Both rigid and flexible printed circuit boards (PCBS) are used to connect electronic components in a variety of consumer and non-consumer devices. As the name suggests, a rigid PCB is a circuit board built on a rigid base layer that cannot be bent, while a flexible PCB (also known as a flexible circuit) is built on a flexible base that can bend, twist, and fold.

Although both traditional and flexible PCBS serve the same basic purpose, it is important to note that there are many differences between them. Flexible circuits are not just bent PCBS; they are manufactured differently from rigid PCBS and have various performance advantages and disadvantages. Learn more about rigid and flexible PCBS below.

What is the difference between a rigid PCB and a flexible circuit?

Rigid PCBS, often referred to simply as PCBS, are what most people think of when they think of circuit boards. These plates connect electrical components using conductive rails and other components arranged on a non-conductive substrate. On rigid circuit boards, the non-conductive substrate usually contains glass that enhances the strength of the board and gives it strength and stiffness. The rigid circuit board provides good support for the assembly and provides good thermal resistance.

This type of circuit board uses a flexible substrate, such as polyimide, although flexible PCBS also have conductive traces on a non-conductive substrate. The flexible base allows flexible circuits to withstand vibrations, dissipate heat and fold into various shapes. Because of its structural advantages, flexible circuits are increasingly used in compact and innovative electronic products.

In addition to the material and rigidity of the base layer, the significant differences between a PCB and a flexible circuit include:

Conductive material: Because flexible circuits must be bent, manufacturers may use a softer rolled annealed copper instead of conductive copper.

L Manufacturing process: Flexible PCB manufacturers do not use solder blocking films, but instead use a process called overlay, or overlay, to protect the exposed circuit of a flexible PCB.

Typical costs: Flexible circuits typically cost more than rigid boards. But because flexible boards can be installed in tight Spaces, engineers can reduce the size of their products, thereby indirectly saving money.

How to choose between rigid and flexible PCB

Rigid and flexible boards can be used in many different products, although some applications may benefit more from one type of board. For example, rigid PCBS make sense in larger products (such as TVs and desktop computers), while more compact products (such as smartphones and wearable technology) require flexible circuits.

When choosing between a rigid PCB and a flexible PCB, consider your application requirements, the industry’s preferred board type, and the effect of using one type or the other that may be profitable.