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

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


Glue a SOT223?

Hussman

#2247

Glue a SOT223? | 8 December, 2000

Can it be done? If so, what pattern to use? I plan to screen print the adhesive.

Thanks in advance!

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#2248

Re: Glue a SOT223? | 11 December, 2000

Sure you can do it!!! Just so that I'm clear on your inquiry, the pattern you're talking about is what? * Foot print of the copper pads * Glue pattern for printing your adhesive

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Hussman

#2249

Re: Glue a SOT223? | 12 December, 2000

Glue patter for printing adhesive. I was going to use a bar as wide as the part.

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#2250

Re: Glue a SOT223? | 12 December, 2000

Your line is fine. We do three dots in a line between the leads.

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Verm

#2251

Re: Glue a SOT223? | 13 December, 2000

Dave, what are the diameters of the adhesive dots?

George

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#2252

Re: Glue a SOT223? | 13 December, 2000

George

We use a 0.030" dot.

Here's a link for aperture sizes for adhesive printing from Alpha. http://www.alphametals.com/products/techarticles/soldrpstncl/guidelines.html

Here's a link for aperture sizes for adhesive printing from Heraeus. http://www.4smt.com/smt/hcmd_smt1.htm

Call your Loctite rep and see what they're doing with it these days. http://www.chemical.felpro.com/electronics/tp_multipoint.html http://www.loctite-europe.com/wwdh/us/i183ch11.htm http://www.loctite-europe.com/eu/PDF/Brochures/asei-VARIDOT.pdf

Finally consider ... 7525 - Stencil Design Guidelines. This new document provides guides for the design and fabrication of stencils for solder paste and surface-mount ADHESIVE. This is the first time this important information has been collected and published in an industry consensus document. Stencil design for various surface-mount technology , as well as mixed technology with through-hole or flip chip components is discussed; this includes overprint, two-print and step stencil designs. A sample order form and a user inspection checklist are also included. 20 pages. Released May 2000.

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