Flexible Circuit Boards

Custom Flexible PCB Manufacturing

FPC are the ideal choice when you need flexible PCB that can be shaped into different configurations. They're designed to fit the electronic device, and offer lightweight and durable products for various applications, from wearable to medical equipment.

As a leading flexible printed circuit board manufacturer, Sienta can offer high-quality and customized FPC to meet your requirements with the freedom to design any packaging geometry.

With a growing demand for flexible circuit boards, Sienta are ready to take on any challenge and deliver top-quality products at competitive prices!

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Flexible Circuit Boards
  • 300 +

    Professional Employees

  • 15000 +

    Monthly Production Capacity

  • 12000 +

    Plant Area

  • 99 %+

    Customer Satisfaction Rate

Types of Flexible PCB

Sienta specializes in manufacturing high-precision flexible PCBs in 1-10 layers for quick-turn prototypes and mass production. ISO 9001:2008, UL, ISO 14001, ROHS, and TS16949 approval demonstrate our commitment to quality control.

  • Double Layer FPC

    As a leading flexible PCB supplier, Sienta can provide double sided flexible circuit board within 3-5 working days. And also support flexible PCB assembly service including components sourcing.

  • Transparent FPC

    Transparent FPC is a special type of FPC where transparency is achieved by using a transparent material as the substrate and conductive traces. Count on us for tailor-made transparent FPC solutions, exceptional quality, and personalized support.

  • Rigid Flex PCB

    As a reputable leader in rigid-flex PCB manufacturing, Sienta provides tailor-made boards that meet your requirements. Trust our expertise for high-quality rigid-flex boards that meet your project's unique demands.

  • Flex PCB Assembly

    FPC assembly involves mounting surface mount components, such as resistors, capacitors, integrated circuits, and connectors, onto the flexible substrate using various techniques such as soldering, conductive adhesive bonding, or laser ablation.

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Flexible PCB Fabrication Capabilities

Limit Tolerance Normal tolerance Remark
Board cutting & thickness Layer / 1-10 layer 1-10 layer  
cutting size: 250mm mm 250*1000mm 250*500mm  
Min. thickness mm 0.075mm 0.10mm  
Other auxiliary material Adhesive stiffener um PSA:50um PSA:50um  
hot setting adhesive um 12.5/25/40um 12.5/25/40um  
PI stiffener um PI: 1.0-13mil PI: 1.0-13mil  
Other stiffener type / steel, Al, silicon steel sheet    
Drilling Min. drilling hole size mm 0.1 0.2  
hole diameter tolerance mm ±0.075 ±0.1  
PTH hole wall copper thickness um 8/15/25 8/15/25  
Exposure Min line width/space mm 0.05/0.05 0.075/0.075  
hole ring mm 0.125 0.2  
offset tolerance mm 0.1 0.15  
Line width tolerance mm ±0.03 ±0.04  
Distance between hole edge to outline mm ≥0.4 ≥0.5  
Lamination Cover-layer tolerance mm 0.15 0.2  
PI stiffener with outline mm ±0.3 ±0.3  
Sensitive PSA mm ±0.3 ±0.3  
FR4 location tolerance mm ±0.3 ±0.3  
Ink Soler mask thickness um 8 15  
Silk screen thickness um 8 15  
Profile R angle for etching cutting die mm 0.5 0.5  
Steel die tol. mm LS: ±0.075 LS: ±0.075  
mm HS: ±0.01 HS: ±0.01  
Cutting die tol. mm Etching: ± 0.20 Etching: ± 0.30  
mm Wooden: ± 0.30 Wooden: ± 0.50  
Laser tol. mm ± 0.05 ± 0.05  
Offset tol. for fingers mm ± 0.10 ± 0.10  
Surface treatment Immersion gold um Ni: 2.0~5.0 Ni: 2.0~5.0  
Au: 0.03~0.08 Au: 0.03~0.08  
Plating tin um 8~20 8~20  

Benefits Of Flexible Circuit Boards

  • High-density wiring

    FPC can accommodate more wiring in a small space, making it ideal for high-density applications.

  • Lightweight and Thin

    FPC is made from flexible materials such as polyimide or polyester film, making it lightweight, compact, and thin, which is suitable for applications that require a lightweight and thin design.

  • Flexible and foldable

    FPC can be bent, folded, and rotated without damaging the circuit, making it adaptable to different shapes and spatial layout requirements.

  • Three-dimensional assembly

    FPC has excellent spatial layout capabilities and can achieve three-dimensional assembly, integrating component assembly and wire connection.

  • High reliability

    Because FPC uses flexible base materials, it has strong resistance to shock, vibration, and stress cracking, which enhances the reliability of the circuit board.

  • Low production cost

    Compared with rigid circuit boards, FPC has lower production costs, is more flexible, and can be manufactured with automated processes, which improves production efficiency.

Why Choose Sienta for Flexible PCB

Whether you're looking for a double sided flex circuit or complex multi-layer flexible PCB, Sienta can provide an instant quote and manufacture your boards in as fast as 24 hours.

  • High-quality production achieved through advanced automation equipment.
  • Improve production efficiency, achieve 48-hour rapid customization of products, and deliver within 7 day.
  • All the PCB service will be 100% tested and inspected according to standards.
  • ISO 9001:2008, UL, ISO14001, ROHS, and TS16949 approved.

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Flexible Circuit Boards


  • Q What is your MOQ(Minimum Order Quantity)?

    We have no MOQ limited.Sample and mass production all can support.

  • Q What is needed for quotation?

    FPC&rigid-flex PCB&PCB:Quantity, Gerber file and Technical requirements(material,surface finish treatment, copper thickness,board thickness ,...)
    PCBA:PCB information, BOM list

  • Q Can you manufacture my PCB from a picture?

    No, we cannot accept BMP, GIF, TIFF, or JPG pictures as the manufacturing file.If you do not have gerber file, you can send us sample to copy it.

  • Q Are my files safe?

    We ensure complete safety and security of your files and protect our customers' intellectual property throughout the entire process. Any documents provided by our customers are kept strictly confidential and are never shared with any third parties.

  • Q How long will it take to receive my quotation?

    We will respond your quotation within 24 hours to the quotation requests.

  • Q How can I pay?

    We accept payments by PayPal, cash, bank transfer (T/T),WU,Alipay. If need other payment method please contact us (sienta@sienta.com.cn).

  • Q What's your transport method?

    We use UPS, FedEx, or DHL to ship the boards. If you have your own freight forwarding company, we can also work with them.

  • Q Do you offer free sample?

    We can offer samples, but you must pay for them first. If you go ahead with mass production later on, the cost of the samples will be deducted.We look forward to establishing a long-term business relationship with you!

  • Q What is your standard lead time?

    As FPC&PCB belong to customized products,generally it is 3-7 days for samples and 10-20 days for mass products.The actual delivery date according to difficulty of the products, the quantity and etc.Please contact us to get different product lead time.

  • Q How do you control the product quality?

    We adhere to strict quality control standards set by ISO 9001, ISO 14001, IATF 16949, and SGS. All boards undergo 100% testing and we offer a range of inspection options including visual, X-ray, AOI, and ICT/FCT.

  • Q How many layer can you produce for flexible PCB?

    For FPC, we can produce from 1 layer to 8 layers.

  • Q How many layer can you produce for Rigid flexible PCB?

    For Rigid flexible PCB board, we can produce from 2 layer to 8 layers.

  • Q Which surface treatment can you produce for FPC, PCB and rigid flexi PCB?

    We can produce Immersion gold, immersion silver, OSP, hot air Levelling(L/F), Gold plating,ENIPIG, Immersion tin and etc.

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