Electronics Forum: 0.004 (Page 1 of 6)

MLF / QFN Lead Free Shorting

Electronics Forum | Mon Apr 09 14:53:19 EDT 2007 | flipit

Hi, We were running with few defects with lead solder paste. The lead solder paste with stencil 0.010" X 0.020" and 0.004" thick stencil produced near defect free PCB assys. 0.010" X 0.020" (0.004" thick) lead = defect free 0.010" X 0.020" (0.005"

Stencil thickness

Electronics Forum | Thu Mar 02 17:46:22 EST 2006 | Chris

Go with no greater than 0.005". Pleanty of paste and minimal shorting issues. 0.004" will even work

MLF / QFN Lead Free Shorting

Electronics Forum | Fri Apr 06 10:43:57 EDT 2007 | flipit

Hi, Anyone seeing difficulty is soldering MLFs or QFN with lead free solder? I have an MLF with 3 rows of pads on each of the 4 sides of the part and then the large center ground plane in the middle. The part is 20 mil pitch. Had good luck with l

Re: How to do with tombstoning for component '0402'

Electronics Forum | Thu Nov 02 17:15:34 EST 2000 | Erdem Bilaloglu

We are using semi-circular land pattern and 0.004" smaller appertures on screen. With stable rising slope (max:2.6degC/sec)we have not experienced any tombstonning so far.


Electronics Forum | Mon Jan 17 10:40:11 EST 2000 | Dave F

Cost = Labor + Production Materials + Overhead Cost = Labor * Overhead Multiplier Cost = (Time For Task*Labor Rate*Benefits) * Overhead Multiplier Cost = ((6sec/3600sec/hr)*$10/hr*1.3) * 2 Cost = $0.04

SMT Fuji MCS30

Electronics Forum | Tue Feb 22 18:57:52 EST 2022 | rdssmt

Hi, I bought a monitor and when connect it to the MCS30 this appears on the screen. I send a Photo but I write the information. 0 004 053 FDX $Dwwwwwwwwwwwqwwwwwwwwwwwwqwwwwwwwwwwwqwwwwwwwwwwqwwwwwwww%pqSSS$%@$D %$ JNNNNNNNNNNNNNNN NNnGGGGGGGGG

Gold thickness

Electronics Forum | Fri Jul 11 08:17:22 EDT 2008 | aj

Hi Dave, Yes that is correct. I had a XRF carried out on some boards that I am having solderability issues on and the report came back with 0.04um - 0.05um as the measured gold thickness. Previous batches that went through fine measured 0.07-0.11u

QFP Coplanarity & Alloy 42

Electronics Forum | Tue Sep 30 21:00:41 EDT 2003 | davef

We're not clear on what you seek. So, as a starting point for our discussion, we wouldn't get agitated if we saw "routine" coplanarity of 4 thou. For instance: Maximum Lead Coplanarity [Altera] Package||Acronym||Lead material||Finish||Maximum Lead

Solder Paste and fine pitch components

Electronics Forum | Wed Sep 18 18:48:33 EDT 2002 | davef

Fabs can produce a solder mask web between 20 pitch leads, but I've never seen a web for 16 pitch leads. Although, I would like know a supplier that can lay-down a fine web. Minimum solder mask web width is about 0.004 thou. An absolute mininum o

screen thickness

Electronics Forum | Tue Jan 24 20:00:39 EST 2012 | kahrpr

If you failed math like I did. A 0.005 inch stencil would work fine for those parts. Most stencils are 0.004in for fine pitch 1005s 201s. 0.005in is probably the most common generic stencil. 0.006in generally is if you need extra solder for big parts

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