Electronics Forum | Thu Jun 14 06:13:47 EDT 2012 | ccgooi
I am running a product with board size ~18"X16". I faced stencil aperture positional accuracy issue which slightly shifted at both end of stencil at positive and negative in X direction thus causing solder paste to pad mis-registration. Due to this s
Electronics Forum | Thu Mar 06 10:57:28 EST 2003 | Mark
What are the recommended stencil apertures for a TSOP40. Lead pitch 0.48mm & lead width 0.21mm. And direction of squeegee print over the aperture? Recommended Stencil thickness? Recommended aperture reductions? Recommended pcb pad sizes? Recommended
Electronics Forum | Tue Mar 11 09:33:06 EST 2003 | davef
I'm wrong about the MPM AP. I got my model designation crossed-up and was thinking of an older unit. I apologize to MPM for for my unfair criticism of their product.
Electronics Forum | Fri Mar 07 21:02:21 EST 2003 | neil
When printing below .5mm pitch, the recommended stencil thickness is 5Thou, laser cut. Do not use any reduction and ensure wherever possible the pad to space ration is 1:1, the length of the pad is not as important as the gap between adjacent pads. T
Electronics Forum | Sat Mar 08 11:04:47 EST 2003 | Joe
Mark, You've already received some good advice from the other posters. The one thing I would add is that even if you solve your printing issues on this type of part, the relative small quantity of paste may be prone to soldering problems. Ever s
Electronics Forum | Fri Mar 07 14:09:16 EST 2003 | davef
Q1: What are the recommended stencil apertures for a TSOP40. Lead pitch 0.48mm & lead width 0.21mm. A1: We've talked about this previously here on SMTnet, for instance check the fine SMTnet Archives: http://www.smtnet.com//forums/index.cfm?fuseactio
Electronics Forum | Thu Jun 29 09:12:27 EDT 2000 | sree
What is the best aperture opening for micrBGA with 0.8 mm ball pitch and 16 mils ball diameter?The pad size on the PCB is 12 mils.
Electronics Forum | Fri Jan 17 15:36:23 EST 2003 | davef
How do 0.5 mm pads on the board help paste release from the stencil? Paste release from the stencil is a function of: * Paste * Printer operation * Stencil design You have no obligation to made your stencil apertures the same size as the pads on yo
Electronics Forum | Thu Jun 29 11:52:23 EDT 2000 | JAX
sree, There is no Definite. You have to make the call. If you think the previous info was on target, use the info provided to find out the appropriate percentage relation between ball diameter, pad diameter, and aperture size. If you already run BGA,
Electronics Forum | Thu Jun 29 09:46:41 EDT 2000 | sree
Hi Jax, The microbga discussed earlier in the forum is mounted on 16 mils pad whereas mine is on 12 mils pad. Can I use the same aperture opening ?Please advise.
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