NPRꢀNPS 2-T220ꢀT221
NHRꢀNHSꢀ2-T220ꢀT221
PowerꢀResistors
SPECIFICATIONS (continued)
Temperature Coefficient
100ppm/K
50ppm/K
7000
2000
-3000
-8000
-50
-25
0
25
50
75
100
125
Temperatureꢀ(°C)
Derating
PowerꢀRatingꢀNotesꢀ-
120
100
80
60
40
20
0
TheꢀNPRꢀ/ꢀNHRꢀSeriesꢀResistorsꢀmustꢀbeꢀattachedꢀtoꢀaꢀsuitableꢀ
heatsink.ꢀTheꢀmaximumꢀinternalꢀresistorꢀtemperatureꢀisꢀ155°C.
Toꢀspecifyꢀanꢀappropriateꢀheatsinkꢀuseꢀtheꢀfollowingꢀformulaꢀ:
RqHꢀ=ꢀTMAXꢀ-ꢀ(ꢀPꢀxꢀRqRꢀ)ꢀ-ꢀTA
ꢀꢀꢀꢀꢀꢀꢀꢀꢀP
Where:ꢀ RqHꢀ=ꢀThermalꢀResistanceꢀofꢀHeatsinkꢀ(ꢀK/Wꢀ)
ꢀ
ꢀ
ꢀ
ꢀ
RqRꢀ=ꢀThermalꢀResistanceꢀofꢀResistorꢀ(ꢀK/Wꢀ)
TMAXꢀ=ꢀMaximumꢀTemperatureꢀofꢀResistor
TAꢀ=ꢀAmbientꢀTemperatureꢀofꢀHeatsinkꢀ(ꢀ°Cꢀ)
Pꢀ=ꢀPowerꢀThroughꢀResistorꢀ(ꢀWꢀ)
25
50
85
100
115
130
145
155
Temperature of the backplate (°C)
Dimensions
NPSꢀ/ꢀNHSꢀ2-T220
tol.
tol.
Dimension
mm
12.70
10.16
0.76
(±mm)
inches
(±inches)
0.008
0.008
0.004
0.004
0.004
0.004
0.008
0.008
0.008
0.004
0.004
Dimension
mm
12.10
11.16
18.33
5.08
inches
0.476
0.439
0.722
0.200
0.069
0.126
A
B
C
D
E
F
G
H
I
0.2
0.2
0.1
0.1
0.1
0.1
0.2
0.2
0.2
0.1
0.1
0.50
0.40
0.03
0.20
0.16
0.05
0.57
0.59
0.68
0.02
0.07
A
B
C
D
E
F
5.08
4.00
1.76
1.20
3.20
14.60
15.00
17.33
0.40
J
K
1.85
Riedon Inc.ꢀ
ꢀ
ꢀ
300ꢀCypressꢀAvenueꢀ
ꢀ
ꢀ
AlhambraꢀCAꢀ91801ꢀ
www.riedon.com
ꢀ(626)ꢀ284-9901ꢀ
ꢀ(626)ꢀ284-1704
Pageꢀ81
ꢀ
ꢀ
ꢀ
ꢀ
rev.ꢀ03/2006A
RIEDON [ RIEDON POWERTRON ]
