# 7 common DFM errors and how to avoid them

**URL:** https://sierraconnect.protoexpress.com/t/7-common-dfm-errors-and-how-to-avoid-them/663
**Category:** Design for Manufacturing
**Tags:** dfm, annular-ring, solder-mask, silkscreen
**Created:** [December 4, 2023, 6:47pm UTC](https://sierraconnect.protoexpress.com/t/7-common-dfm-errors-and-how-to-avoid-them/663 "2023-12-04T18:47:15Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![lucy.sierracircuits](https://sea2.discourse-cdn.com/sierraconnect/user_avatar/sierraconnect.protoexpress.com/lucy.sierracircuits/32/8_2.png) [@lucy.sierracircuits](https://sierraconnect.protoexpress.com/u/lucy.sierracircuits)
#### Post date: [December 4, 2023, 6:47pm UTC](https://sierraconnect.protoexpress.com/t/7-common-dfm-errors-and-how-to-avoid-them/663/1 "2023-12-04T18:47:15Z")

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![7-Common-DFM-Errors-and-Ways-to-Avoid-Them](https://global.discourse-cdn.com/sierraconnect/original/1X/90df7a37c1fcabd93aef72eed381b8cd366ce723.jpeg)

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### Author: ![steve.carney](https://sea2.discourse-cdn.com/sierraconnect/user_avatar/sierraconnect.protoexpress.com/steve.carney/32/50_2.png) [@steve.carney](https://sierraconnect.protoexpress.com/u/steve.carney)
#### Post date: [December 4, 2023, 8:32pm UTC](https://sierraconnect.protoexpress.com/t/7-common-dfm-errors-and-how-to-avoid-them/663/2 "2023-12-04T20:32:45Z")

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Check your annular rings before sending your files. Sierra will tell you if there is a risk of tangency or breakout but some fabricators don’t.

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### Author: ![david](https://avatars.discourse-cdn.com/v4/letter/d/aeb1de/32.png) [@david](https://sierraconnect.protoexpress.com/u/david)
#### Post date: [December 5, 2023, 10:14pm UTC](https://sierraconnect.protoexpress.com/t/7-common-dfm-errors-and-how-to-avoid-them/663/3 "2023-12-05T22:14:45Z")

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Here is a fun one that combines issue 1 with issue 6. Ever hear that you should not route sideways through pins on a TSSOP? The reason is that the trace can get hot, break the mask, and then solder flows between the pins. It is not a short, but it sure does get flagged as one. Always route out the toe of the pin and then back into the other toe. Never go from side to side.