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

[Bryan Swadener]

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.