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RE: Potential heating problem with standard patch Cat5 panels




What is the worst case of the two cases:

Case 1: PC board trace with 0.07W/inch generating 12C rise
Case 2: 0.07W dissipated on 0805 SMT resistor rated to 125mW and its area is
8mils x 5 mils.

I know that case  2 is being used without failure reporting. Since in case 2
the power density/area is much higher than case 1, it seems that it is not a
real problem.

What others think about it?

Yair.

 

> -----Original Message-----
> From:	Jack Andresen [SMTP:jandresen@xxxxxxxxxx]
> Sent:	ה, מאי 03, 2001 11:21 PM
> To:	stds-802-3-pwrviamdi@xxxxxxxx
> Subject:	Potential heating problem with standard patch Cat5 panels
> 
> A customer mentioned  panels burning up when one of his customers senr
> power down the network.. I did some canculations and found a potential
> problem. 
> 
> Jack Andresen << File: DTE power.doc >>