TECHNET Archives

January 2008

TechNet@IPC.ORG

Options: Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Subject:
From:
Graham Naisbitt <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Graham Naisbitt <[log in to unmask]>
Date:
Fri, 11 Jan 2008 14:08:49 +0000
Content-Type:
text/plain
Parts/Attachments:
text/plain (126 lines)
Christopher and Techies

I need to correct your SIR methods:

Please read IPC-TM-650 2.6.3.7 and you should also read through the  
new SIR Handbook IPC 9201A

If you are testing no-clean, run 40C 93% not 85/85.

The recommended voltage should be 20v/mm = 5v - no reverse bias

Measurements at 20 minute intervals.

The spec you quoted was discredited around 10 years ago.

Chris Schaefer - I would strongly recommend that you run such tests  
for process characterisation using the new IPC B52 coupon. This allows  
for component over-mounting to mimic what will happen in the actual  
assembly processes.

Graham Naisbitt

Gen3 Systems - Engineering Reliability in Electronics



On 11 Jan 2008, at 13:31, Christopher Nash wrote:

> Chris I have listed most of the differences between the IPC SIR and  
> the IPC
> ECM below.
>
> Test Board: SIR (B-24), ECM (B25)
> Board Pattern Spacing: SIR (.020"), ECM (.0125")
> Cleaning: SIR [Zero Ionics (Omegameter)] ECM (Clean to 4E10 Ohms)
> Temperature/Humidity: SIR (85°C, 85%RH, 168 Hours), ECM (65C, 85%RH,  
> 500
> Hours)
> Stress Bias: SIR (45-50 Volts DC), ECM (10 Volts)
> Pre-Bias Stabilization Period: SIR (3 hours at T&H), ECM (24 hours  
> at T&H)
> Measurement Bias: SIR (-100 Volts DC), ECM (45-50 Volts DC)
> Time Readings: SIR (24, 96, 168 hours), ECM (96, 500 hours)
> Dendrites/Corrosion: SIR (None > 25% of Spacing), ECM (None > 20% of
> spacing)
>
> Christopher J. Nash
> Indium Corporation
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Chris Schaefer
> Sent: Thursday, January 10, 2008 6:02 PM
> To: [log in to unmask]
> Subject: [TN] ECM or SIR - What Electrical test is best?
>
> Techneters,
>
> I am having to perform some tests to qualify the wash process using an
> alternative cleaning chemistry and would like to know what the real
> differences are between the ECM and SIR tests besides the time it  
> takes to
> perform the test measurements.
>
> Thanks Much,
>
> Chris
>
> ---------------------------------------------------
> Technet Mail List provided as a service by IPC using LISTSERV 15.0
> To unsubscribe, send a message to [log in to unmask] with following  
> text in
> the BODY (NOT the subject field): SIGNOFF Technet
> To temporarily halt or (re-start) delivery of Technet send e-mail to
> [log in to unmask]: SET Technet NOMAIL or (MAIL)
> To receive ONE mailing per day of all the posts: send e-mail to
> [log in to unmask]: SET Technet Digest
> Search the archives of previous posts at: http://listserv.ipc.org/archives
> Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16
> for additional information, or contact Keach Sasamori at [log in to unmask] 
>  or
> 847-615-7100 ext.2815
> -----------------------------------------------------
>
>
> ***This email, its content, and any files transmitted with it, are  
> intended solely for the addressee(s) and may be legally privileged  
> and/or confidential. If you are not the intended recipient, please  
> contact the sender by return and delete the material from any  
> computer. Any review, retransmission, dissemination, or other use  
> of, or taking of any action in reliance upon this information by  
> persons or entities other than the intended recipient is prohibited.
>
> Messages sent via this medium may be subjected to delays, non- 
> delivery, and unauthorized alteration. This email has been prepared  
> using information believed by the author to be reliable and  
> accurate, but Indium Corporation makes no warranty as to accuracy or  
> completeness. Indium Corporation does not accept responsibility for  
> changes made to this email after is was sent. Any opinions or  
> recommendations expressed herein are solely those of the author.  
> They may be subject to change without notice.***"
>
> ---------------------------------------------------
> Technet Mail List provided as a service by IPC using LISTSERV 15.0
> To unsubscribe, send a message to [log in to unmask] with following  
> text in
> the BODY (NOT the subject field): SIGNOFF Technet
> To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask] 
> : SET Technet NOMAIL or (MAIL)
> To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask] 
> : SET Technet Digest
> Search the archives of previous posts at: http://listserv.ipc.org/archives
> Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 
>  for additional information, or contact Keach Sasamori at [log in to unmask] 
>  or 847-615-7100 ext.2815
> -----------------------------------------------------

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------

ATOM RSS1 RSS2