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Flexible Printed Circuits (FPC) With FR-4 Stiffener on SF201 Polymide Substrate

Shipped: 12th-FEB-2024

1. Introduction of Flexible Circuits Flexible Circuits, also known as flex circuits or flexible printed circuit boards, are an innovative type of circuit board that offers flexibility in design and application. Unlike traditional rigid PCBs, flexible PCBs are made from flexible materials, typically polyimide or polyester, which allows them to bend, twist, and conform to fit the desired shape or space requirements.

A breakdown of a flexible circuit shows that it consists of three basic elements: copper foil, dielectric material and adhesive.

2. Purpose of Flexible Circuits - to provide interconnections between printed circuit boards and/or other components. - to serve as three-dimensional substrates for the mounting of SMT components, e.g., in photographic and video cameras. - to establish interconnections capable of withstanding dynamic flexing. - to form part of flex/rigid circuit boards.

3. Basic Types of Flexible Circuit There are four basic types of flexible circuits as described below:

1). Single-Sided Flexible Circuits This is the simplest type, and consists of a thin and flexible base material to which a copper foil is laminated by means of an adhesive. The finished circuit is frequently provided with a covercoat bonded to the copper side by means of an adhesive.

2). Double-Sided Flexible Circuits As the name suggests, the circuit consists of a thin and flexible base material with copper foil laminated to each side. The outer sides of the finished circuits are frequently provided with covercoats bonded to the outer sides (copper).

3). Multilayer Flexible Circuits A multilayer flexible circuit consists of a number of thin and flexible base laminates and copper foils laminated together by means of adhesive, in very much the same way as rigid multilayer boards. Also it is common practice to bond covercoats to the outer sides (copper).

4). Flexible Circuits with Rigid Areas In some cases, the flexible circuit must support a number of relatively heavy components or even a connector part. Therefore it is necessary to reinforce such an area. This is accomplished by bonding a stiffener to that area. The stiffener can be an extra layer of not too thin polyimide, or it can be a glass/epoxy laminate.

4. SF201 series Polyimide Shengyi's SF201 series materials are Single side adhesiveless flexible copper clad laminate based on polyimide substrates. These fleixible materials have dielectric constant of less than 3.7 and dissipation factor of less than 0.01 at 10 GHz. They have the thicknesses of 12.5um, 20um and 25um with ED copper, RA Copper and RTF copper of 12um, 18um, 35um and 70um thickness.

5. Features - Excellent soldering reliability, dimensional stability and chemical resistance. - Excellent flexiblility and electrical properties. - Halogen free,Flammability UL94 V-0. - Compatible with EU RoHS directive, free of Pb,Hg,Cd, Cr6+,PBB,PBDE, etc

6. FPC Stackup: 1-layer flexible PCB Coverlayer (Solder mask) Copper_layer_1 - 35 m Polyimide - 0.025 mm (1mil) Adhesive PI stiffener - 1mil

7. PCB Construction details: - Board dimensions: 260mm x 5 mm=1PCS, +/- 0.15mm - Minimum Trace/Space: 3/3 mils - Minimum Hole Size: 0.3mm - No Blind vias. - Finished board thickness: 0.15mm - Finished Cu weight: 1oz (1.4 mils) outer layers - Surface finish: Immersion Gold - Top Silkscreen: White - Bottom Silkscreen: No - Top Solder Mask: Yellow coverlay - Bottom Solder Mask: Yellow coverlay - 100% Electrical test used prior to shipment

8. PCB Statistics: Components: 12 Total Pads: 35 Thru Hole Pads: 0 Top SMT Pads: 35 Bottom SMT Pads: 0 Vias: 0 Nets: 2

9. Some Typical Applications: - Computer - mobile phone - digital camera, VCR - flat panel display - apparatus and instrument - automotive electronics

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