Received: |
by ipc.org (Smail3.1.28.1 #2)
id m0tMeDS-0000MJC; Mon, 4 Dec 95 10:58 CST |
Old-Return-Path: |
<miso!ccm2.hf.intel.com!Kenneth_R_Kirby> |
Date: |
Mon, 04 Dec 95 08:34:00 PST |
Precedence: |
list |
X-Loop: |
|
Message-ID: |
|
X-Status: |
|
Status: |
O |
X-Mailing-List: |
|
From [log in to unmask] Sat Apr 27 15: |
24:32 1996 |
TO: |
|
Return-Path: |
|
Resent-Message-ID: |
<"sDrNh2.0.uBH.YYomm"@ipc> |
Subject: |
|
From: |
|
Resent-Sender: |
|
Resent-From: |
|
Parts/Attachments: |
|
|
---------------------------- Forwarded with Changes ---------------------------
From: Kenneth R Kirby at HFCCM14
Date: 12/1/95 8:40AM
To: [log in to unmask] at Internet_Gateway
Subject: Solder balls
-------------------------------------------------------------------------------
I am not sure if this message went out so in case it bumped into an astroid
while traveling through cyberspace I am resending.
1. When wavesoldering with no-clean flux and nitrogen, solder balls seem
to be a common problem. While solder mask is part of the problem I have
found that the lead length of connectors, sip's and other inline
componets have the greatest effect on solder ball production. By
cutting the leads to .080-.085 from the standard length of .110-.120
we can eliminate the solder balls. The problem is that you can not buy
connectors and other components at the storter lead length. The
manufactures claim no one is asking for shorter leads. I have not been
able to find any documentation that backs up my claim. If you have the
same requirement or have a article about lead length and solder balls
please let me hear from you.
2. IPC. Do you know about this? Have you done any testing? I believe
that we need a lead length spec for the no-clean process. Electrovert
knows that this is a problem and so do most of the people I have talked
with at the major flux companies. Can IPC help?
|
|
|