RIEDON PF2472

PF2470 Series
TO-247 Power Film Resistors
•
•
•
•
•
•
•
TO-247 Housing
Rated Power to 140 Watts
Resistances from 0.01 to 51K Ohms
High Stability Film Resistance Elements
Resistance Tolerance to ±0.05%
Low Inductance ( <50nH )
Isolated Back Plate
SPECIFICATIONS
Type
Power Rating
Heatsink1
Free Air2
Resistance Range3
Thermal
Resistance
Min
Max
Tolerances
Temperature
Coefficients
PF2473
140W
5W
0.9°C/W
0.01W
51KW
±1% ( R ≥ 0.10W )
±5%
±50ppm/°C ( R≥10W )
±100ppm/°C ( 0.1W ≤ R < 10W )
±250ppm/°C ( R < 0.1W )
PF2472
100W
3W
1.3°C/W
0.01W
51KW
±1% ( R ≥ 0.10W )
±5%
±50ppm/°C ( R≥10W )
±100ppm/°C ( 0.1W ≤ R < 10W )
±250ppm/°C ( R < 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
Dielectric Strength
2000 VAC
Max. Operating Voltage
500 V
Insulation Resistance
>1000 Meg-Ohm
Environmental Performance
DR
Test Conditions
Load Life
±1% + 0.05W
25°C, 90 min ON, 30 min OFF, 1000 hr
Humidity Resistance
±1% + 0.05W
40°C, 90-95% RH, DC 0.1W, 1000 hr
Temperature Cycle
±0.25% + 0.05W
-55°C for 30 min, +155°C for 30 min, 1000 hr
Solder Heat
±0.1% + 0.05W
+350°C, 3s
Vibration
±0.25% + 0.05W
Riedon Inc.
11/10
300 Cypress Avenue
IEC60068-2-6
Alhambra CA 91801
www.riedon.com
(626) 284-9901
(626) 284-1704
PF2470 Series
TO-247 Power Film Resistors
SPECIFICATIONS (continued)
Power Rating Notes -
Power Derating Curve
120
The PF2470 Series Foil Resistors must be attached to a suitable
heatsink. The maximum internal resistor temperature is 155°C
(120°C for the PF2201).
Power ( % )
100
80
To specify an appropriate heatsink use the following formula :
60
RqH = TMAX - ( P x RqR ) - TA
P
40
20
0
-25
0
25
50
75
100
125
150
175
Ambient Temperature (°C)
Where:
RqH = Thermal Resistance of Heatsink ( °C/W )
RqR = Thermal Resistance of Resistor ( °C/W )
TMAX = Maximum Temperature of Resistor
TA = Ambient Temperature of Heatsink ( °C )
P = Power Through Resistor ( W )
Mounting Notes The PF2470 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 N-m ).
Back plate is isolated from both pins.
Ordering Information
Part Number - Resistance - Tolerance - TCR
Example: PF2472 10 Ohm 1% 50ppm
Riedon Inc.
11/10
300 Cypress Avenue
Alhambra CA 91801
www.riedon.com
(626) 284-9901
(626) 284-1704