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

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


Chris May

#9150

SOT-23's Stencil Geometry | 6 October, 1999

Hopefully, everybody suffers from solderability of SOT-23 devices and I would like to know how everybody else resolves this problem. Historically, here, we have always gone for 6 thou stencils. I found that going to an 8 thou stencil improved the situation drastically. I am also going to trial some SC59 packaged devices (meatier Japanese SOT-23 equivalents). Secondly, how much aperture reduction do people go for to achieve optimum results ? 2 thou overall ? 20% ?

Regards & thanks for popping by,

Chris.

reply »

#9151

Re: SOT-23's Stencil Geometry | 6 October, 1999

| Hopefully, everybody suffers from solderability of SOT-23 devices and I would like to know how everybody else resolves this problem. | Historically, here, we have always gone for 6 thou stencils. I found that going to an 8 thou stencil improved the situation drastically. | I am also going to trial some SC59 packaged devices (meatier Japanese SOT-23 equivalents). | Secondly, how much aperture reduction do people go for to achieve optimum results ? 2 thou overall ? 20% ? | | Regards & thanks for popping by, | | Chris. | High Chris, you might check your pad design cause we don�t have any problem with 6mil stencil + 15% reduction.

regards Wolfgang

reply »

jason gray

#9152

Re: SOT-23's Stencil Geometry | 7 October, 1999

| | Hopefully, everybody suffers from solderability of SOT-23 devices and I would like to know how everybody else resolves this problem. | | Historically, here, we have always gone for 6 thou stencils. I found that going to an 8 thou stencil improved the situation drastically. | | I am also going to trial some SC59 packaged devices (meatier Japanese SOT-23 equivalents). | | Secondly, how much aperture reduction do people go for to achieve optimum results ? 2 thou overall ? 20% ? | | | | Regards & thanks for popping by, | | | | Chris. | | | High Chris, | you might check your pad design cause we don�t have any problem with 6mil stencil + 15% reduction. | | regards Wolfgang | Typically, I've used either a 2 mil or 10% reduction on a 6-mil foil with great success.

reply »

PCB Soldering Tools

ii-feed SMD Intelligent Feeder