PF2270

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)
PF2272
PF2274
PF2276
200 W
300 W
600 W
Power Rating (without heatsink)
5W
5W
5W
Additional Lead Configurations
Y/Z
Y/Z
Y/Z
0.1 to 100K Ohms
50 to 1K Ohms
Resistance Range
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
0.35 °C/W
0.32 °C/W
Tolerances
5% ( 1% optional )
Temperature Coefficient
±100 ppm/°C
Operating Temperature
-55°C to 155°C
Inductance
14 nH
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/s2, 10-54Hz, 10X, XYZ )
Insulation Resistance
> 1000 MegOhm
Technology
Thick Film
Substrate
Riedon Inc.
0.11 °C/W
AlO
300 Cypress Avenue
Alhambra CA 91801
www.riedon.com
Thin Film
Alumina / Cu Flange
(626) 284-9901
AlN
(626) 284-1704
5/16
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 Configuration & Schematics
4
3
4
3
4
3
1
2
1
2
1
2
STANDARD
Z
Y
PF2272
PF2274
PF2276
PF2272Z
PF2274Z
PF2276Z
PF2272Y
PF2274Y
PF2276Y
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
5/16
PF2270 Series
Thin Film Power Resistors
SPECIFICATIONS (continued)
Pulse Energy Durability
Pulse Energy Durability
Pulse
Peak Power (W)
䢢
1000k
PF2272_10ohm-1%
1000k
Tentative continuous-pulse power allowance at
duty 0.01. Load life test will be necessary in
actual equipment, Because curve will be changed
by resistance, repetition, duty and operating
temperature. Dotted shows estimation.
100k
Pulse peak power (W)
PF2274_10 ohm-1%
Tentative continuous-pulse power allowance at
duty 0.01. Load life test will be necessary in
actual equipments, because curve may be
changed by resistance, repetition, duty and
operating temperature. Dotted shows estimation.
100k
10k
10k
10kW
1k
1k
100
100
950W
200W
10
10n 100n 1u
10u
100u 1m
10m
100m 1
10
10
10n 100n
45W
1u
10u 100u
1m
10m 100m
1
10
Pulse Energy Durability
䢢
Pulse Peak Power (W)
PF2276_10ohm-1%
1000k
Tentative continuous-pulse power allowance at
duty 0.01. Load life test will be necessary in
actual equipment, Because curve will be changed
by resistance, repetition, duty and operating
temperature. Dotted shows estimation.
100k
10k
16kW
1k
100
600W
10
10n 100n
1u
10u
100u 1m
10m 100m
1
10
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
5/16