FPR FNR 2-T227 4-T227
Foil Power Resistors
SPECIFICATIONS (continued)
Temperature Coefficient
table A
4000
2000
0
250
200
+15ppm/°C
150
100
-15ppm/°C
-2000
-4000
-6000
Limit 2 (3σ)
Nominal ∆R/R
Limit 1 (3σ)
50
0
-8000
2
5
10
20 50 100 200
-40
-20
0
20
40
60
80
100
120
140
Resistance Value (mOhm)
Temperature (°C)
Derating and Stability
Power Rating Notes -
120
100
80
60
40
20
0
The FPR/FNR Series Foil Resistors must be attached to a suit-
able heatsink. The maximum internal resistor temperature is
130°C for a 0.5% stability part.
0.5%
0.2%
0.1%
To specify an appropriate heatsink use the following formula :
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 )
25
50
85
100
115
130
Temperature of the backplate (°C)
Dimensions and Attachment Variations
tol.
tol.
Dimension
mm
26
38
12.7
4
(±mm)
inches
1.02
1.50
0.50
0.16
1.18
0.59
0.16
0.39
0.31
0.16
0.08
0.03
M4
(±inches)
A
B
C
D
E
F
G
H
I
0.5
0.5
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.1
0.020
0.020
0.008
0.008
0.008
0.008
0.008
0.008
0.008
0.008
0.008
0.004
30
15
4.1
10
8
J
4
K
L
2
0.8
M4
10
11.9
M
N
O
0.2
0.2
0.39
0.47
0.008
0.008
FPR/FNR 2-T227
FPR/FNR 4-T227
Riedon Inc. 300 Cypress Avenue
Alhambra CA 91801
www.riedon.com
(626) 284-9901
(626) 284-1704
06/13
RIEDON [ RIEDON POWERTRON ]
