# \#fab-notes

**URL:** https://sierraconnect.protoexpress.com/tag/fab-notes/300.md

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## [The fabrication notes most often missing from customer files](https://sierraconnect.protoexpress.com/t/the-fabrication-notes-most-often-missing-from-customer-files/4292)

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**Author:** [@steve.carney](https://sierraconnect.protoexpress.com/u/steve.carney)\
**Replies:** 1\
**Last updated:** [July 23, 2026, 4:10pm UTC](https://sierraconnect.protoexpress.com/t/the-fabrication-notes-most-often-missing-from-customer-files/4292 "2026-07-23T16:10:46Z")

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Here’s some of the things we often see missing or unclear at Sierra when customers send us fab notes: Controlled impedance requirements Board manufacturing specifications Which side is the primary side Material require…