# \#flexible-pcb

**URL:** https://sierraconnect.protoexpress.com/tag/flexible-pcb/226.md

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## [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)

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**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")

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poll

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## [Reliable methods for connecting Flexible PCBs to Rigid boards without connectors](https://sierraconnect.protoexpress.com/t/reliable-methods-for-connecting-flexible-pcbs-to-rigid-boards-without-connectors/3381)

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**Author:** [@SkylarRd](https://sierraconnect.protoexpress.com/u/SkylarRd)\
**Replies:** 5\
**Last updated:** [August 18, 2025, 10:31pm UTC](https://sierraconnect.protoexpress.com/t/reliable-methods-for-connecting-flexible-pcbs-to-rigid-boards-without-connectors/3381 "2025-08-18T22:31:02Z")

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What are the reliable ways to connect a 4-layer flexible PCB to a rigid board without using a connector? In printed circuit board production, are techniques like soldering the flex onto pads and reflowing, ACF bonding, …

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## [Feasibility of Single-Layer Flexible PCBs](https://sierraconnect.protoexpress.com/t/feasibility-of-single-layer-flexible-pcbs/3428)

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**Author:** [@gigio](https://sierraconnect.protoexpress.com/u/gigio)\
**Replies:** 4\
**Last updated:** [August 8, 2025, 4:53pm UTC](https://sierraconnect.protoexpress.com/t/feasibility-of-single-layer-flexible-pcbs/3428 "2025-08-08T16:53:02Z")

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Is it possible to design a simple flexible PCB with just a single copper layer?

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## [Stiffeners requirement for flexible PCB design](https://sierraconnect.protoexpress.com/t/stiffeners-requirement-for-flexible-pcb-design/3362)

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**Author:** [@gigio](https://sierraconnect.protoexpress.com/u/gigio)\
**Replies:** 5\
**Last updated:** [July 17, 2025, 4:58pm UTC](https://sierraconnect.protoexpress.com/t/stiffeners-requirement-for-flexible-pcb-design/3362 "2025-07-17T16:58:01Z")

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I’m prototyping a 250 mm × 6 mm flexible PCB that carries three 3 × 3 mm DFN packages (hand-assembled). All DFNs will be on the top side; any stiffeners would go on the bottom, opposite the components. Design guides from…

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## [Designing High-Temperature Flex PCBs: 6 Challenges with Solutions](https://sierraconnect.protoexpress.com/t/designing-high-temperature-flex-pcbs-6-challenges-with-solutions/2986)

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**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")

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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…