Electronics Forum: mils (Page 1 of 198)

Stencil for 10 mils IC

Electronics Forum | Sun Nov 12 21:28:09 EST 2000 | Rchard Eigner

We are manufacturing a PCB that uses an integrated circuit that has a leg spacing of 10 mils, other components on the PCB are 1206's and 0805's. Is it possible to make the stencil apertures 10 mils apart or is there another way of making the stencil.

Re: Stencil for 10 mils IC

Electronics Forum | Mon Nov 13 04:57:27 EST 2000 | Wolfgang Busko

Hi Richard, I assume that you deal with a component that has 20mil pitch. In this case depending on your pad design you get from 8 to 10mil spacing for your apertures. With a slight reduction of the aperture (10 to 15% for avoiding shorts)and a 6mil

Re: Stencil for 10 mils IC

Electronics Forum | Wed Nov 15 11:00:35 EST 2000 | Finepitch Services

"depending on your pad design"... To me, Wolfgang gave you the biggest secret... I guess he meant the real pad width you get on your board is the start point. Get the average measurement in mils and then cut it from the sides at the percentages he h

Re: Stencil for 10 mils IC

Electronics Forum | Mon Nov 13 08:24:03 EST 2000 | G. English

Richard, From your description of the IC, as Wolfgang indicates it sounds like a 20mil pitch device, the aperture design really depends upon your solder paste particle size, we use a type 3 solder paste with a mesh size of �325 / +500microns. This is

Re: Stencil for 10 mils IC

Electronics Forum | Mon Nov 13 16:24:49 EST 2000 | Darby

Depending on the designers pad size, I generally go for 0.010" aperture with 0.010" spacing - stencil thickness 0.005". This combo with metal squeegees and the "usual suspects" of printer set up and placement details should you you hassle free.

Why 50 mils in 0805 package instead of 40 mils.

Electronics Forum | Fri Oct 03 05:50:53 EDT 2003 | kanwal324

All the packages like 0603,0402,0201 have half the width as compared to length but in case of 0805 package width is 50 mils instead of 40 mils. Is there any special reason designing point of view. Please tell if anybody knows.

Why 50 mils in 0805 package instead of 40 mils.

Electronics Forum | Fri Oct 10 19:24:53 EDT 2003 | MA/NY DDave

Hi SMTAnet, SMTnet, You already got good answers for how to go forward. I believe that this 50mils is a remnant of the days when we started at 125 mil grids and started the process of going down to 100mil grids, SMT. My gosh who would ever want a 1

Why 50 mils in 0805 package instead of 40 mils.

Electronics Forum | Mon Oct 06 04:03:39 EDT 2003 | iman

Does the EIA standard recommend any standard PCB pad sizes (LxB)? and pitch-to-pitch (Pad) distances? Thanks for the advise.

Why 50 mils in 0805 package instead of 40 mils.

Electronics Forum | Tue Oct 07 09:41:53 EDT 2003 | davef

If don't want to be distracted by those things, why not just use the pattern calculator on the IPC site?

Why 50 mils in 0805 package instead of 40 mils.

Electronics Forum | Mon Oct 06 22:51:53 EDT 2003 | iman

Yo! thanks! for the link, too bad it costs USD$1K+ for single site license fee. IPC's specs are great for customer level discussions, but its guys like 'smtplus' who help get the warzone DFM into action, coz its guys like us who need to do the groun

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