KKPCB’s rigid PCB solutions allow you to build cost-effective boards that can perform in harsh conditions. As a time-tested standard for circuit boards, rigid PCBs maintain their shape and prevent deformation in a wide range of applications.

Rigid PCBs are inherently versatile and are suitable for a variety of configurations from single to multi-layer. With KKPCB’s design for manufacturability and engineering services, you can find a rigid PCB that matches your size, material, and build specifications.

Specs and Tolerances

Outer Layer Trace / Space	.002″ / .002″
Inner Layer Trace / Space	.002′ / .002′
Minimum Drilled Hole	.002″
Standard Drilled Hole	.008″
Drill Aspect Ratio	35:1
Minimum Pad Size	.004″
Minimum Feature to Edge	.010″
Minimum Core Thickness	.001″
Controlled Depth Drilling	YES
Sequential Lamination	YES

Rigid PCB types
One of the advantages of rigid PCBs is their ability to be used in a wide range of project specifications and configurations. At MCL, we offer several types of rigid PCBs, including:

Single-sided: Single-sided boards are the original PCBs. They feature a single layer of conductive material with all components on one side of the board. Single-sided PCBs are simple to design, fast and easy to manufacture, and reduce the possibility of error. This cost-effective configuration is popular in low-density designs.
Double-Sided: Instead of a single conductive layer, double-sided PCBs use copper conductive layers on both sides. Double-sided PCBs have double the space for components, more design options, and higher circuit complexity, making them suitable for a variety of projects.
Multi-layer: This type of PCB uses three or more layers of conductive material stacked in the middle, with the other layers surrounding the core. With numerous layer counts and advanced curing processes, multi-layer boards reduce the need for interconnect routing, save space, and create a dense and rigid PCB.
Carrier or Mechanical Spacer: When you need a rigid backplane to provide support during the assembly of an extremely thin PCB, some companies may choose to use a carrier board without a conductive layer. Any circuit board used for mechanical operations has a copper layer or requires any electrical connections. At MCL, we can create bare rigid PCBs to your exact specifications to support all the components and devices you intend to use.
Material Considerations
The materials in a rigid PCB depend on the project specifications. With a wide range of materials, you can design a rigid PCB that is suitable for your application.

Conductors
At MCL, we supply PCBs with specialized metal cores, such as aluminum, to achieve high thermal conductivity while remaining cost-effective. The metal core we use depends on your specifications and thermal conductivity needs.

Adhesives
The adhesive will vary based on project specifications and conductor thickness. Some options include:

Epoxy.

Prepreg.

Acrylic Fiber.

Insulators
We will provide insulators with strong signal transmission and safety. Possible materials include:

Coverlay, Covercoat, and Solder Mask.

Standard FR-4 Materials.

Lead-free Compatible FR-4 Materials.
As the most common type of rigid PCB, FR-4 boards feature a flame-retardant fiberglass layer for increased rigidity and flame retardancy. These boards are lightweight and resistant to high temperatures and moisture, making them an excellent choice for many applications.

When PCBs need to operate at high temperatures, high Tg boards have a glass transition temperature (Tg) of over 150 degrees Celsius. If you are working with a high-power circuit density design, the heat generated may overwhelm the thermal management methods of standard PCBs. In these cases, high Tg boards are a practical solution.

Finishes
Your rigid PCB will use copper layers for efficient current flow and will need protection from corrosion and oxidation. Possible protective coatings include:

Electroless nickel gold (ENIG).

Electroless nickel electroless palladium immersion gold (ENEPIG).

Immersion tin.

Hot air solder leveling (HASL).

Immersion silver.

Lead-free tin spray.

Electrolytic gold for wire bonding.

Hard gold fingers.

KKPCB conducts research on special processing technologies such as ordinary double-sided boards, thick copper circuit boards, high-frequency circuit boards, HDI circuit boards, rigid-flexible circuit boards, FPC flexible boards, buried blind hole circuit boards, and IC carrier boards. Provides PCB design, PCB layout, PCB prototyping and PCB assembly services.