# Flex and rigid-flex **URL:** https://sierraconnect.protoexpress.com/c/manufacturing/flex-and-rigid-flex/26.md [Latest](https://sierraconnect.protoexpress.com/latest.md) · [Categories](https://sierraconnect.protoexpress.com/categories.md) · [Tags](https://sierraconnect.protoexpress.com/tags.md) --- ## [About the Flex and rigid-flex category](https://sierraconnect.protoexpress.com/t/about-the-flex-and-rigid-flex-category/34)
**Author:** [@lucy.sierracircuits](https://sierraconnect.protoexpress.com/u/lucy.sierracircuits)\ **Replies:** 0\ **Last updated:** [September 5, 2023, 10:26pm UTC](https://sierraconnect.protoexpress.com/t/about-the-flex-and-rigid-flex-category/34 "2023-09-05T22:26:17Z")
The Flex and Rigid-Flex category on SierraConnect is dedicated to the unique challenges and innovations in flexible and rigid-flex PCB designs. Here, you can discuss design techniques, materials, and manufacturing proces… --- ## [Rigid-Flex Layer Preference](https://sierraconnect.protoexpress.com/t/rigid-flex-layer-preference/4340)
**Author:** [@phil.holden](https://sierraconnect.protoexpress.com/u/phil.holden)\ **Replies:** 3\ **Last updated:** [August 12, 2026, 1:41pm UTC](https://sierraconnect.protoexpress.com/t/rigid-flex-layer-preference/4340 "2026-08-12T13:41:49Z")
For a 2-layer rigid-flex with a single-layer flex limb, do you have a fabrication preference for whether the flex copper continues from the top or bottom rigid layer, or is either acceptable? --- ## [The History of Flexible PCBs and Their Modern Application](https://sierraconnect.protoexpress.com/t/the-history-of-flexible-pcbs-and-their-modern-application/4354)
**Author:** [@lucy.sierracircuits](https://sierraconnect.protoexpress.com/u/lucy.sierracircuits)\ **Replies:** 0\ **Last updated:** [August 12, 2026, 12:20pm UTC](https://sierraconnect.protoexpress.com/t/the-history-of-flexible-pcbs-and-their-modern-application/4354 "2026-08-12T12:20:59Z")
Originally published at: https://www.protoexpress.com/blog/the-history-of-flexible-pcbs-and-their-modern-applications/ Modern electronics manufacturers often face contradictory requirements when integrating complex c… --- ## [How to Pick the Right Flex PCB Materials for Your Application?](https://sierraconnect.protoexpress.com/t/how-to-pick-the-right-flex-pcb-materials-for-your-application/3708)
**Author:** [@Pooja\_Mitra](https://sierraconnect.protoexpress.com/u/Pooja_Mitra)\ **Replies:** 2\ **Last updated:** [November 24, 2025, 5:59pm UTC](https://sierraconnect.protoexpress.com/t/how-to-pick-the-right-flex-pcb-materials-for-your-application/3708 "2025-11-24T17:59:02Z")
Originally published at: How to Pick the Right Flex PCB Materials? | Sierra Circuits When selecting flex PCB materials, you need to consider the application type (dynamic or static), stiffener requirements, and routi… --- ## [POLL: How often do you use flex or rigid-flex PCBs?](https://sierraconnect.protoexpress.com/t/poll-how-often-do-you-use-flex-or-rigid-flex-pcbs/3496)
**Author:** [@lucy.sierracircuits](https://sierraconnect.protoexpress.com/u/lucy.sierracircuits)\ **Replies:** 0\ **Last updated:** [August 22, 2025, 3:58pm UTC](https://sierraconnect.protoexpress.com/t/poll-how-often-do-you-use-flex-or-rigid-flex-pcbs/3496 "2025-08-22T15:58:14Z")
poll --- ## [What is material to be use for PCIe Gen 6.0/7.0?](https://sierraconnect.protoexpress.com/t/what-is-material-to-be-use-for-pcie-gen-6-0-7-0/3206)
**Author:** [@kabaleeswaran.kr](https://sierraconnect.protoexpress.com/u/kabaleeswaran.kr)\ **Replies:** 5\ **Last updated:** [May 28, 2025, 1:11pm UTC](https://sierraconnect.protoexpress.com/t/what-is-material-to-be-use-for-pcie-gen-6-0-7-0/3206 "2025-05-28T13:11:38Z")
Hi Team, what is material to be use for PCIe Gen6.0/7.0. ? Magtron, Rogers RO4835T, Isola Astra® MT77 will support in this case? --- ## [Flex PCB Design Guidelines Part 2: Optimizing Layout for Manufacturing](https://sierraconnect.protoexpress.com/t/flex-pcb-design-guidelines-part-2-optimizing-layout-for-manufacturing/3147)
**Author:** [@milan](https://sierraconnect.protoexpress.com/u/milan)\ **Replies:** 2\ **Last updated:** [May 22, 2025, 5:40pm UTC](https://sierraconnect.protoexpress.com/t/flex-pcb-design-guidelines-part-2-optimizing-layout-for-manufacturing/3147 "2025-05-22T17:40:22Z")
Originally published at: https://www.protoexpress.com/blog/flex-pcb-design-guidelines-for-manufacturing/ In this webinar, we discuss flex PCB design guidelines for manufacturing. The flex PCBs offer many advantages f… --- ## [IPC Standards and Guidelines for Testing Flex PCBs](https://sierraconnect.protoexpress.com/t/ipc-standards-and-guidelines-for-testing-flex-pcbs/3061)
**Author:** [@lucy.sierracircuits](https://sierraconnect.protoexpress.com/u/lucy.sierracircuits)\ **Replies:** 0\ **Last updated:** [April 9, 2025, 12:24pm UTC](https://sierraconnect.protoexpress.com/t/ipc-standards-and-guidelines-for-testing-flex-pcbs/3061 "2025-04-09T12:24:27Z")
Originally published at: https://www.protoexpress.com/blog/ipc-guidelines-and-testing-for-flex-pcbs/ What you should know about IPC guidelines for your flex PCB designs. --- ## [Designing High-Temperature Flex PCBs: 6 Challenges with Solutions](https://sierraconnect.protoexpress.com/t/designing-high-temperature-flex-pcbs-6-challenges-with-solutions/2986)
**Author:** [@Mohamed\_Faheemuddin](https://sierraconnect.protoexpress.com/u/Mohamed_Faheemuddin)\ **Replies:** 0\ **Last updated:** [March 12, 2025, 3:39pm UTC](https://sierraconnect.protoexpress.com/t/designing-high-temperature-flex-pcbs-6-challenges-with-solutions/2986 "2025-03-12T15:39:11Z")
Originally published at: https://www.protoexpress.com/blog/designing-high-temperature-flex-pcbs-challenges-with-solutions/ Designing flex PCBs for high-temperature (\>125°C) applications presents challenges like therm… --- ## [Case Study: Reverse Engineering a Flex PCB to Generate Design Files](https://sierraconnect.protoexpress.com/t/case-study-reverse-engineering-a-flex-pcb-to-generate-design-files/1547)
**Author:** [@Mohamed\_Faheemuddin](https://sierraconnect.protoexpress.com/u/Mohamed_Faheemuddin)\ **Replies:** 0\ **Last updated:** [June 25, 2024, 3:08pm UTC](https://sierraconnect.protoexpress.com/t/case-study-reverse-engineering-a-flex-pcb-to-generate-design-files/1547 "2024-06-25T15:08:17Z")
Originally published at: https://www.protoexpress.com/blog/case-study-reverse-engineering-flex-pcb-to-generate-design-files/ Our PCB design engineers reverse-engineered a flex circuit to recreate the design files and… --- ## [Case Study: Designing Loose-Leaf Rigid-Flex PCB Stack-up For Enhanced Flexibility](https://sierraconnect.protoexpress.com/t/case-study-designing-loose-leaf-rigid-flex-pcb-stack-up-for-enhanced-flexibility/1455)
**Author:** [@Mohamed\_Faheemuddin](https://sierraconnect.protoexpress.com/u/Mohamed_Faheemuddin)\ **Replies:** 0\ **Last updated:** [May 23, 2024, 1:41pm UTC](https://sierraconnect.protoexpress.com/t/case-study-designing-loose-leaf-rigid-flex-pcb-stack-up-for-enhanced-flexibility/1455 "2024-05-23T13:41:02Z")
Originally published at: https://www.protoexpress.com/blog/case-study-implementing-loose-leaf-rigid-flex-pcb-stackup-for-enhanced-flexibility/ When designing a flex circuit board, balancing structural reliability and… --- ## [Flex PCB for wearable](https://sierraconnect.protoexpress.com/t/flex-pcb-for-wearable/878)
**Author:** [@sandra](https://sierraconnect.protoexpress.com/u/sandra)\ **Replies:** 3\ **Last updated:** [March 4, 2024, 1:31pm UTC](https://sierraconnect.protoexpress.com/t/flex-pcb-for-wearable/878 "2024-03-04T13:31:46Z")
I am designing a flex PCB for a wearable device. What heat management techniques can I implement for efficient heat dissipation? --- ## [Stitching vias in flex PCBs](https://sierraconnect.protoexpress.com/t/stitching-vias-in-flex-pcbs/989)
**Author:** [@rblack](https://sierraconnect.protoexpress.com/u/rblack)\ **Replies:** 1\ **Last updated:** [February 5, 2024, 6:48pm UTC](https://sierraconnect.protoexpress.com/t/stitching-vias-in-flex-pcbs/989 "2024-02-05T18:48:33Z")
Can you use stitching vias in flex PCBs? Are there any stiffener recommendations when using vias on flex sections? --- ## [When you ask ChatGPT a fun fact about rigid-flex PCBs](https://sierraconnect.protoexpress.com/t/when-you-ask-chatgpt-a-fun-fact-about-rigid-flex-pcbs/948)
**Author:** [@lucy.sierracircuits](https://sierraconnect.protoexpress.com/u/lucy.sierracircuits)\ **Replies:** 0\ **Last updated:** [January 26, 2024, 6:54pm UTC](https://sierraconnect.protoexpress.com/t/when-you-ask-chatgpt-a-fun-fact-about-rigid-flex-pcbs/948 "2024-01-26T18:54:04Z")
So what do you think of that: The concept of flexible electronics, which includes rigid-flex PCBs, dates back to ancient times. In the 4th century BC, the ancient Greeks discovered a naturally occurring flexible materia… --- ## [7 rigid-flex DFM errors you can avoid](https://sierraconnect.protoexpress.com/t/7-rigid-flex-dfm-errors-you-can-avoid/696)
**Author:** [@lucy.sierracircuits](https://sierraconnect.protoexpress.com/u/lucy.sierracircuits)\ **Replies:** 0\ **Last updated:** [December 12, 2023, 5:41pm UTC](https://sierraconnect.protoexpress.com/t/7-rigid-flex-dfm-errors-you-can-avoid/696 "2023-12-12T17:41:50Z")
--- ## [13 Common DFM Mistakes in Rigid-Flex PCBs and Techniques to Avoid Them](https://sierraconnect.protoexpress.com/t/13-common-dfm-mistakes-in-rigid-flex-pcbs-and-techniques-to-avoid-them/226)
**Author:** [@Mohamed\_Faheemuddin](https://sierraconnect.protoexpress.com/u/Mohamed_Faheemuddin)\ **Replies:** 0\ **Last updated:** [October 10, 2023, 1:23pm UTC](https://sierraconnect.protoexpress.com/t/13-common-dfm-mistakes-in-rigid-flex-pcbs-and-techniques-to-avoid-them/226 "2023-10-10T13:23:39Z")
Originally published at: https://www.protoexpress.com/blog/rigid-flex-webinar-altium/ Sierra and Altium have teamed up to bring you a rigid-flex webinar. We discussed rigid-flex PCB design for manufacturing tips, sam… --- ## [TIP: Flex PCB thickness](https://sierraconnect.protoexpress.com/t/tip-flex-pcb-thickness/223)
**Author:** [@atar.mittal](https://sierraconnect.protoexpress.com/u/atar.mittal)\ **Replies:** 0\ **Last updated:** [October 10, 2023, 1:49am UTC](https://sierraconnect.protoexpress.com/t/tip-flex-pcb-thickness/223 "2023-10-10T01:49:13Z")
TIP: Avoid unnecessary circuit thickness which hinders flexible capabilities. The thickness of the flex area is determined by the bend radius needed. If parts of the flex circuit need to be thicker, add stiffeners. --- ## [7 Must-Knows for Your Flex PCB Design](https://sierraconnect.protoexpress.com/t/7-must-knows-for-your-flex-pcb-design/168)
**Author:** [@lucy.sierracircuits](https://sierraconnect.protoexpress.com/u/lucy.sierracircuits)\ **Replies:** 0\ **Last updated:** [September 28, 2023, 6:44pm UTC](https://sierraconnect.protoexpress.com/t/7-must-knows-for-your-flex-pcb-design/168 "2023-09-28T18:44:58Z")
Originally published at: https://www.protoexpress.com/blog/5-must-knows-for-your-first-flex-design/ Flex PCB design requires a slightly different approach than rigid PCBs. While flex PCBs can provide major savings in…