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
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Vishay Precision Group, Inc.
Disclaimer
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Document No.: 63999
Revision: 15-Jul-2014
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