Electronics Forum: bottom (Page 5 of 227)

Epoxy on bottom of SMT component

Electronics Forum | Mon Nov 26 20:11:41 EST 2007 | shy

Yes, i'm agree with you davef but i'm not put the chipbonders onto pads. i'm put the chipbonders at the beneath component (center between both component terminals) which the idea is to hold the component during wave soldering which might cause the co

Epoxy on bottom of SMT component

Electronics Forum | Mon Nov 26 22:05:34 EST 2007 | shy

currently i'm open my stencil aperture is 80% from the land pattern. is this will cause insufficient solder at the terminal component or not? the stencil thichness is 6mil and the board run using SMT pallet which i consider there will be no option f

Epoxy on bottom of SMT component

Electronics Forum | Tue Nov 27 20:48:31 EST 2007 | davef

Shy: You say, "I've already done some evaluation to reduce the heigh of the glue but it fails at wave solder which cause the component to be drop/missing." Based on your evaluation, questions are: * What is the relation between component standoff an

Epoxy on bottom of SMT component

Electronics Forum | Thu Nov 29 22:31:27 EST 2007 | shy

Hi Stephen, The component falling off is the component that had glue. the component witout glue is being covered by masking during wave. What is the meaning by populated the part and cure it? is it run with solder paste profile or glue profile or yo

Epoxy on bottom of SMT component

Electronics Forum | Fri Nov 23 16:09:01 EST 2007 | davef

We're not real clear about what you're trying to discuss, because most capacitors are packaged in epoxy with a solderable termination on each end. But lets throw a couple of ideas at the wall and see what sticks. If this epoxy is: * From the capaci

Epoxy on bottom of SMT component

Electronics Forum | Wed Nov 28 01:07:36 EST 2007 | shy

is there any standard gap between the terminal and pad if we place the glue? SMT-4 mention as per what you understand which is using glue at SMT without solder paste and run at wave solder for the solder paste at the terminal. Glue supplier recomm

Epoxy on bottom of SMT component

Electronics Forum | Thu Nov 29 22:38:05 EST 2007 | shy

Hi Dback, Yes, i'm open "dog bone" aperture for my chip component. this is to prevent solder ball issue. For fine pitch i'm opening square with full length and half width to prevent bridging. Btw, if "dog bone" is not for chip component, what is your

Epoxy on bottom of SMT component

Electronics Forum | Fri Nov 30 08:53:17 EST 2007 | jaimebc

Shy, Our 5 and 6 mils stencils have home plate apertures and reduced by 10% and using SMT adhesive. Never had a problem with components non wetting like you have. I do believe that you are not screening enough paste, something about the dog bone ape

Epoxy on bottom of SMT component

Electronics Forum | Mon Dec 03 10:47:11 EST 2007 | slthomas

I thought you said that the parts that weren't wetting in reflow were the parts with epoxy. The question I have is do they wet in wave solder, and if they do, why does it matter what happens to them in reflow? Conversely, if they don't wet in wave,

Epoxy on bottom of SMT component

Electronics Forum | Tue Nov 27 08:13:04 EST 2007 | davef

C1: is there any gap between the pad and terminal if we place the glue? R1: Yes, there is a gap, but it is easily bridged by the amount of solder in the wave. C2: Btw, my practice to print solder pate then punch glue then PNP component and finally


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