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KiCad / kicad-footprints

Official KiCad Footprint Libraries for Kicad version 5
https://kicad.github.io/footprints
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SIP3_11.6x8.5mm is not compatible to RECOM R-78 #133

Open mistoll opened 6 years ago

mistoll commented 6 years ago

AFAIK the footprint kicad-footprints/Package_SIP.pretty/SIP3_11.6x8.5mm.kicad_mod is the replacement of Converters_DCDC ... RECOM R-78 footprints. Both, the original footprints in the Converters_DCDC package and the SIP3_11.6x8.5mm are not compatible with the RECOM R-78 parts.

What's wrong: The courtyard and silk have the large part upwards, while is should be downwards. The datasheet R-78Bxx-1.5 has a recommended footpring graphik on the last page, with pin 1 marked.

poeschlr commented 6 years ago

Is this really the replacement for only these converters? @evanshultz i think you looked at the sip lib a while ago.

If so the footprint should be moved anyways. (All other converter footprints will be in the Converter lib added by https://github.com/KiCad/kicad-footprints/pull/127)

evanshultz commented 6 years ago

Thanks for looping me in. I'll take a look tomorrow.

evanshultz commented 6 years ago

Neither https://github.com/KiCad/Converters_DCDC_ACDC.pretty nor https://github.com/KiCad/kicad-footprints/tree/master/Converter_DCDC.pretty have a R-78Bxx-1.5 footprint. It would appear to have never existed. The new repo does have 6 RecomR-78 footprints, so I think the proper footprint should be created, if desired.

The SIP-3 is totally unrelated to any Recom parts as far as I can see.

@mistoll Why would you think there was a footprint replacement? It would be welcome if you could make the missing footprint.

@poeschlr I think this case can be closed unless some interesting information develops.

jkriege2 commented 6 years ago

Hi!

the original DCDCs from ReCOM are script-generated: https://github.com/pointhi/kicad-footprint-generator/pull/70

ideally, please modify the script to get a consistent style!

Best, JAN

mistoll commented 6 years ago

@evanshultz You are right, there's no R-78Bxx-1.5 footprint.

I referenced that datasheet, because the footprint layout graphik is unambigous there. While in other R-78 datasheets the footprint layout doesn't mark pin 1, thus allowing failures.

If the package SIP3_11.6x8.5mm is unrelated the line https://github.com/KiCad/kicad-footprints/blob/cf6453685279d9cad03ca35fd590b9d91e7af775/Package_SIP.pretty/SIP3_11.6x8.5mm.kicad_mod#L2 should be removed/changed.

Sorry, I currently have not enough time to fix those footprints, especially because I have no experience in sciprt generating footprints.

Werni2A commented 4 years ago

@evanshultz I think there is some kind of misunderstanding. Package_SIP:SIP3_11.6x8.5mm is meant for R-78E-0.5 and is therefore unrelated to R-78B-1.5 which requires a different footprint.

However the script generated Converter_DCDC:Converter_DCDC_RECOM_R-78E-0.5_THT can replace Package_SIP:SIP3_11.6x8.5mm as they are the same footprint. I'm not sure how to check that no symbol in the lib uses this footprint and would break if I remove it. Is there some script to verify this? I tried to search for the footprint in the symbol library which returned no results.

If you want I can create a PR to remove SIP3_11.6x8.5mm