Dual Access Flex Circuits

Dual access flex circuits

Dual Access Flex Circuits also called double access FPC,are a unique configuration in flexible circuit design.

A dual access flex circuit is a single layer flex circuit that allows access to a copper layer independently from both sides of the component. This allows the same placement capability of a component or contact as a dual layer design, but with only one layer of circuitry. Both sides of the design support PTH components/connectors as well as ZIF

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Dual Access Flex Circuits

Capabilities Of Dual access flex circuits

Parameters Technical Specifications UNIT CAPABILITY
Limit Tolerance Normal Tolerance Remark
Board cutting &
thickness
Layer
cutting size: 250mm
Min. thickness
/
mm
mm
1-6 layer
250*1000mm
0.075mm
1-6 layer
250*500mm
0.10mm
/
/
/
Other auxiliary
material
Adhesive stiffener
hot setting adhesive
PI stiffener
Other stiffener type
um
um
um
/
PSA:50um
12.5/25/40um
PI: 1.0-13mil
steel, Al, silicon steel sheet
PSA:50um
12.5/25/40um
PI: 1.0-13mil
/
/
/
/
/
Drilling Min. drilling hole size
hole diameter tolerance
mm
mm
0.1
±0.075
0.2
±0.1
/
/
PTH hole wall copper thickness um 8/15/25 8/15/25 /
Exposure Min line width/space
hole ring
offset tolerance
Line width tolerance
Distance between hole edge to outline
mm
mm
mm
mm
mm
0.05/0.05
0.125
0.1
±0.03
≥0.4
0.075/0.075
0.2
0.15
±0.04
≥0.5
/
/
/
/
Lamination Coverlay tolerance
PI stiffener with outline
Sensitive PSA
FR4 location tolerance
mm
mm
mm
mm
0.15
±0.3
±0.3
±0.3
0.2
±0.3
±0.3
±0.3
/
/
/
/
Ink Soler mask thickness
Silk screen thickness
um
um
8
8
15
15
/
/
  R angle for etching cutting die mm 0.5 0.5 /
Profile Steel die tol. mm
mm
LS: ±0.075 LS: ±0.075 /
Cutting die tol. mm
mm
Etching: ± 0.20
Wooden: ± 0.30
Etching: ± 0.20
Wooden: ± 0.30
/
Laser tol.
Offset tol. for fingers
mm
mm
± 0.05
± 0.10
± 0.05
± 0.10
/
Surface
treatment
Immersion gold um Ni: 2.0~5.0
Au: 0.03~0.08
Ni: 2.0~5.0
Au: 0.03~0.08
/
Plating tin um 8~20 8~20 /

Benefits Of Dual access flex circuits

  • Increased Interconnect Density

    With conductive traces on both sides of the flexible substrate, Dual Access Flex Circuits enable higher interconnect density compared to single-sided flex circuits. This allows for more complex and compact electronic designs.

  • Enhanced Flexibility

    Dual Access Flex Circuits retain the flexibility characteristic of traditional FPCs, allowing them to bend, twist, and conform to the desired shape or design requirements.

  • Improved Signal Integrity

    The use of double-sided conductive traces can lead to better signal integrity and reduced signal losses. This is especially important in high-speed data transfer applications.

  • Space Efficiency

    Dual Access Flex Circuits contribute to space-saving in electronic devices. The ability to route traces on both sides of the substrate reduces the need for additional layers, connectors, and space-consuming components.

  • Versatility

    These circuits offer versatility in accommodating complex interconnections and component placements. Their two-sided design allows for efficient routing of signals and power to various parts of the electronic assembly.

  • Design Freedom

    Dual Access Flex Circuits provide engineers and designers with greater freedom in creating innovative and space-efficient electronic products. They can be tailored to meet specific design requirements and application needs.

FAQ

  • 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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