Semi Flex PCB


ModelSemi Flex PCB
CertificationUL , ISO9001
Minimum Order Quantity1pcs
Packaging DetailsVacuum
Delivery TimeFastest 24 hours for prototype
Payment Terms T/T




A semi flex PCB is a board manufactured with a specific process. that mills a portion of rigid FR4 to a thickness of 0.20 mm +/- 0.10 mm. Additionally, the process makes the PCB flexible enough to fit inside an enclosure. This PCB is primarily intended for one-off flex mounts.

Semi-flex PCB is a flexible mounting board made entirely of FR4. The bending element of the board is a thin FR4 core. Additionally, FR4 cores have a limited number of bends. Therefore, for applications that require two boards to mounted. at an angle in one unit, this board is a suitable choice. Semi-flex boards made entirely of FR4. It is less expensive than complex polyimide rigid-flex circuits.

Users can design a Fr4 semi-flexible board that bends multiple times. Thus, this enables installation and maintenance as required. The most important benefit of this PCB is that it can fit into the available space. The manufacture of semi-flex PCBs involves removing material from a portion of the board.

The minimum bending radius of a single-layer semi-flex PCB is 5.0mm. Also, this is beyond the scope of polyimide flexibility. However, this is sufficient for most applications. The semi-flexible board can achieve a bending angle of 180°. In addition, the number of bending cycles is below 10.


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FR4 semi-flex PCB can change its shape according to space constraints. Additionally, this type of board bent without affecting signal transmission. In a Semi Flex PCB, a rigid section combined with a flexible section. The rigid section is typically used to mount components or provide structural support. while the flexible section allows the board to bend or flex to fit into tight spaces. or conform to curved surfaces. The flexible section often consists of one or more flexible layers. made of materials like polyimide (PI) or polyester (PET).

FR4 PCBs are rigid and lack flexibility, whereas Semi Flex PCBs combine the rigidity of materials. like FR4 with the flexibility of materials like polyimide or polyester. The choice between them depends on the specific requirements of the application. with FR4 PCBs suitable for rigid and non-flexible applications. and Semi Flex PCBs suitable for applications that require a balance of flexibility and rigidity.


The key technical difference between flex and semi-flex PCBs. That is that flex PCBs built on a flexible polymer film substrate. The circuit pattern built into the film with conductive material. and a thin coating added to protect the circuit. The film makes the entire board flexible, allowing it to bent and manipulated without damage.

In contrast, a semi-flex PCB can only bend in certain areas where it is already bent. Therefore, the PCB will only bend in a predetermined way and at defined points. The figure below illustrates the concept of a semi-flex PCB.


Space Savings

flexible pcb Space Efficiency

Semi Flex PCBs designed to fit into tight spaces. and conform to complex shapes or curved surfaces. They bent or flexed to follow the contours of the product or device, allowing for efficient use of space. This is particularly useful in miniaturized electronic devices where space limited.

Improved Reliability:

flexibility pcb fpc Gesflex circuit

The combination of rigid and flexible sections in a Semi Flex PCB. provides mechanical stability and reduces the risk of stress or fatigue on the board. The rigid sections used to mount components securely. preventing damage caused by vibrations or movement. The flexible sections allow for controlled bending.

Enhanced Durability

flexible circuits Design Versatility

Semi Flex PCBs designed to withstand repeated flexing or bending without failure. They constructed using flexible materials such as polyimide or polyester. which known for their excellent mechanical properties. This makes Semi Flex PCBs more resistant to shocks, vibrations. and thermal expansion compared to rigid PCBs

Design Flexibility

flex pcb design Experience and Expertise

Semi Flex PCBs offer greater design flexibility compared to rigid PCBs. The combination of rigid and flexible sections allows for the integration of components. and circuits in various orientations and configurations. This flexibility enables designers to optimize the layout. and improve the overall performance of the electronic device.


flex pcb Weight Reduction

Flexible PCBs enable innovative design solutions that are not feasible with rigid PCBs. They can be easily shaped, folded, or twisted. to fit unconventional or irregular spaces. enabling more creative product designs. This versatility is especially advantageous in industries such as aerospace. where complex and compact designs are often required.

Easier Assembly

flex pcb Improved Thermal Management

Semi Flex PCBs can simplify the assembly process compared to fully flexible PCBs. The rigid sections provide stability during component placement and soldering. making it easier for automated assembly equipment to handle the boards. This can help streamline production and improve overall efficiency.


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consumer electronics for flexible pcb

Consumer Electronics

Semi Flex PCBs used in smartphones, tablets, wearables, and other portable electronic devices. They enable the boards to flex and fit into compact and slim designs. while providing the necessary rigidity for mounting components like displays, connectors, and batteries.


Automotive Electronics

In the automotive industry, Semi Flex PCBs employed in infotainment systems. instrument clusters, control units, and other electronic components. They can withstand vibrations and temperature variations. while allowing for flexible installation in curved or shaped spaces within the vehicle.

defense for flexible FPC

Aerospace and Defense

Semi Flex PCBs are extensively used in the aerospace and defense sectors. They employed in avionics systems, satellites, drones, and military equipment. The combination of flexibility and rigidity allows the PCBs to withstand harsh environments. space limitations, and mechanical stresses while maintaining reliability.

medical devices for flexible pcb

Medical Devices

Medical devices often require flexible and compact PCB solutions. Semi Flex PCBs used in applications such as implantable devices. medical sensors, diagnostic equipment, and wearable health monitoring devices. They provide the necessary flexibility for conforming to the shape of the human body. while maintaining stable connections for critical components.

Wireless Appliances

Industrial Equipment

In industrial settings, Semi Flex PCBs used in control systems. automation equipment, and machinery. They designed to fit into tight spaces, follow curved surfaces. and withstand rugged operating conditions.

LED Lighting PCB

LED Lighting

Semi Flex PCBs utilized in LED lighting applications. They allow for flexible integration of LEDs in curved. or irregularly shaped lighting fixtures, enabling innovative lighting designs.