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
Legal Disclaimer Notice
Vishay Precision Group
Disclaimer
ALL PRODUCTS, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE.
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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
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Document No.: 63999
Revision: 27-Apr-11
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1
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