Andrea:

This question comes up from time to time. IPC has no standard for lead 
pull strength, but did prepare a simple test method during one of its 
round robin programs. The test isn't necessarily "standardized" because 
it never went through the IPC document approval process, but I'd be happy to 
forward it to you. 

Basically, the test involves cutting the lead with a Dramel tool, 
securing it, then yanking it. A simple, straight-forward test. However, the 
problem is that there is no benchmark known to us regarding what a "good" 
lead should be able to sustain.

Send an email to me direct (not to TechNet) if you'd like a copy.

Mike Buetow
IPC Staff
2215 Sanders Road
Northbrook, IL 60062
P: 847-509-9700, ext. 335
F: 847-509-9798
[log in to unmask]



On 6 Jun 1997, Andrea Shurtz wrote:

> Does anyone know if there are specs for solder joint strength on gull wing 
> leaded parts like QFPs?  Are there standard test methods for how to measure 
> joint strength on these types of leads (destructive or non-destructive)?  I am 
> interested mainly in finding the strength on the leads of 20 mil and 25 mil 
> parts.  I am currently doing some "pull tests" and would like to see if there 
> is industry data out there to compare my results and methods with.  Any help 
> would be appreciated.
> 
> Thanks,
> Andrea Shurtz
> Lexmark Contract Manufacturing
> 
> ***************************************************************************
> * TechNet mail list is provided as a service by IPC using SmartList v3.05 *
> ***************************************************************************
> * To subscribe/unsubscribe send a message <to: [log in to unmask]>   *
> * with <subject: subscribe/unsubscribe> and no text in the body.          *
> ***************************************************************************
> * If you are having a problem with the IPC TechNet forum please contact   *
> * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask]      *
> ***************************************************************************
> 

***************************************************************************
* TechNet mail list is provided as a service by IPC using SmartList v3.05 *
***************************************************************************
* To subscribe/unsubscribe send a message <to: [log in to unmask]>   *
* with <subject: subscribe/unsubscribe> and no text in the body.          *
***************************************************************************
* If you are having a problem with the IPC TechNet forum please contact   *
* Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask]      *
***************************************************************************