Question
State the intended construction, or describe the design constraint that still needs clarification.
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Layer Arrangement & Stackup
Include the proposed layer count, finished thickness and region-specific construction where applicable.
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Critical Electrical & Mechanical Requirements
Identify relevant impedance, interconnect, current, thermal, bending or mounting requirements.
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Materials, Copper & Special Features
List approved grades, copper requirements, finishes, contact features and substitution restrictions.
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Quantity & Delivery Priorities
Specify the prototype, pilot-run or production quantity and the requested delivery timing.
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Fabrication Files & Supporting Documents
Attach the available fabrication data, drawings, stackup and applicable specifications to your email.
Send Your Project for Fabrication Review
Prepare an email to sales@pcbelec.com with your requirements and available project files. Review the message and attach documents before sending.
Opens your email application. Nothing is sent automatically.
This section does not upload files. If your email application does not open, copy sales@pcbelec.com into your preferred email service. Refer to the manufacturing file requirements when preparing attachments. Use an appropriate secure transfer method for confidential files.
PCB Classification & Selection Questions
Frequently Asked Questions About PCB Types
These answers clarify how board categories relate to construction and manufacturing requirements. Use them to frame the project discussion, not as a substitute for the fabrication specification.
Can one PCB belong to more than one category?
Yes. PCB categories describe different aspects of a construction. A board can be rigid and multilayer, use HDI interconnects and include controlled impedance. These descriptions work together; they are not mutually exclusive product choices.
How are single-sided, double-sided and multilayer PCBs distinguished?
The distinction concerns the conductive-layer arrangement. A single-sided board has one conductive circuit layer; a double-sided board has conductive layers on both sides. Multilayer constructions add internal conductive layers. Component placement on one or both surfaces does not define this classification.
Is an HDI PCB simply a board with more layers?
No. HDI concerns the interconnect and feature approach used to support dense routing. A higher layer count alone does not define HDI. Review the required routing features, via structure and build-up arrangement with the stackup.
Explore HDI PCB manufacturing for the relevant construction requirements.
Does a BGA layout always require HDI?
No. The required construction depends on package pitch, pad geometry, escape routing, available space and interconnects. Some BGA layouts can use conventional constructions; others require finer features or HDI approaches. Assess the actual layout, not the package name alone.
What is the difference between heavy copper and metal core PCBs?
Heavy copper describes increased circuit copper thickness. Metal core or metal-base describes a construction containing a metal core or base. They address different parts of the board definition and are not interchangeable labels. Compare current paths and the complete thermal construction.
Is every flexible PCB suitable for repeated bending?
No. A circuit designed for installation bending is not automatically suitable for repeated flexing. Define the movement, bend geometry, flexible-zone construction and operating conditions. Copper, materials and local support need to suit the intended mechanical use.
Does every high-speed design need a specialized high-frequency laminate?
Not automatically. Material selection follows the signal requirements, loss budget, transmission paths and required construction. High-speed digital and RF designs are not identical selection tasks. Evaluate the material grade, stackup, copper and interconnects together rather than selecting by a broad label.
Can I request a review before deciding the final PCB type?
Yes. Share the available layout, board dimensions, electrical and mechanical requirements, quantity and delivery priorities. Identify what is already approved and what remains open. A final category label is not required to explain the project.
Use the project-review checklist to prepare your fabrication inquiry.
Have a requirement that combines several categories? Include the relevant stackup, drawing or specification with your inquiry.
Prepare Your Project InquiryRelated Planning Resources
Continue Your PCB Planning
Explore the next level of detail when you need to define layers, compare materials or prepare fabrication documents.
Stackup Planning
Multilayer Stackup & Thickness
Read about copper layers, insulating materials, reference arrangements and the relationship between stackup and finished thickness.
Read the Stackup GuideMaterial Selection
PCB Material Options
Compare material directions against electrical, thermal and mechanical requirements, then explore the relevant material guide.
Explore PCB MaterialsFabrication Preparation
Manufacturing File Requirements
Prepare the available fabrication data, drawings, stackup and supporting specifications for a clear project inquiry.
Review File Requirements