Should be 2.3 W for 1 S, having trouble reading log - log graphs -Blair

On Thu, 2 Dec 2010 14:38:41 -0600, Blair Hogg <[log in to unmask]> 
wrote:

>This is a little off the normal Technet topic genre, but I was wondering if 
>anyone out there may have some data on how long a resistor can withstand 
>overcurrent before it changes resistance / fuses open? I'm taling about a 
>standard 0805 carbon film resistor, for example 100 ohms:
>
>at 1 mA it drops 100 mV and dissipates 100 uW, no big deal for a 125 mW 
>device
>
>at 10 mA it drops 1 V and dissipates 10 mW, still no big deal
>
>at 100 mA it drops 10 V and dissipates 1 W, until the resistance increases 
>dramatically
>
>How much of a time duration can the device withstand at 100 mA? Is there a 
>correlation between overload and time?
>
>The graph in http://www.koaspeer.com/pdfs/Thick_Film_Pulse_Limitation.pdf 
>seems to indicate that an 0805 (2A on the graph) can dissipate 1.5 W for 1 
>second. Does this make sense?
>
>Thanks,
>
>Blair
>

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