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Epec's Blog | Electronics Manufacturing Solutions

Paul Tome

Paul Tome
As Product Manager of Flex & Rigid-Flex Circuits, Paul oversees our entire flex & rigid-flex product line. Though Paul's main responsibility is customer technical support, he is involved in each project from the beginning conceptual stages to delivery. He works directly with customers on their specific design requirements and makes sure that each product is designed correctly, troubleshooting any issues that may arise in the process. Paul came to Epec with 24 years of a great variety of experience in the electronics industry. He has been involved in all aspects of the industry including sales, engineering, and manufacturing. He has worked with PCBs and equipment manufacturing and has also been the owner of an engineering service and trust bureau. Previously, he was president at Advanced Circuit Services. Paul's experience and expertise make him an indispensable part of Epec's team. Paul holds a mechanical engineering degree from Seneca College.

Recent Posts


Various Stiffener Materials for Flexible Circuit Boards

Written by Paul Tome
Posted on April 23, 2019 at 12:42 PM

Flexible circuit boards are necessary in numerous applications where a design requires the circuit to be bent within the electrical equipment or electronic device. However, it is not desired to have the flexible circuit board bend adjacent to connectors, mounted components, solder joints, and hole patterns. In these instances, a stiffener needs to be designed in to add rigidity and stability so that the flex circuit performs reliably.

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Flexible Circuit Board Material Selection

Written by Paul Tome
Posted on April 15, 2019 at 9:54 AM

Selecting the optimum flex circuit board material is a key element to the success of a flexible circuit design. A wide variety of materials and configurations are available to address the needs of today’s design applications.

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Design Comparison: Flex Circuit with Stiffeners vs. Rigid-Flex PCB

Written by Paul Tome
Posted on April 2, 2019 at 10:49 AM

When developing a flex PCB based design, one of the most common early decisions is whether a flex circuit with stiffener(s) will meet the design requirements or if a rigid-flex construction is necessary or more effective. While there is some overlap between the two methodologies, there are significant capability, performance, and cost differences that require review to ensure a successful design.

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Integrating Flex with Rigid PCB to Improve Design

Written by Paul Tome
Posted on March 27, 2019 at 9:49 AM

The integration of a flex circuit(s) with rigid PCBs into a rigid-flex configuration can solve many of today’s design challenges. The combination of the mechanical capabilities of flex circuits with the functionality of rigid PCBs is a solution that provides many benefits, including improved reliability, tighter packaging capabilities, high speed signal performance, reduced assembly costs, and opportunities for further overall design packaging reductions.

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How to Specify Stiffener Requirements in Flex PCB Design Drawings

Written by Paul Tome
Posted on March 14, 2019 at 1:39 PM

Stiffeners are a key design element in most flex designs and have a significant impact on both the performance and reliability of the finished flex circuits. As a result, stiffeners need to be fully and accurately defined in the data set. Not doing so may result in a finished part that does not meet your requirements.

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Differences of Via in Pad Technology in Flex Circuits vs Rigid PCBs

Written by Paul Tome
Posted on March 5, 2019 at 10:52 AM

Many of today’s rigid-flex circuit designs utilize the same high-density components found in rigid PCB designs. This requires the use of blind and or buried vias to allow the signal lines to be routed out from within the high-density components or the high-density areas of the design. The most common component that we see driving this today is the 0.4mm pitch BGA package.

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Flex PCB Stackup Documentation

Written by Paul Tome
Posted on April 3, 2018 at 11:57 AM

The flex PCB stackup documentation is an important component of the data set of a flexible printed circuit board design. It consists of a description of a flex or rigid-flex circuit board that defines in detail the specific material requirements and construction of the design.

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Flex PCB EMI Shielding Methods and Materials

Written by Paul Tome
Posted on March 26, 2018 at 3:26 PM

Many electronics assemblies that utilize flexible printed circuit boards are sensitive to either absorbing or emitting electromagnetic interference (EMI). If EMI is left uncontrolled it can negatively impact the performance of the design and in extreme cases completely prevent it from functioning.

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Why Pre-Bake Flex PCB Prior To Assembly?

Written by Paul Tome
Posted on March 15, 2018 at 10:05 AM

The pre-baking of flex printed circuit boards (PCB) immediately prior to assembly is an industry standard requirement that is documented in IPC2223 sec 5.3.5, IPC-FA-251 sec. 3.2.1.1.2 and by material suppliers (i.e. DuPont Pyralux Technical Manual sec. 5.23). This applies to all polyimide-based flex and rigid–flex designs. But why is pre-baking done prior to assembly, rather than earlier in the circuit board manufacturing stage?

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Common Flex Circuit Technical Issues That Delay Quick Turn Orders

Written by Paul Tome
Posted on March 6, 2018 at 2:20 PM

When ordering flex circuit boards online, quick turn order delivery timelines can incur setbacks if the data set is either incomplete or if the design has technical issues. Technical issues can be related to either manufacturability or the end use of the parts. These issues then often require multiple communications to resolve and in some worst-case scenarios, extensive design revision. Any of these issues will of course delay the delivery of the finished parts.

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