NPR NPS 2-T220 T221
NHR NHS 2-T220 T221
Power Resistors
•
•
•
•
•
•
•
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
Resistance Range
Power rating
free air 70°C
with heatsink
Thermal Resistance Rthj-c
Tolerances
from 0.02 Ohms
from 1.0 Ohms
Stability
Temperature Coefficient
0.02 to 0.049 Ohms
0.05 to 0.099 Ohms
0.1 Ohms to 100 kOhms
Voltage Proof
Max. Voltage
depending on resistance value
2.0 kVDC
2% / 5%
1% / 2% / 5%
0.5%
±600 ppm/K
±300 ppm/K
±100 ppm/K
upon request ±50 ppm/K
1.5 kVDC
NPR / NPS
0.02 Ohms to 100kOhms
1.5 W
30 W
3.5 K/W
NHR / NHS
0.02 Ohms to 15kOhms
1.5 W
50 W
2.1 K/W
10000
max. working voltage (VDC)
1000
100
10
1
2 Ohm
Operating Temperature Range
Resistor Material
Substrate
Housing
Connector Material
Terminals
Max. Torque
10 Ohm
100 Ohm
1 kOhm
5 kOhm
10 kOhm 100 kOhm
-40 to 155°C
Thick Film
Al
2
O
3
Epoxy or PPS
Cu tinned
2
T220: 1 Nm
T221: 0.8 Nm
Ordering Information
Part Number - Resistance - Contact - Tolerance
NHR 2-T221 C 1.1 kOhms 1%
Riedon Inc.
300 Cypress Avenue
Alhambra CA 91801
www.riedon.com
(626) 284-9901
(626) 284-1704
Page 80
rev. 03/2006A
NPR NPS
2-T220 T221
NHR NHS
2-T220 T221
Power Resistors
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
Power Rating Notes -
Power ( % from
nominal power)
100
80
60
40
20
0
25
50
85
100
115
130
145
155
Temperature of the backplate (°C)
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
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
www.riedon.com
(626) 284-9901
(626) 284-1704
Page 81
rev. 03/2006A
PCB Design
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