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Date: | 1 Mar 1996 11:22:52 -0800 |
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Reply to: RE>Re[2]: Electroless Ni/Immersion A
Thad:
Based on a reliability report generated by HP: If the gold content is less
than 2% of the resultant solder joint volume, no appreciable solder
embrittlement will occur. Therefore, the VOLUME of gold on ANY pad must be
less than 2% of the resultant solder joint VOLUME, or ~1% of the VOLUME of
solder paste applied to that pad. (e.g. if 0.005" solder paste is applied, gold
thickness should be < 50 micro-inches.)
Bill Fabry
Truevision, Inc.
--------------------------------------
Date: 3/1/96 5:42 AM
To: Bill Fabry
From: Thad McMillan
I have a follow up question, what is the mininum associated gold
thicknesses for gold on areas to be soldered. In Table 3-2 it only
states .8 um (Max).
Thanks,
[log in to unmask]
______________________________ Reply Separator
_________________________________
Subject: Re: Electroless Ni/Immersion Au
Author: [log in to unmask] at Dell_UNIX
Date: 2/28/96 5:18 AM
IPC-6012, Qualification and Performance Specification for Rigid Printed
Boards, identifies the following minimums:
Class 1 Class 2 Class 3
Nickel to act as a
barrier for copper-tin 1.0 um 1.3 um 1.3 um
compounds
Gold for edge-board
connectors and areas not 0.8 um 0.8 um 1.3 um
to be soldered
um = micrometers
It should be noted that this document is in proposal stage. These numbers
are subject to revision during the development of the document. This
document is to replace IPC-RB-276.
****************************************
Lisa M. Williams
Technical Staff
IPC
2215 Sanders Road
Northbrook, IL 60062
phone: (847) 509-9700 x 379
fax: (847) 509-9798
email: [log in to unmask]
****************************************
On Mon, 26 Feb 1996 [log in to unmask] wrote:
> A question,
>
> Are there any reports or IPC data which details the minimum amounts of
> electroless nickel needed to provide a sufficient barrier to copper migration
> and the minimum amounts immersion gold needed to provide sufficient plating
> finish.
>
> Concerns are solderability failures and corrosion of components.
>
> Annmarie Rainford
> Merix Corporation
> Forest Grove, Oregon 97116
> 503-359-9300 x74426
>
>
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Subject: Re[2]: Electroless Ni/Immersion Au
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