NPR NHR NPS NHS 2-T220 T221
Powertron
•
•
•
•
•
•
•
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%
Document Number: 64213
Revision: 20-09-10
For technical questions, contact:
powertron@vishaypg.com
www.powertron.de
1
NPR NHR NPS NHS 2-T220 T221
Powertron
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 suit-
able 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
www.powertron.de
2
For technical questions, contact:
powertron@vishaypg.com
Document Number: 64213
Revision: 20-09-10
Legal Disclaimer Notice
Vishay Precision Group
Disclaimer
ALL PRODUCTS, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE.
Vishay Precision Group, Inc., its affiliates, agents, and employees, and all persons acting on its or their
behalf (collectively, “Vishay Precision Group”), disclaim any and all liability for any errors, inaccuracies or
incompleteness contained herein or in any other disclosure relating to any product.
The product specifications do not expand or otherwise modify Vishay Precision Group’s terms and conditions of
purchase, including but not limited to, the warranty expressed therein.
Vishay Precision Group makes no warranty, representation or guarantee other than as set forth in the terms
and conditions of purchase.
To the maximum extent permitted by applicable law, Vishay Precision Group
disclaims (i) any and all liability arising out of the application or use of any product, (ii) any and all liability,
including without limitation special, consequential or incidental damages, and (iii) any and all implied
warranties, including warranties of fitness for particular purpose, non-infringement and merchantability.
Information provided in datasheets and/or specifications may vary from actual results in different applications
and performance may vary over time. Statements regarding the suitability of products for certain types of
applications are based on Vishay Precision Group’s knowledge of typical requirements that are often placed on
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properties described in the product specification is suitable for use in a particular application.
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Document No.: 63999
Revision: 27-Apr-11
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