NPR NPP T126
Powertron
•
•
•
•
•
•
•
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 )
SPECIFICATIONS
Type
Heatsink1 Free Air2
Power Rating
Thermal
Resistance
Resistance Range
3
Min
0.01W
Max
51KW
Tolerances
±1% ( R>0.1W
)
±5%
±0.05% / ±0.1% / ±0.25%
( R> 5W
)
±0.5% ( R>1W
) /
±1% ( R >0.1W
)
±2% / ±5%
1
2
Temperature
Coefficients
±50ppm/K ( R>10W
)
±100ppm/K ( R>0.1W
)
±250ppm/K
±5 / ±10ppm/K ( R>1W
)
±25ppm/K ( R>0.1W
)
±100ppm/K
NPR 2-T126
20W
1W
5.9K/W
NPP 2-T126
5W
0.5W
6.0K/W
0.1W
51KW
Power rating based on 25°C Flange Temperature
Power rating based on 25°C Ambient Temperature
3
Consult Factory for Higher or Lower Values
Specification
Maximum Current
Temperature Range
Dielectric Strength
Max. Operating Voltage
Insulation Resistance
Value
25A
-55°C to +155°C : NPP 2T126
-55°C to +120°C : NPR 2-T126
2000 VAC
500 V
>1000 Meg-Ohm
Environmental Performance
Load Life
Humidity Resistance
Temperature Cycle
Solder Heat
Vibration
DR
±1%
±1%
±0.25%
±0.1%
±0.25%
Test Conditions
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
Document Number: 64330
Revision: 20-09-10
For technical questions, contact:
powertron@vishaypg.com
www.powertron.de
1
NPR NPP T126
Powertron
SPECIFICATIONS
(continued)
Power Derating Curve
120
100
Power Rating Notes -
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
NP
NP
P
2-
T1
R
2-T
12
6
26
R
qH
= T
MAX
- ( P x R
qR
) - T
A
P
Where:
125
150
175
-25
0
25
50
75
100
Ambient Temperature (°C)
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 )
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 ).
Ordering Information
Part Number - Resistance - Tolerance - TCR
Example: NPR 2-T126 0.5 Ohm 1% 100ppm
www.powertron.de
2
For technical questions, contact:
powertron@vishaypg.com
Document Number: 64330
Revision: 20-09-10
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Vishay Precision Group
Disclaimer
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Document No.: 63999
Revision: 27-Apr-11
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1
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