Electronics Forum | Fri Jul 19 13:09:55 EDT 2019 | edhare
Hi, Are you referring to the condition illustrated here? ... https://www.semlab.com/qfn-solder-fillets In this case, the solder was wicked down an attached un-filled PTH via. Ed Hare SEM Lab, Inc.
Electronics Forum | Mon Jul 22 02:13:31 EDT 2019 | jandon
some PQFN package configurations have no toe exposed or do not have a continous solderable surface on the exposed toe and a toe fillet will not form. (IPC-A-610F 8.3.13)
Electronics Forum | Thu Aug 22 23:09:34 EDT 2019 | sssamw
Yes, you need work with supplier to see if can run pin in paste for these connectors, even do some experiments. A step-up stencil would be good for these connectors, also connectors pin size and length match with PCB hole design.
Electronics Forum | Tue Jul 23 07:55:24 EDT 2019 | ashray
how can I change the language in MPM up 2000? the machine has a default language set to german I wanted to know if it can be changed to English. I tried in BIOS there is no option to do that. Please guide me on this.
Electronics Forum | Tue Jul 23 12:55:34 EDT 2019 | cyber_wolf
If you were going from a type 3 to type 4 powder, would you do a full blown documented evaluation ? Flux and alloy remain the same.
Electronics Forum | Wed Jul 24 10:07:44 EDT 2019 | ameenullakhan
Hi Team, Can anyone suggest me best stencil opening for CCGA. Attached is the component details. Solder paste : water solube - ORL0 - Jtsd 001 ( Sn63/Pb37) Any one has qualified the same. Regards, Ameen
Electronics Forum | Wed Jul 24 17:25:01 EDT 2019 | davef
Your solder stencil design should follow all basic rules for solder stencil design are followed in accordance with IPC-7525 including adherence to an area ratio of 2:3 or greater and an aspect ratio of 1.5 or greater.
Electronics Forum | Tue Jul 30 12:47:56 EDT 2019 | davef
Ameen: Send me your email address by selecting the link under my avatar to the left. Thanks.
Electronics Forum | Wed Aug 07 02:24:54 EDT 2019 | ameenullakhan
Hi Dave, Yes the lead was there before reflow. After reflow it has bent inside. The component was inspected before placement. We are unable to analyze, what might have went wrong. Regards, Ameen
Electronics Forum | Fri Aug 09 03:59:35 EDT 2019 | sssamw
Did you check the pin location accuracy before placement? I mean if possible pin was hit or misaligned a little before placement, so the pin cannot inserted in hole then bent. And maybe you need contact your component supplier to study together.
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