For technical questions, contact: powertron@vishaypg.com
NPR NPP T126
Powertron
Document Number: 64330
Revision: 20-09-10
www.powertron.de
1
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
1 Power rating based on 25°C Flange Temperature
2 Power rating based on 25°C Ambient Temperature
3 Consult Factory for Higher or Lower Values
Specication Value
Maximum Current 25A
Temperature Range -55°C to +155°C : NPP 2T126
-55°C to +120°C : NPR 2-T126
Dielectric Strength 2000 VAC
Max. Operating Voltage 500 V
Insulation Resistance >1000 Meg-Ohm
Environmental Performance DR Test Conditions
Load Life ±1% 25°C / 90 min ON / 30 min OFF / 1000 hr
Humidity Resistance ±1% 40°C / 90-95% RH / DC 0.1W / 1000 hr
Temperature Cycle ±0.25% -55°C for 30 min / +155°C for 30 min / 1000 hr
Solder Heat ±0.1% +350°C / 3s
Vibration ±0.25%
Type Power Rating
Heatsink1 Free Air2
Thermal
Resistance
Resistance Range3
Min Max Tolerances Temperature
Coefcients
NPR 2-T126 20W 1W 5.9K/W 0.01W51KW±1% ( R>0.1W )
±5%
±50ppm/K ( R>10W )
±100ppm/K ( R>0.1W )
±250ppm/K
NPP 2-T126 5W 0.5W 6.0K/W 0.1W51KW
±0.05% / ±0.1% / ±0.25%
( R>5W )
±0.5% ( R>1W ) /
±1% ( R>0.1W )
±2% / ±5%
±5 / ±10ppm/K ( R> 1W )
±25ppm/K ( R>0.1W )
±100ppm/K
For technical questions, contact: powertron@vishaypg.com
NPR NPP T126
Powertron
Document Number: 64330
Revision: 20-09-10
www.powertron.de
2
Part Number - Resistance - Tolerance - TCR
Example: NPR 2-T126 0.5 Ohm 1% 100ppm
SPECIFICATIONS (continued)
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 :
RqH = TMAX - ( P x RqR ) - TA
P
Where: RqH = 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 )
-25 0 25 50 75 100 125 150 175
0
20
40
60
80
100
120
Power ( % )
Ambient Temperature (°C)
NPP 2-T126
NPR 2-T126
Power Derating Curve
Mounting Notes -
The NPR 2-T126 Series Film Resistors must be attached to
a suitable heatsink. Mount resistor using thermal grease to
a clean / at 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
Vishay Precision Group
Document No.: 63999
Revision: 27-Apr-11
www.vishaypg.com
1
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Document No.: 63999
Revision: 27-Apr-11