PF2270 Series
Thin & Thick Film Power Resistors
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•
•
•
•
•
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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
M4x5mm Screws Included
Isolated Back Plate
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
Technology
Substrate
Torque
AlO
Thick Film
Alumina / Cu Flange
Terminals: 1.0 Nm Max / 0.6 Nm Recommended
Mounting: 1.6 Nm Max / 1 Nm Recommended
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
Thin Film
AlN
0.11 °C/W
Ordering Information
Part Description: Part Type - Resistance - Terminal Style - Tolerance
PF2274 10 Ohms X 5%
Riedon Inc.
300 Cypress Avenue
Alhambra CA 91801
www.riedon.com
(626) 284-9901
(626) 284-1704
5/13
PF2270 Series
Thin Film Power Resistors
SPECIFICATIONS
(continued)
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
Termination 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 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 :
Power ( % )
80
60
40
20
0
R
θH
= T
MAX
- ( P x R
θR
) - T
A
P
Where:
0
25
50
75
100
125
150
175
200
Backplate Temperature (°C)
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
5/13
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