Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


Solder beads on small caps and res.

Views: 1541

MS

#45760

Solder beads on small caps and res. | 29 November, 2006

Any recommendation to reduce solder beads next to 0402, 0603 and 0805 caps and res? What about home plate vs. bow tie stencil aperture design?

This message was posted Add this forum to your site! Click to learn more. the Electronics Forum @

reply »

John S.

#45776

Solder beads on small caps and res. | 29 November, 2006

We've used both effectively to resolve this issue. Check with your stencil manufacturer. Often, they can give you a very good starting place on issues like this since they see everyone's designs.

John S.

reply »

#45777

Solder beads on small caps and res. | 29 November, 2006

I have used a 10% area reduction with home plates on 6 mil stencils with good success. If you're using 5 mil stencils you might go with 0 or 5% reduction.

reply »

#45783

Solder beads on small caps and res. | 29 November, 2006

#46030

Solder beads on small caps and res. | 6 December, 2006

I would be glad to help you eliminate the solder balling and beading that you are seeing. As this is a fairly common defect, I would like to forward you an Application Note that we have developed that explains the cause and possible solutions.

Most commonly, slowing the ramp rate in your reflow profile to ~1 degree C per second is a effective way to stop mid-chip balling. I would try this before spending the resources on a new stencil.

Feel free to contact me offline. My information is below.

Sincerely,

Mario Scalzo, CSMTPE, Dartmouth 6 Sigma Green Belt Technical Support Engineer - Indium Corporation mscalzo@indium.com / 1-800-4-indium

reply »

#46176

Solder beads on small caps and res. | 15 December, 2006

Contact Steve Yen @714-636-6211 or incoming@usastencils.com He'll be happy to help to with that. Good luck !

reply »

PCB X-Ray Inspection System

SMT in-printer dispensing