Thoroughly frivolous question: Does anyone know what letter or number X gets mixed up with?
Best regards,
RAYE RIVERA
-----Original Message-----
From: TechNet <[log in to unmask]> On Behalf Of James Jackson, CID
Sent: Wednesday, November 4, 2020 3:01 PM
To: [log in to unmask]
Subject: Re: [TN] BGA Pin Numbering
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Michael,
Thanks for the reply. I had forgotten about ANSI. (I was rooting through the JEDEC documents).
The only thing that makes this iffy is the wording... "revision letter".
If I approach it with this, it'll most likely be dismissed with a 'it's not a revision'.
But it's a start.
Thanks again!
Regards,
James Jackson
Oztronics
On 2020-11-04 16:22, Kuczynski, Michael wrote:
> Per ASME Y14.35M
>
> All letters can be used as revision letters except I, O, Q, S, X and
> Z. These letters are not allowed because they can be mistaken for
> numbers or for other letters
>
> -----Original Message-----
> From: TechNet <[log in to unmask]> On Behalf Of James Jackson, CID
> Sent: November 4, 2020 5:02 PM
> To: [log in to unmask]
> Subject: [TN] BGA Pin Numbering
>
> I am in the process of creating a BGA footprint.
>
> This BGA is a 17x17 ball package - for this discussion, the particular
> dimensions are irrelevant.
>
> My question... the IPC footprint generator (Altium) starts the alpha
> section of numbering with the letter 'A' and then goes sequentially to
> B, C, D, E, F, G, H - and skips I. The next one is J, etc.
>
> Is this by some 'standard' or arbitrary. I have seen this done through
> the years with the skipping of the letters 'I', 'O', and... I don't
> remember the others, but think that there are a few others.
>
> I'm looking for some sort of 'reference' or published IPC statement
> (JEDEC perhaps?) that says, 'skip the following letters when creating
> BGA footprints'.
>
> (I hope my ramblings make sense...)
>
> --
> Regards,
>
> James Jackson, CID
> Oztronics
--
Regards,
James Jackson, CID
Oztronics
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