Electronics Forum: stencil (Page 242 of 540)

Solder bridging on IC leads

Electronics Forum | Mon Aug 23 03:12:57 EDT 2010 | grahamcooper22

Possible route causes of bridging on fine pitch ICs are; too much paste (stencil aperture wrong), poor print quality (paste smudges during printing), pcb pads not flat depending on the solderable coating, paste has poor cold slump properties, too muc

Solder bridging on IC leads

Electronics Forum | Mon Aug 23 14:09:56 EDT 2010 | davef

Similar to Coop's comments, above ... Bridging: * Mis-placement: misplaced components, high placement force mushrooms paste * Too much paste: HASL thickness, lead finish, poor underside support, poor underside wipe frequency, printing with too lar

Voiding in LGA (LT) soldering

Electronics Forum | Thu Sep 02 16:55:31 EDT 2010 | markgray

I ment LF318. We have a power supply board that has 3 different types of these LGA's and i have had great success with the reductions and stencil thickness mentioned. We had to go with 4 mil stencil due to the consideration of the other large compone

Solder Paste Printing to 0.005

Electronics Forum | Mon Dec 27 13:34:28 EST 2010 | ppcbs

Does anyone have any experience in printing solder paste on a 0.0065" pad? I have a requirement to attach single chips with 600 to 2400 connections. The chip has a 0.005" solder ball, 0.010 pitch. Attaching to a substrate with a 0.0065" pad. An

Looking for a Book/Guide for PCB assembly using SMT

Electronics Forum | Sun Jan 16 01:50:39 EST 2011 | leo83

Dear All, I am looking for a guide /book on PCB assembly using SMT(Middle range, not high speed) which i could use for selection of Machines. If their is any research report , i am ready to pay for it. Highly appreciate any inputs. Eg: What shoul

Stencil Washer Waste Disposal

Electronics Forum | Tue Mar 22 16:48:05 EDT 2011 | kmots15

We use an evaporator plumbed into the output of the stencil washer, it works great and reduces our Haz waste. You might need to get some form of permit first as this could be considered treating Haz waste in some areas, depends if you do Pb on your

Nano ProTek Coating

Electronics Forum | Fri Jul 22 13:17:49 EDT 2011 | ehughes

I would be careful with trying Rain-X. Rain-X is a silanol treatment that is not durable. That is why you need to reapply it on a windshield many times. Also you could contaminate the paste as it will come off the stencil during the printing. From

Stenciless Solder Print

Electronics Forum | Mon Jul 11 09:24:33 EDT 2011 | kahrpr

You need to check some other stencil places all the ones I deal with, Turn them around same day if I get the files early enough. Also i have a California stencil house which gives me 3 extra hours (east coast guy)I only pay extra for the shipping. Th

screen thickness

Electronics Forum | Mon Jan 23 22:53:31 EST 2012 | davef

= 0.66 aperture opening to the stencil wall has been shown to provide the best transfer efficiency and repeatability of the deposited paste. Values from 0.66 to 0.8 insure a good paste release from the stencil. The biggest impact on area ratio is the

screen thickness

Electronics Forum | Wed Jan 25 16:18:12 EST 2012 | wrongway

Your uising 6 mil thick screen on 0603 and sot-23 and you think you need more paste? when i use a 6 mil screen on a sot-23 and 0603 it is almost to much paste. 5 mill does just fine on those parts but if you think you need more paste then don't go t


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