Electronics Forum: (4) (Page 89 of 631)

component aherence force on the solder paste before reflow

Electronics Forum | Mon Jul 02 09:28:24 EDT 2001 | blnorman

You can test for solder paste tack using IPC-TM-650 method 2.4.44. This will give you an idea of the adhesive strength of your paste prior to reflow.

0402 placement skew

Electronics Forum | Mon Jul 09 20:46:22 EDT 2001 | davef

Is the glue intended for printed SMD attach? 3 Are you following all the manufacturer�s glue shelf life recommendations? 4 Are you observing all the manufacturer�s glue working life guidelines? Finally, what level of skewing are we talking about?

Thermally Conductive Epoxy

Electronics Forum | Wed Aug 01 20:21:34 EDT 2001 | davef

0.4 W/m�C [er sumpin like thet]. But it's real brittle. Sofer rework, ya can just pop that sucker [component to be replaced] right arf.

Re: Anti-solder finishing

Electronics Forum | Mon Feb 07 13:26:14 EST 2000 | Dave F

Spacerwoman: Carol is a professional spacer problem fighter (we think). When people have problems with spacers, they call on SPACERWOMAN!!!!! Here she is to save the day � ;-) Selecting a spacer made of brass is a good choice for many applicatio

Beat rate

Electronics Forum | Fri Feb 04 15:45:36 EST 2000 | jseagle

For a single board that takes 5 minutes to build on my machine, is it better to do it as a single board or a 4 up panalized board that will take 20 minutes to build? And why?

Thermal excursion

Electronics Forum | Tue Feb 01 10:49:39 EST 2000 | AF Ng

Could someone help to let me know which Standards ( IPC or others) which spell the number of thermal excursion that FR4 boards is allowed to exposed to ? Thank you

Re: Thermal excursion

Electronics Forum | Thu Feb 03 10:22:23 EST 2000 | AF ng

Dear Dave, Thank you for your reply. What I meant thermal excursion is the solder cycle. That is for the same particular point, how many time we can solder them, for FR4 boards. Thank you

Re: SMT Chip terminal lifted

Electronics Forum | Wed Jan 19 11:52:34 EST 2000 | Dave F

PC and Erico: Are yinns talking: 1 A component that will not lie flat on the board? 2 A component that will lie flat to the board that you can't get to solder to the pad? 3 A pad that is no longer attached to the board? 4 Something else. Whazit?

Dummy Flip Chips - Supplier Needed

Electronics Forum | Tue Dec 21 10:27:12 EST 1999 | Aaron Unterborn

Looking for mechanical chips (daisy-chained / stiched) for flip chip (C4) testing. Any contacts or suppliers? Thanks.

Re: smt on flexible board

Electronics Forum | Mon Dec 20 19:09:54 EST 1999 | Chris

If your flex circuit is only populated on one side, you can have the PCB vendor palletize the flex for you. What you do is have the flex circuit laminated to 062" FR4 using a thermoset adhesive like Dupont WA. Standard flex circuit adhesive. Howev


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