Flex Circuit Manufacturer
Flex circuits are changing the way electronics companies fabricate new products. They take up less space than traditional wire harnesses, and are able to bend, twist and fold freely in three dimensions. This flexibility allows engineers to incorporate more features into their designs, and is especially useful in the oil industry for borehole measurements. The polyimide material that flex circuits are made from disperses heat better than rigid PCBs, making them ideal for extreme temperatures.
Flex PCBs are designed with a layer of copper attached to an insulating substrate such as polyimide. The copper is typically printed using photochemical etching, and small holes are drilled into the layers before being plated with copper. This process is often done by a robot to ensure consistency and quality. The finished product is then soldered, and a protective surface mask is applied to the copper traces to prevent short circuits.
The maximum size that a flex circuit manufacturer facility can produce is determined by the design requirements. While some manufacturers can produce flex boards up to several feet in length, others specialize in shorter, more precise sizes. The shortest flex circuits are used in medical devices, while the longest are often found in automotive components and industrial sensors.
Maximum Size of Flex Circuit Manufacturer Facility Can Produce?
Depending on the application, a flex circuit may be made of a single- or double-sided construction. Some flex circuits also have a dual-access design, which combines an insulated polyimide layer and copper on both sides of the board. Other flex circuits have an adhesive-based or adhesive-less copper layer. An adhesive-based structure requires acrylic adhesive to make contact with the copper, while an adhesive-less structure allows the copper to bond directly to the polyimide.
A flex circuit’s reliability is determined by the materials and manufacturing processes that are used. A durable flex circuit should be designed to limit the amount of bending it will undergo, and avoid sharp corners that could cause stress points and copper fatigue. Other best practices include avoiding 90° bends, keeping the pads close to the conductors, and using larger bend radii. The layout should also feature staggered traces and a tapered edge to minimize stress.
To reduce stress, a flex circuit should use the minimum amount of copper to achieve its function and have a low impedance profile. This can be achieved by incorporating a cross-hatch pattern that reduces the total area of the copper plane while maintaining its strength. Alternatively, the copper can be etched to reduce its thickness. This provides superior impedance and reliability, but requires more precision than standard etching methods.
To make the most of a flex circuit’s strength, it should be plated with an appropriate metal. The most common is immersion gold, but other options such as HASL and OSP are available. The final surface finish is essential to ensure that the flex circuit performs well under stressful conditions. Sierra Circuits manufactures high-quality flex and rigid-flex circuit boards for any application. We offer fast turnaround times, exceptional customer service, and top-of-the-line craftsmanship. To learn more about our flex and rigid-flex capabilities, contact us today.
