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 NPR NPS 2-T220 T221 NHR NHS 2-T220 T221
PowerResistors * * * * * * * Resistances from 0.02Ohm to 100kOhms Power Rating to 50Watt Resistance Tolerances to 1% TCR to 50ppm/K Load Stability to 0.5% TO-220 Housing Convenient SMD D2Pak Available
SPECIFICATIONS
Type
ResistanceRange Powerrating freeair70C withheatsink ThermalResistanceRthj-c Tolerances from0.02Ohms from1.0Ohms Stability Temperature Coefficient 0.02to0.049Ohms 0.05to0.099Ohms 0.1Ohmsto100kOhms VoltageProof Max.Voltage dependingonresistancevalue 2.0kVDC 2%/5% 1%/2%/5% 0.5% 600ppm/K 300ppm/K 100ppm/K uponrequest50ppm/K 1.5kVDC
NPR / NPS
0.02Ohmsto100kOhms 1.5W 30W 3.5K/W
NHR / NHS
0.02Ohmsto15kOhms 1.5W 50W 2.1K/W
10000
max. working voltage (VDC)
1000
100
10
1 2 Ohm
OperatingTemperatureRange ResistorMaterial Substrate Housing ConnectorMaterial Terminals Max.Torque
10 Ohm
100 Ohm
1 kOhm
5 kOhm
10 kOhm 100 kOhm
-40to155C ThickFilm Al2O3 EpoxyorPPS Cutinned 2 T220:1Nm T221:0.8Nm
Ordering Information
PartNumber-Resistance-Contact-Tolerance NHR2-T221C1.1kOhms1%
Riedon Inc. 300CypressAvenue AlhambraCA91801 www.riedon.com (626)284-9901 (626)284-1704 Page80
rev.03/2006A
NPRNPS 2-T220T221 NHRNHS2-T220T221
PowerResistors SPECIFICATIONS (continued) Temperature Coefficient
100ppm/K
7000
R/R (ppm)
50ppm/K
2000 -3000 -8000 -50
-25
0
Temperature(C)
25
50
75
100
125
120
Derating
PowerRatingNotes-
Power ( % from nominal power)
100 80 60 40 20 0 25 50 85 100 115 130 145 155 Temperature of the backplate (C)
TheNPR/NHRSeriesResistorsmustbeattachedtoasuitable heatsink.Themaximuminternalresistortemperatureis155C. Tospecifyanappropriateheatsinkusethefollowingformula:
RqH=TMAX-(PxRqR)-TA
P
Where:
RqH=ThermalResistanceofHeatsink(K/W) RqR=ThermalResistanceofResistor(K/W) TMAX=MaximumTemperatureofResistor TA=AmbientTemperatureofHeatsink(C) P=PowerThroughResistor(W)
Dimensions
NPS/NHS2-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.
300CypressAvenue
AlhambraCA91801 www.riedon.com
(626)284-9901
(626)284-1704 Page81
rev.03/2006A
NPRNPS 2-T220T221 NHRNHS2-T220T221
PowerResistors SPECIFICATIONS (continued)
NPR/NHR2-T220
Dimension A B C D E F G H I J K L M N O
mm 17.30 10.16 6.00 O3.7 16.40 5.08 0.76 1.30 13.80 2.00 1.20 4.00 2.90 0.40 1.85
tol. (mm) 0.2 0.2 0.1 0.1 0.2 0.1 0.1 0.1 0.2 0.1 0.1 0.1 0.1 0.1 0.1
inches 0.68 0.40 0.24 O0.146 0.65 0.20 0.03 0.05 0.54 0.08 0.05 0.16 0.11 0.02 0.07
tol. (inches) 0.008 0.008 0.004 0.004 0.008 0.004 0.004 0.004 0.008 0.004 0.004 0.004 0.004 0.004 0.004
NPR/NHR2-T221
tol. (mm) 0.2 0.2 0.1 0.1 0.2 0.1 0.1 0.1 0.2 0.1 0.1 0.1 0.1 0.1 0.1 tol. (inches) 0.008 0.008 0.004 0.004 0.008 0.004 0.004 0.004 0.008 0.004 0.004 0.004 0.004 0.004 0.004
Dimension A B C D E F G H I J K L M N O
mm 18.30 10.16 3.70 O3.2 16.40 5.08 0.76 1.30 13.80 2.00 1.20 4.00 3.90 0.40 1.85
inches 0.72 0.40 0.15 O0.126 0.65 0.20 0.03 0.05 0.54 0.08 0.05 0.16 0.15 0.02 0.07
Riedon Inc.
300CypressAvenue
AlhambraCA91801 www.riedon.com
(626)284-9901
(626)284-1704 Page82
rev.03/2006A


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