Electronics Forum: 20mil (Page 1 of 37)

0402 chip resistor - settled sideway after reflow

Electronics Forum | Sun Apr 15 23:12:00 EDT 2001 | Eric Chua

The size i had changed from 55 x 20 mils to 42 x 20 mils. The component size i have is 40 x 20 mils ( 1mm x 0.5mm ).

Re: 20 mil qfp bridging

Electronics Forum | Fri Aug 13 12:52:17 EDT 1999 | Steve Schrader

Hello Having a problem with bridging on 20mil pitch qfp, only on the lead groups where squeegee goes over width of apertures. Using MPM sp-200 semi-auto, chem-etch stencil, 9-10mil width opening 100 durometer blade. Getting "tails" on deposi

Re: Step down stencils using CBGA and 20 mil QFP's

Electronics Forum | Fri Oct 22 06:19:42 EDT 1999 | TNT

Ron, if I am reading this correctly the 20mil parts are not having problems on a 6mil stencil. If you increase the entire thickness of the stencil to 8mils, there should not be any issues with the 20mil components. The supports you are using could p

QFP Coplanarity Error

Electronics Forum | Wed Mar 10 08:20:00 EST 2010 | aajmera

I am sorry, they are fine-pitch QFPs (20 mils)

20 mil qfp bridging

Electronics Forum | Thu Aug 12 18:43:49 EDT 1999 | Wayne S.

Hello Having a problem with bridging on 20mil pitch qfp, only on the lead groups where squeegee goes over width of apertures. Using MPM sp-200 semi-auto, chem-etch stencil, 9-10mil width opening 100 durometer blade. Getting "tails" on deposits. Trie

Re: 20 mil qfp bridging

Electronics Forum | Thu Aug 12 20:17:12 EDT 1999 | Kelly Morris

Hello Having a problem with bridging on 20mil pitch qfp, only on the lead groups where squeegee goes over width of apertures. Using MPM sp-200 semi-auto, chem-etch stencil, 9-10mil width opening 100 durometer blade. Getting "tails" on deposi

20 mil pitch applications

Electronics Forum | Fri Jan 08 16:31:05 EST 1999 | Jason Tomlinson

Our company is beginning to delve into some 20 mil applications and I'm curious to hear what kind of success others have had placing these components. What kind of fall out rates we might expect or any specific difficulties encountered and what acti

Re: Squeegee Speed

Electronics Forum | Tue Feb 23 09:51:35 EST 1999 | Steve Schrader

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

Step down stencils using CBGA and 20 mil QFP's

Electronics Forum | Thu Oct 21 14:02:32 EDT 1999 | Ron Costa

We are a contract manufacturer currently building a job with IBM CBGA-255 devices and 20mil QFP's that are close to each other. We use a 6 mil laser cut and electro polished stencil with one to one apertures on the BGA's. The customer is experiencing

Cpk Variables Control for Paste Printing

Electronics Forum | Tue Mar 19 00:14:47 EST 2002 | ianchan

Hi Guys, Can anyone help us out here, please? We need to know what formulae (other than Length(L)xBreath(B)xheight(Z)), is used to determine what volume of paste is required for 20mils pitch leadless chip carrier (LCC28), for the paste printing pro

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