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Different tolerances

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jameshead View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jameshead Quote  Post ReplyReply Direct Link To This Post Posted: 07 Apr 2015 at 12:59am
Originally posted by Tom H Tom H wrote:

Bottom Line is that regardless if the package is standard or unique, all Footprint Names will sort on the Mfr. Abbreviation and no longer sort by the component family abbreviation.


For a standard naming land pattern having the manufacturer abbreviation as a suffix instead of a prefix would be better in my view, in sorting footprints in a library.

When I'm looking for a standard footprint in a list I would prefer to see:

SON80P400X400X80-9N-TI
SON80P400X400X80-9N-AD

So all the SON80Ps are grouped together.

It kind of leads on better as the footprint name tells me from the beginning that it's a standard package, the size, then at the end that it's a Texas Instruments or Analog Devices variant.

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Tom H View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Tom H Quote  Post ReplyReply Direct Link To This Post Posted: 07 Apr 2015 at 7:37am
We already thought of putting the manufacturer abbreviation as the Suffix, however, we're trying to have a universal naming convention that fits all parts created in FP Designer for Unique packages and connectors. Their naming convention is MfrNameAbvr_MfrPartNumber.
We want ALL parts to sort by the component manufacturer abbreviation regardless if it is a Standard Part or a Non-standard Part or a Connector.
 
Did you download the latest IPC-7351C Naming Convention Proposal -
 
You are suggesting that all "Standard" parts have the mfr. abbreviation as the land pattern name suffix and all "Non-standard" parts have the mfr. abbreviation as the land pattern name prefix.
 
Or do you have a suggestion for the non-standard land pattern names?
 
Or is this what you prefer? The 1-13 land pattern subcommittee will have to vote on this.
 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jameshead Quote  Post ReplyReply Direct Link To This Post Posted: 07 Apr 2015 at 7:51am
Thanks Tom, I downloaded the latest copy from Dr Munie this morning.  Last Friday and Monday were a bank holiday here in the UK.

The Manufacturer_Manufacturer'sPartNumber naming is very sensible for non-standard parts and I can see the sense in extending it to standard footprints.

I find it neater when viewing a list of land patterns in the CAD Tool's libraries to have ALL the same standard land patterns listed together though - and then easier to manipulate.

In terms of looking at a standard land pattern name and "processing" the name in my head:

I'm more interested in seeing if it's a standard land pattern, then what type it is, then what size it is, and to be honest I'm not bothered who the manufacturer is until the end.

If that makes sense!

I just wanted to add my tuppence halfpenny worth.

If the agreement is to do it the other way around then that's what I'll do.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jameshead Quote  Post ReplyReply Direct Link To This Post Posted: 07 Apr 2015 at 8:06am
I just want to add something - when I'm outputting my centroid data for the assembler with the footprint name I am telling them importantly that it's a standard land pattern so they know the appropriate rotation (for us, Level A).

For the assembler, they might only be interested in the SOIC127P600X...-3N bit and if it was at the front of the land pattern name it's easier for them to see.

If they see something different at the front then it's a bit more of a red flag to say "hang on, this is a non-standard footprint - lets double check everything".

Just a thought.  It would be interesting to get some feedback from assemblers and auto-insertion programmers.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Tom H Quote  Post ReplyReply Direct Link To This Post Posted: 07 Apr 2015 at 8:16am
That's a good idea.
 
All IPC Calculator parts have the mfr. abr. at the end of the land pattern name.
 
All Unique parts that use the mfr. recommended pattern have the mfr. abr. at the beginning of the land pattern name.
 
This way when you look at the land pattern name you know instantly if it's IPC-7351C calculation or mfr. recommended pattern.
 
We're looking at adding common sense to the land pattern name.
 
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