NPR NPP T126
FEATURES
•
•
•
•
•
•
•
Resistances from 0.01 to 51K Ohms
Power Rating to 20Watt
Resistance Tolerances to ±0.05%
TCR to ±5ppm/K
TO-126 Housing
Convenient SMD DPak Available
Low Inductance ( <50nH )
TABLE 1—SPECIFICATIONS
Maximum Current
Temperature Range
Dielectric Strength
Max. Operating Voltage
Insulation Resistance
25A
-55°C to +155°C : NPR 2-T126
-55°C to +120°C : NPP 2-T126
2000 VAC
500 V or √(P*R)
>1000 Meg-Ohm
Environmental Performance
Load Life
Humidity Resistance
Temperature Cycle
Solder Heat
Vibration
Type
Power Rating
Heatsink1 Free Air2
DR
±1%
±1%
±0.25%
±0.1%
±0.25%
Thermal
Resistance
Test Conditions
±1%
±1%
±0.25%
±1%
±0.25%
25°C / 90 min ON / 30 min OFF / 1000 hr
40°C / 90-95% RH / DC 0.1W / 1000 hr
-55°C for 30 min / +155°C for 30 min / 1000 hr
+350°C / 3s
Resistance Range
3
Min
0.01W
Max
51KW
Tolerances
Temperature
Coefficients
±50ppm/K ( R > 10W
)
±100ppm/K ( R> 0.1W
)
±250ppm/K
±5 / ±10ppm/K ( R>5W
)
±25ppm/K ( R > 1W
)
NPR 2-T126
20W
1W
5.9K/W
±1% ( R >0.1W
)
±5%
NPP 2-T126
5W
0.5W
6.0K/W
1W
51KW
±0.05% / ±0.1% /
±0.25% ( R > 5W
)
±0.5% ( R> 1W
)
Power rating based on 25°C Flange Temperature
Power rating based on 25°C Ambient Temperature
3
Consult Factory for Higher or Lower Values
1
2
ORDERING INFORMATION
Part Number - Resistance - Tolerance - TCR
NPR 2-T126 0.5 Ohm 1% 100ppm
Document No.: 64330
Revision: 31-01-2015
For technical questions,
contact
powertron@vpgsensors.com
www.powertron.de
1
NPR NPP T126
FIGURE 1—DERATING
Power Rating Notes -
Power Derating Curve
120
100
The NPR 2-T126 Series Foil Resistors must be attached to a
suitable heatsink. The maximum internal resistor temperature
is 155°C (120°C for the NPP 2-T126).
To specify an appropriate heatsink use the following formula :
Power ( % )
80
60
40
20
0
-25
0
25
50
75
100
125
150
175
NP
NP
P
2-
T1
R
2-
T1
26
26
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 )
Ambient Temperature (°C)
FIGURE 2—DIMENSIONS
Mounting Notes -
The NPR 2-T126 Series Film Resistors must be attached to
a suitable heatsink. Mount resistor using thermal grease to
a clean / flat surface. Use a compression washer to provide
150 to 300 pounds ( 665 to 1330N ) of mounting force.
Torque mounting screw to 8 in-lbs ( 0.9 Nm ).
www.powertron.de
2
For technical questions,
contact
powertron@vpgsensors.com
Document No.: 64330
Revision: 31-01-2015
Legal Disclaimer Notice
Vishay Precision Group, Inc.
Disclaimer
ALL PRODUCTS, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE.
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any other disclosure relating to any product.
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not limited to, the warranty expressed therein.
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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
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Copyright Vishay Precision Group, Inc., 2014. All rights reserved.
Document No.: 63999
Revision: 15-Jul-2014
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