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Epec's Blog | Electronics Manufacturing Solutions


How Flexible PCB Material Selection Affects Lead Times

Written by Paul Tome
Posted on July 21, 2021 at 10:10 AM

There are a very wide variety of materials available to construct a flexible circuit. The materials range from different types of copper, copper thicknesses, core/coverlay and adhesive thicknesses, adhesive types, stiffener types and thicknesses, PSAs, shielding films, flexible soldermask colors, etc. Inadvertently specifying unique or non-standard materials can result in significant delivery delays as they may not be standard stock at either the manufacturer or the supplier.

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Benefits of Using Air Gap Rigid-Flex PCB Constructions

Written by Paul Tome
Posted on July 8, 2021 at 10:44 AM

Advancing technology has impacted rigid-flex PCB designs in the same manner as rigid printed circuit boards. Increasing interconnect requirements and smaller form factors require higher circuit densities and increased layer counts. The impact of these elements on rigid-flex circuit designs is potential reliability issues both electrically and mechanically.

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Flexible PCB Line and Space Limitations to Be Aware Of

Written by Paul Tome
Posted on May 12, 2021 at 9:30 AM

In some areas of a flexible circuit board design, the trace widths and spacings, trace to pad spacings, and via pad sizes are the same as used in rigid circuit boards but will differ in other areas. This is due to the flexible nature of the polyimide materials used, the type of material used to encapsulate the external layers, and the unique plating process used for most flex circuit designs.

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Rigid-Flex PCB Stack-ups for Impedance Controlled Designs

Written by Paul Tome
Posted on March 10, 2021 at 10:15 AM

Impedance controlled circuits in a rigid-flex PCB design is a common requirement throughout the industry in a wide range of applications. Having Impedance control, however, does create an additional challenge for designs that have very demanding minimum bend requirements.

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Differences in Controlled Impedance Between a Rigid PCB and Flexible PCB

Written by Paul Tome
Posted on October 6, 2020 at 9:32 AM

As with many of today’s high-speed rigid circuit board designs, flex and rigid-flex PCB designs also require controlled impedance signals. The impedance vales are the same, typically ranging from 50 ohm single ended up to 120 ohm differential pairs. However, there are differences in how the impedance values are achieved due to the mechanical bend requirements that a flex or rigid-flex circuit board must meet that a rigid PCB does not.

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Flex Circuit Design Guidelines for High-Current Applications

Written by Paul Tome
Posted on June 11, 2020 at 9:12 AM

Higher current carrying flex circuit designs create challenges that need to be addressed early in the design process to ensure both a manufacturable design and that it will reliably meet the bend requirements. These items range from material types/availability, bend capability/flexibility, impact on standard signal lines, and part cost.

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Minimum Flexible PCB Specifications Needed for an Accurate Quote

Written by Jim Marsh
Posted on March 20, 2020 at 10:43 AM

In the rigid printed circuit board (PCB) world, you can easily generate a quote with cookie cutter specs, such as 0.062” thick, with FR4, green soldermask, and white silkscreen. With those standard specifications, you could quote a huge number of rigid PCBs.

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Common Prototype vs. Production Failures in Flexible Circuit Boards

Written by Paul Tome
Posted on March 6, 2020 at 9:44 AM

The argument can be made that the toughest environment for a flexible circuit boards is the prototyping phase of the design development. During this process, the circuit is potentially installed and removed multiple times as the form, fit, and function are evaluated and qualified. There’s the opportunity for the flex circuit to be inadvertently mishandled, dropped, bent beyond the design limits, etc.

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Using Rigid-Flex PCBs to Improve Design Reliability - Q&A

Written by Paul Tome
Posted on March 3, 2020 at 9:46 AM

At the conclusion of our webinar, Using Rigid-Flex PCBs to Improve Design Reliability, we had several questions submitted to our presenter, Product Manager of Flex & Rigid-Flex Circuits, Paul Tome. We compiled these into a readable format on our blog.

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Flex Circuit Design Challenges: Electrical vs. Mechanical

Written by Paul Tome
Posted on February 18, 2020 at 9:21 AM

Flex and rigid-flex circuit boards are a combination of both electrical and mechanical requirements that allow for solutions to many tight packaging requirements. However, this combination is also the potential source of design challenges as some electrical requirements can have a negative impact on the mechanical bend capabilities of flex circuits. If not, correctly addressed the reliability of the finished design may be compromised.

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