PF2270 Series

PF2270 Series
Thin & Thick Film Power Resistors
•
•
•
•
•
•
•
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)
Additional Lead Configurations
Resistance Range
PF2272
PF2274
PF2276
200 W
300 W
600 W
Y/Z
Y/Z
Y/Z
0.1 to 100K Ohms
50 to 1K Ohms
0.1 to 100K Ohms
Resistance Values
( 0.1 to 1 Ohm only available Terminal Z )
E12 ( Plus 2 Ohm and 5 Ohm )
Thermal Resistance
0.5 °C/W
0.32 °C/W
Tolerances
0.11 °C/W
5% ( 1% optional )
Temperature Coefficient
±100 ppm/°C
Operating Temperature
-55°C to 155°C
MAX Continuous Voltage
√ (P * R)
MAX Continuous Current
55A
Isolation Voltage
2500VAC
Load Life ( 25°C, 90m ON, 30m OFF, 1000hr )
±1%
Humidity ( 40°C, 90-95% RH, DC0.1W, 1000hr )
±1%
Temp. Cycle ( -55°C 30m, 120°C 30m, 20X)
±1%
±0.25%
Vibration ( 0.75mm, 100m/s , 10-54Hz, 10X, XYZ )
2
Insulation Resistance
> 1000 MegOhm
Technology
Thick Film
Substrate
AlO
Thin Film
Alumina / Cu Flange
AlN
Ordering Information
Part Description: Part Type - Terminal Style - Resistance - Tolerance
PF2274Y 10 Ohms 5%
Part Type
Terminal Style
Resistance
Tolerance
PF 2272
(*)
0.1 to 100K Ohms
5%
PF 2274
Y
50 to 1K Ohms
(**)
PF 2276
Z
Riedon Inc.
300 Cypress Avenue
Alhambra CA 91801
www.riedon.com
(*) For standard terminal style omit letter
(**) 1% Tolerance Optional
(626) 284-9901
(626) 284-1704
2/15
PF2270 Series
Thin Film Power Resistors
SPECIFICATIONS (continued)
Dimension
mm
( ± mm )
inches
( ± inches )
A
38.0
0.2
1.50
0.008
B
25.0
0.2
0.98
0.008
C
11.8
0.5
0.47
0.020
D
4.2
0.1
0.165
0.008
E
13.0
0.3
0.512
0.012
F
15.0
0.4
0.591
0.016
G
30.0
0.1
1.181
0.004
H
10.0
0.2
0.394
0.008
Mounting Notes The PF2270 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 N-m ).
Back plate is isolated from both pins.
Terminal Configuation & Schematics
4
3
4
3
4
3
1
2
1
2
1
2
STANDARD
PF2272
PF2274
PF2276
Y
Z
PF2272Y
PF2274Y
PF2276Y
PF2272Z
PF2274Z
PF2276Z
Note: Style Z is not a true 4-terminal measurement
Current can be applied to any pins
Power Rating Notes -
Power Derating Curve
The PF2270 Series Foil Resistors must be attached to a suitable
heatsink. The maximum internal resistor temperature is 155°C.
120
100
RθH = TMAX - ( P x RθR ) - TA
P
Where:
RθH = Thermal Resistance of Heatsink ( K/W )
RθR = Thermal Resistance of Resistor ( K/W )
TMAX = Maximum Temperature of Resistor
TA = Ambient Temperature of Heatsink ( °C )
P = Power Through Resistor ( W )
Riedon Inc.
300 Cypress Avenue
Power ( % )
To specify an appropriate heatsink use the following formula :
80
60
40
20
0
0
25
50
75
100
125
150
175
200
Backplate Temperature (°C)
Alhambra CA 91801
www.riedon.com
(626) 284-9901
(626) 284-1704
2/15