Electronics Forum: balanced (Page 13 of 41)

Insufficient Heel Fillets on plastic 240 pin QFPs

Electronics Forum | Thu Mar 22 15:44:50 EST 2001 | pteerink

I have a board with QFP240 plastic package exhibiting the same characteristics. Minimum heel fillet that doesn't change with stencil mods, paste change, profile change etc ( I am working to class 2, though, so my pass spec, although they are not pret

Insufficient Heel Fillets on plastic 240 pin QFPs

Electronics Forum | Thu Mar 22 15:45:20 EST 2001 | pteerink

I have a board with QFP240 plastic package exhibiting the same characteristics. Minimum heel fillet that doesn't change with stencil mods, paste change, profile change etc ( I am working to class 2, though, so mine pass spec, although they are not pr

Insufficient Heel Fillets on plastic 240 pin QFPs

Electronics Forum | Mon Mar 26 20:55:16 EST 2001 | davef

Two things: 1 IPC pad calculator is an excellent resource for you and your board layout staff. Consider that working together with the calculator may allow you both an opportunity to balance your interests. 2 It's unlikely that the ceramic parts h

PCB Acceptance Standards

Electronics Forum | Wed Apr 04 08:57:13 EDT 2001 | Cal

IPC-TM-650 is a works well. Ionic conductivity is a good rule of thumb but I prefer ION Chromatography this will help determine the residues left behind from the fab process. There are a bunch of ways to determine solderabiltiy- Wet Balance and SERA

When? How and What??

Electronics Forum | Tue Aug 22 10:06:53 EDT 2000 | George English

Has there been a definite date for the total move over to lead free? Will it be 2004 or 2008. Also is there a direct replacement for leaded solder, I have read various articles on numerous alloys suggested for the switch, such as bismuth, tin, copper

How to calculate the ROI

Electronics Forum | Tue Jun 26 12:39:08 EDT 2001 | danial

Our mother company shipped to us a lot of old datecode material and upon running them in the line we experienced non-wetting condition, esplly on the 0402 ( not tombstone ) We have run a dip-and-look test but I guess the method is very subjective as

solder balls

Electronics Forum | Thu Jul 12 20:50:37 EDT 2001 | davef

One possible reason no one brought-up "too much paste" is that suggestion has been proffered so many times that it�s in the archives like the layers of sediment making-up Kataden. Another thing [we can argue about this], using home plate apertures w

Juki2000 vs YamahaYV100 or 88

Electronics Forum | Fri Jul 27 21:17:10 EDT 2001 | Mike Kennedy

We are looking at another pick&place machine for our production line and are leaning towards the Juki2000 series and the YamahaYV series machines. I would like any feedback from those in the industry who have used either of these machines. Also we cu

Looking for input on Heller 1900WN reflow ovens

Electronics Forum | Wed Jan 05 14:21:27 EST 2000 | Glenn Burson

I have the opportunity to pick up a used 1998 Heller 1900WN reflow. I have no experience working with Heller reflows, nor have I heard much about them, so I don't know if they are good quality machines or not. I have concerns about issues such as z

Strange S-20

Electronics Forum | Wed Nov 03 03:26:38 EST 1999 | Wes

We have Siemens S-20 machine whose other gantry occasionally missmounts all its components in Y-direction(approx. 1/2 mm ). Most of the missmounts happens when there is a lot of 0603 or 0805s (B-side glue boards). Gantry picks up the components OK bu


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