PF1260 Series
TO-126 Power Film Resistors
•
•
•
•
•
•
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TO-126 Housing
Resistances from 0.01 to 51K Ohms
Rated Power to 20 Watts
Resistance Tolerances to ±0.05%
TCR to ±5ppm/K
Low Inductance ( <50nH )
Isolated Back Plate
SPECIFICATIONS
Type
Power Rating
Heatsink Free Air
1
2
Thermal
Resistance
Resistance Range
Min Max
0.01W
51KW
3
Tolerances
±1% ( R ≥0.1W
)
±5%
±0.1%, ±0.25% ( R≥5W
)
±0.5% ( R≥1W
),
±1%
1
Temperature
Coefficients
±50ppm/°C ( R ≥10W
)
±100ppm/°C ( 0.1W ≤ R < 10W )
±250ppm/°C ( R < 0.1W )
±5ppm/°C ( R≥1W
)
±25ppm/°C ( R <1W
)
PF1262
20W
1W
5.9K/W
PF1261
5W
0.5W
6.0K/W
0.1W
51KW
Power rating based on 25°C Flange Temperature
Power rating based on 25°C Ambient Temperature
3
Consult Factory for Higher or Lower Values
2
Specification
Maximum Current
Temperature Range
Dielectric Strength
Max. Operating Voltage
Insulation Resistance
Value
25A
-55°C to +155°C : PF1262
-55°C to +120°C : PF1261
2000 VAC
500 V
>1000 Meg-Ohm
Environmental Performance
Load Life
Humidity Resistance
Temperature Cycle
Solder Heat
Vibration
DR
±1% + 0.05W
±1% + 0.05W
±0.25% + 0.05W
±0.1% + 0.05W
±0.25% + 0.05W
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.
11/10
300 Cypress Avenue
Alhambra CA 91801
www.riedon.com
(626) 284-9901
(626) 284-1704
PF1260 Series
TO-126 Power Film Resistors
SPECIFICATIONS
(continued)
Power Derating Curve
120
100
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 :
Power ( % )
80
60
40
20
0
PF
PF
12
61
12
62
R
qH
= T
MAX
- ( P x R
qR
) - T
A
P
125
150
175
-25
0
25
50
75
100
Ambient Temperature (°C)
Where:
R
qH
= Thermal Resistance of Heatsink ( K/W )
R
qR
= Thermal Resistance of Resistor ( K/W )
T
MAX
= Maximum Temperature of Resistor
T
A
= Ambient Temperature of Heatsink ( °C )
P = Power Through Resistor ( W )
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.
Ordering Information
Part Number - Resistance - Tolerance - TCR
Example: PF1262 0.5 Ohm 1% 100ppm
Riedon Inc.
11/10
300 Cypress Avenue
Alhambra CA 91801
www.riedon.com
(626) 284-9901
(626) 284-1704
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