Re: [SI-LIST] : Recommendations for High Density PCB to PCB Connection

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From: Mike Ventham (ventham@quantic-emc.com)
Date: Thu Nov 04 1999 - 07:40:28 PST


Laurence,

I still think you are having calculation problems.
Your answer was correct but

1 sq inch = 1000 mils * 1000 mils = 1000000 sq mil. NOT 10000 sq mil

From this
1 sq inch = 25.4 mm * 25.4mm = 645.16 sq mm
0.0025 sq inch = 1.61 sq mm. which matches your answer.

Laurence Michaels wrote:
>
( deleted)
> Argh... I was asleep when I did that calculation. Time to check
> everything else I did yesterday :-)
>
> 0.2*0.5=0.1 square inch.
> 0.1/40=0.0025 square inches per connection
>
> (calculation error was probably here... 0.0025 square inches does
> NOT equal 2.5 square mils... that's what I get for using non-metric
> units, and only turning on half of my conversion algorithms.
> 1 sq in = 10000 sq mil 1 sq meter = 1000000 sq mm)
>
> 0.0025 square inches gives 1.6 sq mm per connection
> 25 square mils gives 1.6 sq mm per connection
>
> I'm not usually that stupid. (I hope)
>
> Thanks,
> --
> Laurence Michaels
>
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-- 
Regards

Mike ________________________________________________________________ | Mike Ventham - Vice-President Engineering, | | Quantic EMC Inc Headquarters | | Croft House, Chilcompton, 191 Lombard Ave, Winnipeg, | | Somerset, UK, BA3 4JA Manitoba, Canada R3B 0X1 | | Tel: 44 (0)1761 232191 Tel: (204) 942 4000 | | Fax: 44 (0)1761 233549 Fax: (204) 957 1158 | | Email: ventham@quantic-emc.com http://www.quantic-emc.com |

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