NPR2-T220 Datasheet, PDF (2/3 Pages) Riedon Powertron – Power Resistors

NPR NPS 2-T220 T221
NHR NHS 2-T220 T221
Power Resistors
SPECIFICATIONS (continued)
Temperature Coefficient
7000
2000
100ppm/K
50ppm/K
-3000
120
100
80
60
40
20
0
25
-8000
-50 -25
0
25
50
75
Temperature (°C)
100 125
Derating _{Power Rating Notes -}
The NPR / NHR Series Resistors must be attached to a suitable
heatsink. The maximum internal resistor temperature is 155°C.
To specify an appropriate heatsink use the following formula :
R_qH = T_MAX - ( P x R_qR ) - T_A
P
50 85 100 115 130 145 155
Temperature of the backplate (°C)
Where:
R_qH = Thermal Resistance of Heatsink ( K/W )
R_qR = Thermal Resistance of Resistor ( K/W )
T_MAX = Maximum Temperature of Resistor
T_A = Ambient Temperature of Heatsink ( °C )
P = Power Through Resistor ( W )
Dimensions
NPS / NHS 2-T220
Dimension
A
B
C
D
E
F
G
H
I
J
K
mm
12.70
10.16
0.76
5.08
4.00
1.20
14.60
15.00
17.33
0.40
1.85
tol.
(±mm)
0.2
0.2
0.1
0.1
0.1
0.1
0.2
0.2
0.2
0.1
0.1
inches
0.50
0.40
0.03
0.20
0.16
0.05
0.57
0.59
0.68
0.02
0.07
tol.
(±inches)
0.008
0.008
0.004
0.004
0.004
0.004
0.008
0.008
0.008
0.004
0.004
Dimension
A
B
C
D
E
F
mm
12.10
11.16
18.33
5.08
1.76
3.20
inches
0.476
0.439
0.722
0.200
0.069
0.126
Riedon Inc.
300 Cypress Avenue
Alhambra CA 91801
[phone]
[phone]
www.riedon.com
Page 81
rev. 03/2006A