SMD Feedthrough Capacitors

[jamesrlucas]

I am looking to use some feedthrough capacitors in some design I am working on, however there are currently no footprints in the libraries. Before I start creating & submitting footprints, I'd like to ask for opinions on how to go about it.

Example devices

Murata 0603 TDK 0603 & 0805 Murata 0805 AVX 0805 & 1206 Knowles 0805, 1206, 1806 & 1812 Murata 1206

All have slightly different recommendations on land patterns (if any!)

Questions:

1: Does anyone have access to the IPC recommendations? (if any!) - I have no idea if feedthrough caps are included or not. 2: Are these footprints we could script?

3. Would a single generic footprint be OK, or should we use manufacturer-specific footprints?
4. What library to put them in - Capacitor_SMD or Filter?

Thanks,

James

[cpresser]

Questions:

1: Does anyone have access to the IPC recommendations? (if any!) - I have no idea if feedthrough caps are included or not.

See https://github.com/pointhi/kicad-footprint-generator/pull/438, at least one outdated IPC-SM-782 document is linked there. That generator is also partially related, it does RLC footprints.

2: Are these footprints we could script?

Yes but .... AFAIK there is no script that can handle it. It needs to be created. Those parts a rather special, so it is not mandatory to script them.

3. Would a single generic footprint be OK, or should we use manufacturer-specific footprints?

Depends. I would start comparing them and see if there can be a consensus footprint.

4. What library to put them in - Capacitor_SMD or Filter?

Everything is a filter if you are brave enough! Capacitor_SMD sounds better to me, but I have no arguments.

[cpresser]

From the Murata 1206 Datasheet. Quite interesting, since there is more paste than copper area: