Gerard,
This is a prelimary run of boards for us. I am just trying to get
my ducks in a run before going and having the same conversation with
our board supplier.
The first set of numbers came out of table 3-1 in the draft.
Based on your comments, I'll start the conversation in the 8-12 micro
inch range.
Thanks
dave
Gerard O'Brien wrote:
>Dave - there is only one supplier of the thin Silver and they are now
>offering a thicker silver. Given that, the majority is thick silver.
>25 micro inches on what pad size? Did they follow the 30% rule for
>collimator to pad for XRF measurement? Were they using the correct energy
>level to measure I Ag?
>The 4553 group is actively working to determine the upper limit due to the
>fears of Ag3Sn IMC's that are known bad actors when it comes to solder joint
>embrittlement. I would suggest having an independent check on their
>thickness.
>
>Regards
>
>Gerard O'Brien
>Co-chairman 4-14 plating
>
>-----Original Message-----
>From: Dave Seymour [mailto:[log in to unmask]]
>Sent: Friday, May 27, 2005 9:03 AM
>To: [log in to unmask]
>Subject: Re: [TN] Immersion Silver - Fab notes
>
>All,
>
>The IPC draft IPC-4553 spec listed below mentions two types of valid
>silver plating.
>Thin 3-5 micro inch and Thick as 8-12 micro inch.
>
>What are board fabricators typically using Thin or Thick?
>
>Also, I saw a presentation from a board shop recently
>with Silver thickness up to 25 micro inch.
>
>It that too thick?
>
>What is too Thick?
>
>Thanks in advance,
>Dave Seymour
>
>
>Gerard O'Brien wrote:
>
>
>
>>There is a new spec that has just completed balloting - IPC-4553. Ken, you
>>can go the committee home page 4-14 at ipc.org and find a copy of the
>>
>>
>draft
>
>
>>that will soon be released.
>>
>>Regards
>>
>>
>>Gerard O'Brien
>>Co-chairman 4-14
>>
>>-----Original Message-----
>>From: Ken Patel [mailto:[log in to unmask]]
>>Sent: Wednesday, March 09, 2005 1:51 PM
>>To: [log in to unmask]
>>Subject: [TN] Immersion Silver - Fab notes
>>
>>All,
>>What kind of note should I put on fab drawing if I
>>want to use Immersion Silver as my surface finish. Is
>>there any IPC- document that also I can refer to as
>>part of my note.
>>
>>Any help will be appreciated.
>>
>>re,
>>ken patel
>>
>>
>>
>>
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>Dave Seymour, CID+
>Catapult Communications Inc.
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Catapult Communications Inc.
800 Perimeter Park Dr, Suite A
Morrisville, NC 27560
Direct: (919)653-4249
Main: (919)653-4180
Fax: (919)653-4297
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