4L FPC Board

Product Description

• 4-Layer‍‌‍‍‌‍‌‍‍‌ Flexible Printed Circuit (FPC) Board is a high-density interconnect solution that can be used in applications where complex routing, signal integrity as well as mechanical flexibility in a small form factor are required. With a total thickness of 0.38 mm, 2 mil core polyimide as a base material, this board supports four conductive layers while still maintaining excellent capability of dynamic flex. A selective 2 mm polyimide (PI) stiffener is used to provide rigid, flat areas for connector attachment, component mounting, or mechanical fixation. The circuit is covered by a 50 µm coverlay which provides excellent insulation and mechanical protection. Surface finish is ENIG (2 μin gold) which ensures excellent solderability, corrosion resistance, and a flat coplanar surface for fine-pitch components. This 4-layer FPC is suitable for high-reliability applications in aerospace, medical devices, automotive, and advanced consumer electronics." ‍‌‍‍‌‍‌‍‍‌

Product Specifications

Product Advantages

• High‍‌‍‍‌‍‌‍‍‌ Circuit Density with Flexible Format

• Four layers help you do really complex routing, impedance controlled, and shielding in a very thin board, only 0.38 mm - really great for very small, high-speed, or high-pin-count designs.

• Mechanically Strong Reinforcement

• Stiffener made of 2 mm polyimide gives very good stiffness to connector areas, heavy components, or mounting holes - totally removes the requirement for separate rigid PCBs or metal backers and also allows the rest of the board to be fully flexible.

• Resilient Coverlay Protection

• Using a 50 um polyimide coverlay gives you all you can ask for in insulation, chemical resistance, and protection from mechanical abrasion - you get a level of quality much higher than a conventional solder mask for flex applications.

• ENIG Surface Finish.

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• Perfectly flat, coplanar surface, just right for fine-pitch BGAs, QFNs, and dense SMT assembly.

• Great solderability (even after multiple reflow cycles).

• High corrosion resistance and long shelf life.

• Gold thickness: 2 μin - sufficient for light wire bonding if necessary.

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• Thin yet Strong Polyimide Base

• 2 mil (0.05 mm) PI cores are highly resistant to heat (up to ~260°C reflow), absorb very little moisture, and have very high dielectric strength - these characteristics are absolutely necessary for multilayer flex reliability.

• Dynamic Flex Capability

• Only 0.38 mm total thickness for four layers, is enough for controlled dynamic bending in the non-stiffened areas, which makes these types of assemblies suitable for folding, sliding, or rotating.

• Signal Integrity & EMI Reduction

• Having a multilayer build makes it possible to have separate power/ground planes, which helps in not only reducing crosstalk but also raising the EMI performance level compared to single or double-sided FPCs.

• Flexible Stiffener Shape

• The 2 mm PI stiffener may be made in almost any shape (square, round, cut-out), to fit the connector footprint or the mounting point, making it a good mix of both rigidity and ‍‌‍‍‌‍‌‍‍‌flexibility.

Company Profile:

Founded in 1997, Multech PCB is a leading manufacturer of high-end printed circuit boards in China with nearly 30 years of industry experience. Founded by senior PCB experts, the company's headquartered locates in Qianhai, Shenzhen, with its production base is located in Huizhou. It covers a workshop area of over 20,000 square meters and is equipped with multiple modern automated production lines, with an annual output exceeding 2 million square meters, capable of efficiently handling prototype, medium and high volume orders.

Boasting a professional R&D team of more than 60 members, the company focuses on technological innovation, specializing in high-density multilayer boards, HDI, backplane PCBs, high-frequency boards, metal core PCBs, flexible and rigid-flex PCBs and other special PCBs. 80% of its products are exported to Europe, the United States, Japan and the Asia-Pacific region, widely used in high-tech industries such as telecommunications, industrial control, medical treatment, automotive and aerospace.

The company has passed international authoritative certifications including ISO9001, ISO14001, UL, RoHS and IATF16949, with fully compliant production processes and 100% full inspection before shipment to ensure stable and reliable quality. It has long provided one-stop PCB+PCBA solutions for global well-known enterprises, winning the trust of customers at home and abroad with high quality, cost-effectiveness and prompt delivery.

ISO 13485

ISO 9001

IATF 16949

ISO 14001

Manufacturing Process:

FAQ:

Q:What files do you use in bare pcb fabrication?

A:Gerber RS-274X,274D,Eagle and AutoCAD's DXF,DWG

Q:What format of Bom List you prefer?

A:We prefer in MS-Excel with Components Part No.,Manufacturer,Quantity,Value info, other format are also accepted.

Q:If all PCBAs will be tested before delivery if we provide the function testing method?

A:Yes, we ensure that each piece of PCBA will be tested before shipment, we ensure the goods we sent with good quality.