PF1262 Series
TO-126 Power Thin Film Resistors
SPECIFICATIONS(continued)
Power Derating Curve
Power Rating Notes -
120
100
80
60
40
20
0
The PF1260 Series Thin Film Resistors must be attached to a
suitable heatsink. The maximum internal resistor temperature is
155°C.
To specify an appropriate heatsink use the following formula :
RθH = TMAX - ( P x RθR ) - TA
P
-25
0
25
50
75
100
125
150
175
Where: RθH = Thermal Resistance of Heatsink ( K/W )
RθR = Thermal Resistance of Resistor ( K/W )
TMAX = Maximum Temperature of Resistor
TA = Ambient Temperature of Heatsink ( °C )
P = Power Through Resistor ( W )
Backplate Temperature (°C)
Mounting Notes -
The PF1260 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 Nm ).
Back plate is isolated from both pins.
Riedon Inc.
300 Cypress Avenue
Alhambra CA 91801
(626) 284-9901
(626) 284-1704
08/14
www.riedon.com
RIEDON [ RIEDON POWERTRON ]
