PF2470 Series
TO-247 Power Film Resistors
SPECIFICATIONS(continued)
Power Rating Notes -
Power Derating
% Power
The PF2470 Series Thin Film Resistors must be attached to a suit-
able heatsink. The maximum internal resistor temperature is 175°C.
+25 °C
100
To specify an appropriate heatsink use the following formula :
80
60
40
20
0
TMAX - (P * RHR) - TA
RHH =
P
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 )
+175 °C
-50
0
50
100
150
200
Flange Temperature (C)
A
D
tolerance
±
tolerance
±
Inches
Dimension
mm
0.008
0.02
A
B
16.0
20.0
0.2
0.5
0.63
F
0.787
B
C
*
0.02
C
14.5
4.8
0.5
0.2
0.571
0.189
ØH
0.008
D
E
F
0.004
0.02
10.9
5.1
0.1
0.5
0.429
0.201
0.032
I
0.002
G
0.8
0.05
ØG
0.004
0.008
H
I
3.6
3.6
0.1
0.2
0.142
0.142
E
* 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.
300 Cypress Avenue
Alhambra CA 91801
(626) 284-9901
(626) 284-1704
Revised: 201901_003
© Riedon, Inc.
www.riedon.com
sales@riedon.com
RIEDON [ RIEDON POWERTRON ]
