PF1262 Series
TO-126 Power Thin Film Resistors
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TO-126 Housing
Resistances from 0.01 to 51K Ohms
Rated Power to 20 Watts
Resistance Tolerances to ±1%
TCR to ±50ppm/°C
Low Inductance ( <50nH )
Isolated Back Plate
SPECIFICATIONS
Type
Power Rating
Heatsink
1
Free Air
2
Thermal
Resistance
Resistance Range
Min
0.01Ω
Max
51KΩ
3
Tolerances
Temperature
Coefficients
±50ppm/°C ( R ≥10Ω
)
±100ppm/°C ( 0.1Ω ≤ R < 10Ω )
±250ppm/°C ( R < 0.1Ω )
PF1262
20W
1W
5.9K/W
±1% ( R ≥0.1Ω
)
±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
Maximum Current
Temperature Range
Dielectric Strength
Max. Operating Voltage
Insulation Resistance
Value
25A
-55°C to +155°C : PF1262
2000 VAC
500 V
>1000 Meg-Ohm
Environmental Performance
Load Life
Humidity Resistance
Temperature Cycle
Solder Heat
Vibration
∆R
±1% + 0.05Ω
±1% + 0.05Ω
±0.25% + 0.05Ω
±0.1% + 0.05Ω
±0.25% + 0.05Ω
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
Ordering Information
Part Description: Part Type - Resistance - Tolerance
Example: PF1262 0.5 Ohm 1%
Riedon Inc.
08/14
300 Cypress Avenue
Alhambra CA 91801
www.riedon.com
(626) 284-9901
(626) 284-1704
PF1262 Series
TO-126 Power Thin Film Resistors
SPECIFICATIONS
(continued)
Power Derating Curve
120
100
Power Rating Notes -
The PF1260 Series Thin Film Resistors must be attached to a
suitable heatsink. The maximum internal resistor temperature is
155°C.
Power ( % )
80
60
40
20
0
-25
0
25
50
75
100
125
150
175
PF
12
62
To specify an appropriate heatsink use the following formula :
R
θH
= T
MAX
- ( P x R
θR
) - T
A
P
Where:
Backplate Temperature (°C)
R
θH
= Thermal Resistance of Heatsink ( K/W )
R
θR
= 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 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.
08/14
300 Cypress Avenue
Alhambra CA 91801
www.riedon.com
(626) 284-9901
(626) 284-1704
