Electronics Forum | Wed Sep 22 14:45:01 EDT 2004 | Michelle Ogihara
As many people have participated in this email string, including competitors and customers of Sawa, I would like to respond to especially one rather detailed email expressing concerns with this stencil cleaning system. Also, this teaches me to keep
Electronics Forum | Wed Mar 27 07:01:26 EDT 2019 | charliedci
200uM seems high. I say this because typically our solder stencils in this application are between 80uM and 100uM thick which would leave the component height less than that after reflow. However if your not experiencing any shorting between pads I w
Electronics Forum | Tue Mar 26 10:30:28 EDT 2019 | pavel_murtishev
Hello, Could you please tell me if there is any industry standard specifying QFN to PCB standoff after soldering? Is any gap allowed? Browsing IPC-A-610, I have found nothing. Any input would be appreciated. Regards
Electronics Forum | Thu Mar 28 13:19:14 EDT 2019 | davef
There is no industry standard for BTC stand-off height. "IPC-7093A Design and Assembly Process Implementation for Bottom Termination SMT (BTC) Components" just finished "Final Draft for Industry Review" in December 2018. It mentions stand-off height
Electronics Forum | Wed Mar 27 04:32:49 EDT 2019 | pavel_murtishev
Charliem, Thank you for the input. Following this logic, in case if there are no soldering issues, pad coverage and voiding levels are within acceptable limits and a gap between BTC and pad let us say 200um, this could be accepted, right? IPC-A-61
Electronics Forum | Thu Mar 04 18:18:02 EST 2004 | Ken
There is a japanese company that makes a ultrasonic hand-held stencil cleaner. I demo'd it for a day and it was fantastic! It even cleaned epoxy stencils. Can't recall the price...but it should be much much less than the smart sonic and other "mac
Electronics Forum | Fri Mar 05 06:59:31 EST 2004 | t_white
We use a SAWA to clean our stencils and it performs quite well on solder paste but not so great with epoxy. Operators find the machine very easy to use and like mentioned before it takes up minimal space and has a lower intial and operating cost.
Electronics Forum | Mon Mar 29 18:17:48 EST 2004 | kerryn
It should be noted that some of the main reasons to change from manual cleaning to automated stencil cleaning are: � Manual cleaning is not consistent � quality is totally in the operators hands � Contamination left on the stencil and in the aperture
Electronics Forum | Thu Mar 04 14:20:41 EST 2004 | Robert
Another question... I use 500gm jars of Kester 256. After a job is complete the used solder is collected and put back into the jar. Generally while a job is run, the jar and used paste could be left out/open for up to 4 hours. A piece of seran wrap i
Electronics Forum | Tue Mar 09 14:22:09 EST 2004 | billschreiber
There is an article on our web site by Richard Clouthier, �SMT Stencil Cleaning: A Decision That Could Impact Production.� He talks about how high pressure sprays can damage the delicate land mass areas between fine-pitch apertures. High pressure ai
