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February 2002

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From:
John Moses <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 11 Feb 2002 14:51:44 -0500
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If the IPC 610 labels it as a process indicator then it is not truly a defect correct?  Therefore it does not need rework, but does require process improvement.  

By the way, thanks for all of your responses regarding the upside down chip resistors.  

John Moses


>>> [log in to unmask] 02/11/02 11:32AM >>>
The entrapment of chemical process chemistries is an issue because material can become entrapped in the kerf.   If the component in upside down it cannot be cleaned.  The rev C version of the IPC 610 does call this a process indicator so for that reason I
guess it has become a non isuue.

Dyane White
Process/Technical Trainer
Philips Ultrasound




                    Mel Parrish
                    <mparrish@SOLDERIN           To:  [log in to unmask] 
                    GTECH.COM>                   cc:  (bcc: Dyane White/ATL-BTL/MS/PHILIPS)
                    Sent by: TechNet             Subject:  Re: [TN] Upside down chip resistors
                    <[log in to unmask]>
                                                 Classification:

                    02/08/02 05:22 PM
                    Please respond to
                    "TechNet E-Mail
                    Forum."; Please
                    respond to Mel
                    Parrish






Agree with MoonMan, but for discussion, this criteria was included in the
standards some time ago and was a carry over from the Mil Specs. The testing
was accomplished then to determine if there was justification to consider
orientation of these components. The tests for a particular program proved
that there was a very significant increase in component operational life if
the component was face up.
We didn't look at the "why" although there was speculation concerning
entrapment of process chemistries, or thermal issues for the film close to
the board.
IPC-A-610C calls this a Process Indicator for Class 2 and 3 which wouldn't
support rework.  If the long term reliability of the component was a
concern, you might look at effective methods to correct it (not point to
point soldering).  Best option is to orient up if it by process if required.

Mel Parrish
Soldering Technology International
Madison, AL
256 705 5530
256 705 5538 Fax
[log in to unmask] 


-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Earl Moon
Sent: Friday, February 08, 2002 12:51 PM
To: [log in to unmask] 
Subject: Re: [TN] Upside down chip resistors


The less rework, the better. When replacing or reworking any chip device,
using hand soldering techniques, chances are damage will ensue.

MoonMan

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