Electronics Forum: stencil (Page 214 of 540)

Re: uBGA's

Electronics Forum | Fri May 14 12:13:35 EDT 1999 | Heather

Hi Guys, I am going to be graced with the good luck of processing microBGA's in the near future. A bit of a step forward from printing 20-mil pitch and wave soldering 0805's, wouldn't you say? So, any of you folks who have already experi

Re: Squeegee Speed

Electronics Forum | Fri Feb 19 13:54:22 EST 1999 | Tuffty

Hey all- My question is this: My stencil printer operator has said that he has to wipe our 6-mil stencil each pass to get the paste in the 20-mill pitch aperatures for a QFP to release well. We are using Amtech NC-559 type 3 paste with

Re: uBGA Stencil Thickness

Electronics Forum | Tue Dec 22 14:29:08 EST 1998 | Earl Moon

I have a mixed technology board ranging from 50 mil pitch devices to 20mil Qfp's to PBGA-352 at 1.27mm, and 6 Intel uBGA-48 at 30 mil pitch. With all these different package types i'm torn between using a 4 or 5mil thick stencil. The ball dia. is

Re: Solder Paste Shape Standards

Electronics Forum | Sat Dec 12 12:03:59 EST 1998 | Dave F

DO you know of an Industry Standard that describes solder paste geometries requirements? Lyle: The industry standard that describes solder geometries requirement is IPC-A-610. There is no industry standard that describes how solder paste shoul

Re: polyimide stencils

Electronics Forum | Thu Apr 22 15:27:44 EDT 1999 | Hugh M

I keep hearing about polyimide stencils, but what are they like in terms of registration and aperture accuracy? You are hearing about polyimide as in polyimide film as Kapton (TM Dupont). This material is the stuff of flex and rigid/flex c

Re: Stenil printing adhesive

Electronics Forum | Wed Oct 14 13:52:59 EDT 1998 | Bill Schreiber

Dear Sanjay, An important issue involved when stencil printing adhesives vs. solder paste is: How do you clean the stencils after printing? Do you need two machines? Two chemistries? Two waste streams? What are the potential environmental impacts an

Re: Solder Wicking on CBGA?

Electronics Forum | Tue Aug 25 08:51:16 EDT 1998 | Justin Medernach

Hi, Does anyone has experiences in reflowing Ceramic BGA and found solder wicking ? Solder wicking has the syndrome that solder being wick from the pad and ended up in the leads. We have rule out the possibility of not printing any


Electronics Forum | Sun Aug 02 06:54:26 EDT 1998 | Bob Willis

You may liketo contact Chemtech in the UK. http://chemteck.co.uk as they have a new hand book on stencils and a design guide due for release shortly there is also some stencil information as a survey on types and price on my web sites under surveys h

Re: Solder Balls.........Blah

Electronics Forum | Wed Jun 24 16:45:18 EDT 1998 | Bill Schreiber

I know this topic has probably been talked about before...But I ran into a small situation where Solder Balls were appearing in large quantities on the PCB....the Problem has been isolated and taken care of, my question is, what are some good metho

Re: Plastic Stencils for screen printing ahesive

Electronics Forum | Wed Apr 08 05:41:37 EDT 1998 | Alan Pestell

We currently use the Loctite system of Glue/stencils and are getting very good results. You may still have a height problem is you solder resist is too thick. The UK sales person is Bob.goss@loctite-europe.com & he may give you more help. The only ot

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