A completed Guide of Double-sided Flexible PCB

• Single-sided Flex PCB or Single-layer flex PCB, install the original on one side of the board, and there is a conductor pattern on the other. A single-layer flexible PCB has only one layer of conductive material. Single-layer flexible PCB has the advantages of lower cost, more easy design, production, mass production, and delivery time.
• Double-sided flexible PCB has more layers than single-layer flexible PCB but fewer than multi-layer flexible PCB; double-layer flexible PCB has a layer of conductive metal on both sides, which increases the wiring density per unit area and is more suitable for routing.

The circuits and components on both sides of the double-sided flexible PCB can be electrically connected through through-hole mounting and surface mounting.

• Three or more double-sided flexible PCBs laminate into the multilayer flexible PCB. Each substrate layer in a multilayer PCB has conductive metal on both sides. These substrates are bonded with a unique adhesive, but an insulating material separates each substrate.

The electrical connection between each layer of the multilayer flexible PCB is achieved through holes, blind holes, or buried holes.

The advantages of multilayer flexible PCB are:

• More suitable for complex projects;
• Have higher quality and reliability;
• The density of multilayer flexible PCB circuits is increased, with higher operating capacity and operating speed, and overall product performance is improved;
• Improved durability. The more layers of the circuit board, the thicker its thickness, so it is more durable than single-sided flexible PCB or double-sided flexible PCB;
• Smaller size and lighter weight: Multilayer flexible PCB realizes a more compact circuit design, which can further compress the size and volume of the circuit board, thereby reducing weight.