Steve,
Thanks for the advice. I’ll enquire if this is something that the SMT personnel can accomplish prior to reflow.
I think that during hand soldering the top chip is skewing slightly while soldering the opposite side, thus causing the incomplete fillet. And you’re right about the caps being fragile to hand soldering, I thought about that as well.
Hand soldering is certainly an art form when done correctly and something you can’t always teach. It’s like the differences between paint-by-number and fine artwork. The finer skills are inherent in the individual.

Quadruple stacks? Yikes!

Any other suggestions anyone?

Thanks again,

Ron

From: Steve Gregory [mailto:[log in to unmask]]
Sent: Wednesday, July 23, 2014 2:42 PM
To: TechNet E-Mail Forum; Ron Feyereisen
Subject: Re: [TN] Hand Soldering Stacked SMT Components

Hi Ron,

Best thing to do is to print your board then place the components on the first layer, then before reflow dispense a dot of solder paste on each termination where you'll be doing your stacks, then hand place the stacked component then reflow everything. We did that all the time at a past employer. Takes a steady hand, but it's easier than hand soldering it and it's much better for the caps that way...they don't like 800-degree soldering irons that much.

Some people are better at this technique than others, I could do 0603's pretty easily, but we had some ladies that could do quadruple stacks with 0402's! No sh*t! Check it out:

http://stevezeva.homestead.com/files/Quad_Stack.JPG

Steve

On Wed, Jul 23, 2014 at 1:20 PM, Ron Feyereisen <[log in to unmask]<mailto:[log in to unmask]>> wrote:
Hi Technetters,

I'm looking for some sort of documented technique (if one exists) and advice on hand soldering stacked SMT components.
We're currently working on a production job that requires hand soldering a 0603 resistor on top of an already reflowed capacitor of the same size and we're experiencing some fallout with one side not being completely connected at the top of the stack with a full fillet. Inspection is having to inspect at 10x mag and it's slowing down throughput.

Any advice on improving our soldering techniques would be much appreciated!

Thanks,

Ron

Ron Feyereisen
Continuous Improvement Mgr., CIT


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