PF1260 RIEDON [Riedon Powertron], PF1260 Datasheet - Page 2

• Manufacturer Part Number: PF1260
• Description: TO-126 Power Film Resistors
• Manufacturer: RIEDON [Riedon Powertron]

PF1260 Series
TO-126 Power Film Resistors
Riedon Inc.
11/10
Part Number - Resistance - Tolerance - TCR
Example: PF1262 0.5 Ohm 1% 100ppm
120
100
80
60
40
20
0
-25
0
Ambient Temperature (°C)
Power Derating Curve
25
300 Cypress Avenue
50
75
100
SPECIFICATIONS
Ordering Information
125
Alhambra CA 91801
www.riedon.com
150
175
Power Rating Notes -
The PF1260 Series Film Resistors must be attached to a suit-
able heatsink. The maximum internal resistor temperature is
155°C (120°C for the PF1261).
To specify an appropriate heatsink use the following formula :
R
Where: R
Mounting Notes -
The PF1260 Series Film Resistors must be attached to a suit-
able 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.
(continued)
qH
= T
P
MAX
R
T
T
P = Power Through Resistor ( W )
A
MAX
qH
qR
= Ambient Temperature of Heatsink ( °C )
- ( P x R
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= Thermal Resistance of Heatsink ( K/W )
= Thermal Resistance of Resistor ( K/W )
= Maximum Temperature of Resistor
qR
) - T
A
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