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continuous power dissipation of worewound resistor

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grizedale

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Hello,

The MVM5 family of wirewound resistors is rated at 5W.....however, the temperature de-rating chart does not say how much PCB copper area the resistor has to be soldered to in order to be able to achieve that power rating continuously.

..do you know how much PCB copper area is required for the MVM5?


**broken link removed**
 

I don't see the relevance of the track area with the power rating of the resistor, this is a vertical mounted resistor that dissipates heat through its case , it don't depend on the track area, only on the ambient temperature.

Alex
 

Yes, only a negletable power dissipation share is conducted through terminal wires. Copper tracks of sufficient width can be helpful to prevent the resistor from desoldering itself.
 

FvM said:
Yes, only a negletable power dissipation share is conducted through terminal wires. Copper tracks of sufficient width can be helpful to prevent the resistor from desoldering itself.
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Good point, and this shouldn't be overlooked, since many power resistors can actually tolerate operating temperatures above the melting point of solder!
 

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