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
RIEDON [ RIEDON POWERTRON ]
