## Electronics Forum: aspect ratio (Page 1 of 16)

### Re: aspect ratio for massive components on the solder side of double-sided reflowed PCBs

Electronics Forum | Thu Oct 19 16:10:44 EDT 2000 | John Thorup

Much has been said on this subject. Try a search of the archives for the terms "Phil Zarrow" and "surface tension". You'll likely find what you need.

### Re: aspect ratio for massive components on the solder side of double-sided reflowed PCBs

Electronics Forum | Thu Oct 19 16:10:48 EDT 2000 | John Thorup

Much has been said on this subject. Try a search of the archives for the terms "Phil Zarrow" and "surface tension". You'll likely find what you need.

### aspect ratio for massive components on the solder side of double-sided reflowed PCBs

Electronics Forum | Thu Oct 19 12:34:36 EDT 2000 | lwatson

I can't seem to find an article about the limiting mass of a SMT component on the solderside of a double-sided reflowed PCB. I'm pretty sure that Phil Zarrow did an article on this subject. It went something like the mass/land surface area?

### Stencil Aperture Aspect Ratio

Electronics Forum | Tue Jun 17 02:08:53 EDT 2003 | Bruce

What is the correct formula for Aspect Ratio? Thanks

### QUESTION: WHAT IS VIA ASPECT RATIO?

Electronics Forum | Thu Jul 16 10:40:12 EDT 2015 | migliore

Hi, Question 1: can anyone explain me what the VIA ASPECT RATIO is? Question 2: Let's say that a PCB manufacturer specifies a VIA ASPECT RATIO of 8:1. Can I have vias of drill diameter of 0.1 mm on a 2L board 1.6 thick? thanks, Enrico Migliore

### Solder Ball Aspect Ratio

Electronics Forum | Wed Aug 19 19:16:43 EDT 1998 | Steve

How is the aspect ratio of a reliable BGA joint defined? Is it best to have H/W between two limits? What are these?

### Re: Solder Ball Aspect Ratio

Electronics Forum | Fri Aug 21 15:03:42 EDT 1998 | Dave F

| How is the aspect ratio of a reliable BGA joint defined? Is it best to have H/W between two limits? What are these? Steve: People on TechNet have spent alot of time talking about BGA pad design. Use the link below. Dave

### High Aspect Ratio Via Fills

Electronics Forum | Fri Apr 05 11:18:20 EST 2002 | habs24

Anyone have experience using Dupont CB100 for high aspect ratio via fills? Or even where I could get more information on the processes involved? Thanks in advance...

### Printing for 0402

Electronics Forum | Mon Oct 27 14:06:10 EST 2003 | russ

Search the archives, plug in 0402 OR aspect ratio and you will find everything you need to know about area and aspect ratio. These are the critical formulas for paste release. Russ

### Stencil Aperture Aspect Ratio

Electronics Forum | Tue Jun 17 08:52:39 EDT 2003 | russ

Aspect ratio = width of aperture divided by height. E.G. 6 mil stencil at 9 mil wide = aspect ratio of 1.5. Value should be 1.5 min. Area ratio - use when length and width of pad are roughly same dimension like for BGAs and 0805 and smaller R-nets

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