Sender: |
|
X-To: |
|
Date: |
Fri, 27 Aug 1999 14:08:11 -0700 |
Reply-To: |
|
Subject: |
|
MIME-Version: |
1.0 |
Content-Transfer-Encoding: |
7bit |
Content-Type: |
text/plain; charset="iso-8859-1" |
From: |
|
Parts/Attachments: |
|
|
Does the product meet specified requirments...
Earl Moon
----- Original Message -----
From: Mcmaster, Michael <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, August 27, 1999 8:59 AM
Subject: Re: [TN] First Pass Yields
> Craig
>
> It depends on the definition of first pass yields. I've heard and seen
> it defined many ways. You can report a first pass yield through an
> imaging sequence (IL and OL) where you're looking at the amount of
> product produced with no defects (opens, shorts, etc). At electrical
> test, I've seen it reported on a piece-by-piece basis or a lot-by-lot
> basis. I've seen the same metrics at a Final Audit operation, also,
> measuring escapes from previous processes. Sometimes, first-pass will
> refer to the first-time build of part. Can you provide a clearer
> definition of "first-pass"? Otherwise it's hard to assess if 50-75% is
> "typical".
>
> ----------
> From: Craig Patterson [SMTP:[log in to unmask]]
> Sent: Friday, August 27, 1999 3:15 AM
> To: [log in to unmask]
> Subject: [TN] First Pass Yields
>
> Recently our bare board manufacturer indicated that his first
> pass yields
> from his electrical test for our six layer board (FR4, couple of
> BGA, some
> 20mil QFPs, 7" x 11") was about 70%. We were concerned that this
> may mean
> his process is not under control. He said that 50 to 75% first
> pass yield
> was typical in the industry. The failures were for various
> reasons from
> opens to mask on pads.
>
> Does anyone have an opinion regarding 75% reflecting the first
> pass yield
> as a benchmark of the board fab industry?
>
> ##############################################################
> TechNet Mail List provided as a free service by IPC using
> LISTSERV 1.8c
> ##############################################################
> To subscribe/unsubscribe, send a message to [log in to unmask]
> with following text in
> the body:
> To subscribe: SUBSCRIBE TECHNET <your full name>
> To unsubscribe: SIGNOFF TECHNET
> ##############################################################
> Please visit IPC web site (http://www.ipc.org/html/forum.htm)
> for additional
> information.
> If you need assistance - contact Gayatri Sardeshpande at
> [log in to unmask] or
> 847-509-9700 ext.5365
> ##############################################################
>
> ##############################################################
> TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c
> ##############################################################
> To subscribe/unsubscribe, send a message to [log in to unmask] with
following text in
> the body:
> To subscribe: SUBSCRIBE TECHNET <your full name>
> To unsubscribe: SIGNOFF TECHNET
> ##############################################################
> Please visit IPC web site (http://www.ipc.org/html/forum.htm) for
additional
> information.
> If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or
> 847-509-9700 ext.5365
> ##############################################################
##############################################################
TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c
##############################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in
the body:
To subscribe: SUBSCRIBE TECHNET <your full name>
To unsubscribe: SIGNOFF TECHNET
##############################################################
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information.
If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or
847-509-9700 ext.5365
##############################################################
|
|
|