Electronics Forum: disocolored leads of sot23 after reflow (Page 1 of 2)

Wetting problem of PCB after reflow soldering

Electronics Forum | Fri Sep 14 02:18:32 EDT 2001 | gsparka

Hi. After reflow soldering. There are lots of non wetting of leads. 71 b'd all are mounted resister,condensor,qfp,plcc,bga have got the defects so many. all defecs occured in the fine pitch ic. others are good. On some fine pitch pads not mou

Low tensile strenght of SMD

Electronics Forum | Tue Jul 18 05:39:25 EDT 2006 | rocko

Hello all, After lead-free reflow process of single side assembled PCB I have a problem with a tensile strenght of SMT transformers - I can rip the parts from the board very easily. There is very good component leads wetting (optical inspection)

Assemby of flexible printed circuits

Electronics Forum | Wed May 16 15:40:56 EDT 2012 | davef

Here's some notes from a Bob Willis presentation Assembly of Flexible Circuits with Lead-Free Solder Alloy [Bob Willis leadfreesoldering.com] * Flexible Circuit Construction ** Base Material - 0.05mm Copper 18/18 um ESPANEX from Holders Technologies

Life of a Solder Stencil

Electronics Forum | Tue May 29 16:52:07 EDT 2001 | hussman

By far the easiest way is to track solder paste measurement on your board - or solder defects after reflow (key word- easiest). Why spend 2 weeks examining a stencil when it clearly doesn't make defects, or IS making defects. I find using 2-D data

Re: IC leg of RF unit lifted..

Electronics Forum | Thu Jun 29 11:08:55 EDT 2000 | Dave F

Kok Han: Good to hear from you. Please help us understand you situation better by talking more about: � Component IC of the RF unit (IC101). For instance: SMT / PTH, package, pitch, lead material, lead finish, package type, package weight, coplan

About the optimum temperature of IC repair

Electronics Forum | Tue Sep 11 12:45:01 EDT 2007 | rgduval

Both questions will depend upon the IC specifications. Check the manufacturers recommendations for temperature specification, as well as reflow profiling. As a general rule, we don't like to rework a component more than 2 times after initial reflow

Part of PCB silkscreen turns yellow brownish

Electronics Forum | Thu Aug 28 23:15:44 EDT 2014 | phyllishwl

Hi all, Our production reported that they found 3 panels out of 53 panels with strange phenomenon after reflow. 1/ Blister / Delamination of PCB panels, 2pcs blister/delamination under solder mask, 1pc under Gold plating at Gold finger 2/ Silkscr

Which side of PCB should be prefered for screening...

Electronics Forum | Tue Sep 18 16:48:55 EDT 2001 | jschake

Why do you think that assembling the BGA, QFP, and fine pitch parts will solve your bridging problem? I would think doing this may cause you more grief by having these more massive components being reflowed upside down fall off during the second pas

Re: Use of solder paste for leaded thru hole parts????

Electronics Forum | Fri Jul 10 14:23:23 EDT 1998 | Bob Willis

You can get a report and CD ROM on pin in hole reflow assembly from the SMTA main office in the USA. They also have a new report on Double Sided Reflow Design and Assembly. | Hi all . | Thanks to Ryan, Brian , Justin and Dave for the timely help ear

Use of solder paste for leaded thru hole parts????

Electronics Forum | Tue Jun 30 12:48:59 EDT 1998 | Upinder Singh

Hi all . Thanks to Ryan, Brian , Justin and Dave for the timely help earlier. I would appreciate if somebody could help me in the stated issue: I am trying to to place one thru hole 20 pin connector along with the SMT components by paste printing an

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