PF2470 Series
TO-247 Power Film Resistors
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•
•
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TO-247 Housing
Rated Power to 140 Watts
Resistances from 0.02 to 51K Ohms
High Stability Film Resistance Elements
Resistance Tolerance to ±1%
Low Inductance ( <50nH )
Isolated Back Plate
SPECIFICATIONS
Power Rating
Heatsink1
Free Air2
Type
Thermal
Resistance
Resistance Range
3
Min
0.02
Max
51K
Tolerances
Temperature
Coefficients
±50ppm/°C ( R≥10
±100ppm/°C ( 0.1≤ R <10)
±250ppm/°C ( R < 0.1)
±50ppm/°C ( R≥10
±100ppm/°C ( 0.1≤ R <10)
±250ppm/°C ( R < 0.1)
PF2473
140W
5W
0.9°C/W
±1% ( R≥ 0.10
±5%
PF2472
100W
3W
1.3°C/W
0.02
51K
±1% ( R≥ 0.10
±5%
1
2
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
Temperature Range
Dielectric Strength
Max. Operating Voltage
Inductance
Insulation Resistance
Terminal Finish
Flammability Rating
Value
-55°C to +175°C
2500 VAC
700 V or √P*R, whichever is less
PF2472 11.7nH / PF2473 12.3nH
>1000 Meg-Ohm
Tin Plated Copper
94-V0
Environmental Performance
Load Life
Humidity Resistance
Temperature Cycle
Solder Heat
Vibration
R
±1% + 0.05
±1% + 0.05
±0.25% + 0.05
±0.1% + 0.05
±0.25% + 0.05
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
IEC60068-2-6
Riedon Inc.
©
Riedon, Inc.
300 Cypress Avenue
Alhambra CA 91801
(626) 284-9901
www.riedon.com
sales@riedon.com
(626) 284-1704
Revised: 201803_002
PF2470 Series
TO-247 Power Film Resistors
SPECIFICATIONS
(continued)
Power Derating
% Power
100
80
60
40
20
0
-50
0
+175
°
C
50
100
150
Flange Temperature (C)
200
Where:
R
H
= Thermal Resistance of Heatsink ( °C/W )
R
R
= Thermal Resistance of Resistor ( °C/W )
T
MAX
= Maximum Temperature of Resistor
T
A
= Ambient Temperature of Heatsink ( °C )
P = Power Through Resistor ( W )
Power Rating Notes -
The PF2470 Series Thin Film Resistors must be attached to a suit-
able heatsink. The maximum internal resistor temperature is 175°C.
To specify an appropriate heatsink use the following formula :
+25
°
C
Dimension
A
B
C
*
D
E
F
G
H
I
mm
16.0
20.0
14.5
4.8
10.9
5.1
0.8
3.6
3.6
tolerance
±
Inches
tolerance
±
0.2
0.5
0.5
0.2
0.1
0.5
0.05
0.1
0.2
0.63
0.787
0.571
0.189
0.429
0.201
0.032
0.142
0.142
*
Custom lead lengths available. Contact factory.
Mounting Notes -
The PF2470 Series Thin 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 Description: Part Type - Resistance - Tolerance
Example: PF2472 10 Ohm 1%
Riedon Inc.
©
Riedon, Inc.
300 Cypress Avenue
Alhambra CA 91801
(626) 284-9901
www.riedon.com
sales@riedon.com
(626) 284-1704
Revised: 201803_002
PF2470 Series
TO-247 Power Film Resistors
Pulse Energy Durability
Pulse Peak Power (W)
1000k
100k
10k
1k
1100W
100
100W
10
10n 100n 1u
10u
100u 1m
10m
100m 1
10
10
10n 100n 1u
10u
100u 1m
10m 100m 1
10
100
140W
PF2472_10ohm-1%
Tentative continuous-pulse power allowance at
duty 0.01. Load life test will be necessary in
actual equipment, Because curve will be changed
by resistance, repetition, duty and operating
temperature. Dotted shows estimation.
Pulse Energy Durability
Pulse Peak Power (W)
1000k
100k
10k
1k
PF2473_10ohm-1%
Tentative continuous-pulse power allowance at
duty 0.01. Load life test will be necessary in
actual equipment, Because curve will be changed
by resistance, repetition, duty and operating
temperature. Dotted shows estimation.
1300W
Riedon Inc.
©
Riedon, Inc.
300 Cypress Avenue
Alhambra CA 91801
(626) 284-9901
www.riedon.com
sales@riedon.com
(626) 284-1704
Revised: 201803_002
