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Re: [Amps] Need -- 300 ohm 50w noninductive resistor

Subject: Re: [Amps] Need -- 300 ohm 50w noninductive resistor
From: Bryan Swadener <>
Date: Thu, 21 Jul 2011 18:51:07 -0700 (PDT)
List-post: <">>
Before you buy into those TO-package resistors, take a look at the temperature 
derating on the datasheet.  MOST of that type are rated full power at only 
25C/77F.  The Bourns part mentioned is rated full power to 50C/122F... but MOST 
of that type aren't.  In my 1.6KW dummy load, I use actual RF resistors (4x 
Anaren RFP-400-50R), rated full power to 100C.  They never get that hot.

If you use the TO-package resistors, you should use significantly higher-rated 
parts AND heatsink them well.
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