Cap and Res Naming Convention?

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aglass0fmilk
Posts: 19
Joined: 05 Mar 2020, 18:39

Cap and Res Naming Convention?

#1 Post by aglass0fmilk » 09 Sep 2020, 17:39

Hi all,

Working with DipTrace 4.0 new libraries. I noticed each discrete chip cap/resistor size has several footprints available. They seem to vary in tolerance size (larger footprint for more tolerance on component placement).

An example of the naming scheme:
A 1206 capacitor has the following footprints available in the DipTrace 4.0 standard patterns library (under "Cap Chip Inch"):

- CAP_1206_M
- CAP_1206_N
- CAP_1206_L

What do the various "M", "N", and "L" suffixes officially mean?

Thanks!

Tomg
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Posts: 1792
Joined: 20 Jun 2015, 14:39

Re: Cap and Res Naming Convention?

#2 Post by Tomg » 09 Sep 2020, 21:11

The short answer - component density levels as dictated by the amount of land pattern protrusion: Least, Nominal & Most.

"Least" is capable of allowing the highest component density at the possible cost of mechanical durability, and "Most" is capable of allowing more durable mechanical connections at the cost of lower component density.

The long answer can be found here - https://electronics.stackexchange.com/q ... el-a-and-b
and here - http://www.circuitinsight.com/pdf/pcb_d ... ib_ipc.pdf
Tom

aglass0fmilk
Posts: 19
Joined: 05 Mar 2020, 18:39

Re: Cap and Res Naming Convention?

#3 Post by aglass0fmilk » 10 Sep 2020, 12:01

Thanks for the response! That clears that up.

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