Design Guidance

2022-10-27 BEST

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Best Technology's policy is to identify and correct potential problems with flexible circuitry at the quoting stage, not after we accept your order. We can use any information you have and create a fully functional board for you.

We can accept various file formats with our state-of-the-art CAM software. Using our experience and knowledge of flex printed circuits, We can go through your supplied files and spot any potential design problems before they get to photo production. We can edit your files to make sure they are per DFM (Design for Manufacturability). Best Tech can also use a supplied schematic and design you a custom FPC from that!

To evaluate your flexible circuit and quote a firm price we need:

Information required for a ballpark quote

•Quantity desired

•Number of layers

•General size of the circuit

•Features such as stiffeners, adhesive tape, pins, connectors, etc.

Information required for a firm quote

•Drawing (Gerber data preferred)

•Quantity required

•Complete physical shape

•Materials: conductors, insulators, stiffeners, other

•Number of layers

•Plating requirements

•Applicable specifications

•Unusual areas of the circuit that BEST TECH should be aware of, such as unbonded or cut-away areas

•Tolerances clearly outlined (geometric profile preferred)

•Other requirements: conductor spacing, conductor width, border, etc.

•Special marking and/or packaging requirements

•Testing requirements: type, percent to be tested, and frequency. Is IPC-6013 testing required?

•Additional components that BEST TECH is expected to supply/assemble (inform BEST TECH of preferred suppliers if the components are unique)

Information required for manufacturing

All the information that is required for a firm quote, plus:

•Dimensional drawing including notes and requirements

•Artwork for conductors in digital format, coupons, and screened marking, if applicable (unless BEST TECH is to generate)

Supplying drawings

The “perfect drawing” will provide the following information:

•Cross-section diagram (i.e. material stack-up)

•Outline drawing of circuit

Material listing


•Hole chart

•Feature chart (i.e. minimum conductor width and spacing, and any other minimum spacing requirements)

•Dimensional tolerances

•Special plating requirements

•Marking requirements

•Testing requirements

•Special packaging requirements

Specify testing requirements

Testing is labor intensive and will directly impact costs and delivery schedules. Some tests are automated, others are manual. Test frequency must be considered as well as the destructive nature of some tests. All tests are documented and certificates of conformance are routine for BEST TECH.

Test requirements must be documented to avoid any confusion. Your sales and design engineer contacts can discuss these needs with you.

Physical testing options include, but are not limited to

•Dimensional measurements

•Ionic contamination

•Thermal shock


Electrical testing options include, but are not limited to


•Insulation resistance (IR)




•Dielectric, net-to-net

•Dielectric, high potential test of exterior insulation


Note: Standard electrical testing includes continuity (5 Ω ) and insulation resistance (40 mΩ @ 150 VDC).