FHR 4-2321
Current Sense Resistors
SPECIFICATIONS (continued)
Temperature Coefficient
2000
0
Limit 2
-2000
-4000
-6000
-8000
Nominal
∆R/R
Limit 1
-10000
-40
-20
0
20
40
60
80
100
120
140
Temperature (°C)
Derating
Power Rating Notes -
The FHR Series Resistors must be attached to a suitable heat-
sink. The maximum internal resistor temperature is 130°C.
To specify an appropriate heatsink use the following formula :
120
0.5%
100
0.2%
80
0.1%
60
RθH = TMAX - ( P x RθR ) - TA
P
40
20
0
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 )
25
50
85
100
115
130
Temperature of the backplate (°C)
Dimensions
tol.
tol.
Dimension
mm
17.25
22.30
3.20
Ø3.20
16.75
7.62
17.78
1.50
1.10
2.00
3.00
8.00
3.00
1.50
4.50
3.75
0.80
2.10
(±mm)
inches
0.68
0.88
0.13
Ø0.13
0.66
0.30
0.70
0.06
0.04
0.08
0.12
0.31
0.12
0.06
0.18
0.15
0.03
0.08
(±inches)
A
B
C
D
E
F
±0.2
±0.2
±0.008
±0.008
±0.004
±0.004
±0.2
±0.1
±0.1
±0.008
±0.008
±0.008
±0.2
±0.2
G
H
I
±0.2
±0.008
±0.2
±0.008
±0.004
±0.004
±0.008
±0.008
±0.004
±0.004
±0.008
±0.1
J
±0.1
K
L
±0.1
±0.2
M
N
O
P
Q
R
±0.2
±0.1
±0.1
±0.2
±0.004
±0.2
±0.008
Riedon Inc.
300 Cypress Avenue
Alhambra CA 91801
www.riedon.com
(626) 284-9901
(626) 284-1704
Page 28
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RIEDON [ RIEDON POWERTRON ]
