# \#fr4

**URL:** https://sierraconnect.protoexpress.com/tag/fr4/23.md

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## [Why consumer power adapters & small appliances often use single-sided PCBs](https://sierraconnect.protoexpress.com/t/why-consumer-power-adapters-small-appliances-often-use-single-sided-pcbs/3906)

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**Author:** [@Rilley](https://sierraconnect.protoexpress.com/u/Rilley)\
**Replies:** 6\
**Last updated:** [March 26, 2026, 3:38pm UTC](https://sierraconnect.protoexpress.com/t/why-consumer-power-adapters-small-appliances-often-use-single-sided-pcbs/3906 "2026-03-26T15:38:09Z")

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I’ve noticed that many consumer power adapters and small appliances use single-sided FR-2 boards with through-hole components. Is it just about cost and wave soldering, or are there other manufacturing advantages to usin…

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## [Why FR4 Material is Commonly used in PCB Fabrication?](https://sierraconnect.protoexpress.com/t/why-fr4-material-is-commonly-used-in-pcb-fabrication/164)

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**Author:** [@lucy.sierracircuits](https://sierraconnect.protoexpress.com/u/lucy.sierracircuits)\
**Replies:** 0\
**Last updated:** [September 28, 2023, 6:39pm UTC](https://sierraconnect.protoexpress.com/t/why-fr4-material-is-commonly-used-in-pcb-fabrication/164 "2023-09-28T18:39:33Z")

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Originally published at: https://www.protoexpress.com/blog/why-fr4-material-in-pcb-fabrication/ FR4 is the most common grade dielectric material that is used in the fabrication of circuit boards. This material is inc…