Riedon NPP2-T126 Power film resistor Datasheet

NPR NPP 2-T126
TO-126 Power Film Resistors
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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
NPR 2-T126
NPP 2-T126
Power Rating
Heatsink1 Free Air2
20W
1W
5W
0.5W
Resistance Range3
Thermal
Resistance
Tolerances
Temperature
Coefficients
51KW
±1% ( R > 0.1W )
±5%
±50ppm/K ( R>10W )
±100ppm/K ( R>0.1W )
±250ppm/K
51KW
±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
Min Max
5.9K/W
0.01W
6.0K/W
0.1W
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
Specification
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
±1%
40°C / 90-95% RH / DC 0.1W / 1000 hr
Humidity Resistance
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%
Riedon Inc.
1.01
300 Cypress Avenue
Alhambra CA 91801
(626) 284-9901
(626) 284-1704
www.riedon.com
Page 78
NPR NPP 2-T126
TO-126 Power Film Resistors
SPECIFICATIONS (continued)
Power Rating Notes -
Power Derating Curve
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).
120
Power ( % )
100
80
60
R
P
40
20
0
NP
NP
2-
To specify an appropriate heatsink use the following formula :
2-T
RqH = TMAX - ( P x RqR ) - TA
P
12
T1
6
26
Where:
-25
0
25
50
75
100
125
150
Ambient Temperature (°C)
175
RqH = Thermal Resistance of Heatsink ( K/W )
RqR = Thermal Resistance of Resistor ( K/W )
TMAX = Maximum Temperature of Resistor
TA = 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
Riedon Inc.
1.01
300 Cypress Avenue
Alhambra CA 91801
(626) 284-9901
(626) 284-1704
www.riedon.com
Page 79
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