PF2270 Series
Thin Film Power Resistors
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Resistances from 0.1 Ohms to 100K Ohms
Power Rating to 600 Watts
Resistance Tolerances to ±1%
TCR of ±100ppm/C
TO-227 (TO-238) Housing
Isolated Back Plate
Dual Resistor Package Available
SPECIFICATIONS
Type
Power Rating (with heatsink)
Resistance Range
Resistance Values
Thermal Resistance
Tolerances
Temperature Coefficient
Operating Temperature
MAX Continuous Voltage
MAX Continuous Current
Isolation Voltage
Load Life
( 25°C, 90m ON, 30m OFF, 1000hr )
Humidity
( 40°C, 90-95% RH, DC0.1W, 1000hr )
Temp. Cycle
( -55°C 30m, 120°C 30m, 20X)
Vibration
( 0.75mm, 100m/s
2
, 10-54Hz, 10X, XYZ )
Insulation Resistance
Recommended Mounting Torques
0.5 °C/W
PF2272
200 W
0.1 to 100K Ohms
PF2274
300 W
( 0.1 to 1 Ohm only available Terminal Z )
PF2276
600 W
50 to 1K Ohms
0.1 to 100K Ohms
E12 ( Plus 2 Ohm and 5 Ohm )
0.32 °C/W
5% ( 1% optional )
±100 ppm/°C
-55°C to 155°C
√ (P * R)
55A
2500VAC
±1%
±1%
±1%
±0.25%
> 1000 MegOhm
Terminals: 0.6 Nm Backplate: 1.0Nm
0.11 °C/W
Dimension
A
B
C
D
E
F
G
H
mm
38.0
25.0
11.8
4.2
13.0
15.0
30.0
10.0
(±mm)
0.2
0.2
0.5
0.1
0.3
0.4
0.1
0.2
inches
1.50
0.98
0.47
0.165
0.512
0.591
1.181
0.394
(±inches)
0.008
0.008
0.020
0.008
0.012
0.016
0.004
0.008
Ordering Information
Part Number - Terminal Style - Resistance - Tolerance
PF2274X 10 Ohms 5% 4T
Riedon Inc.
300 Cypress Avenue
Alhambra CA 91801
www.riedon.com
(626) 284-9901
(626) 284-1704
12/10a
PF2270 Series
Thin Film Power Resistors
SPECIFICATIONS
(continued)
Available Terminal Styles
4
1
Style X
Standard
3
2
4
1
Style Y
3
2
4
1
Style Z
3
2
Note: Style Z is not a true 4-terminal measurement
Current can be applied to any pins
Power Derating Curve
120
100
Power ( % )
80
60
40
20
0
0
25
50
75
100
125
150
175
200
Ambient Temperature (°C)
Power Rating Notes -
The PF2270 Series Foil 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 :
R
θH
= T
MAX
- ( P x R
θR
) - T
A
P
Where:
R
θ
H
= Thermal Resistance of Heatsink ( K/W )
R
θ
R
= Thermal Resistance of Resistor ( K/W )
T
MAX
= Maximum Temperature of Resistor
T
A
= Ambient Temperature of Heatsink ( °C )
P = Power Through Resistor ( W )
Riedon Inc.
300 Cypress Avenue
Alhambra CA 91801
www.riedon.com
(626) 284-9901
(626) 284-1704
12/10a
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