KPR KPN 2/4-T227
KHR KHN  2/4-T227
Power Resistors
SPECIFICATIONS (continued)
Temperature Coefficient
100ppm/K
7000
50ppm/K
2000
-3000
-8000
-50
-25
0 25 50
Temperature (°C)
75
100
125
120
100
80
Derating
Power Rating Notes -
The KPR / KPN / KHR / KHN Series Resistors must be attached 
to a suitable heatsink. The maximum internal resistor tempera-
ture is 155°C.
To specify an appropriate heatsink use the following formula :
60
40
20
0
50
75
85 100 115 130
Temperature of the backplate (°C)
145
155
R q H  = T MAX  - ( P x R q R  ) - T A
          P
Where:  R q H  = Thermal Resistance of Heatsink ( K/W )
  R q R  = Thermal Resistance of Resistor ( K/W )
  T MAX  = Maximum Temperature of Resistor
  T A  = Ambient Temperature of Heatsink ( °C )
  P = Power Through Resistor ( W )
Pulse Stability
10kJ
3kJ
1kJ
300J
100J
30J
10J
3J
1J
0,3J
0,1J
Pulse time (s)
Riedon Inc.  
 
 
300 Cypress Avenue 
 
 
Alhambra CA 91801 
www.riedon.com
   
 
 (626) 284-9901 
 
 (626) 284-1704
Page 63
rev. 01/2011
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