For technical questions, contact: powertron@vishaypg.com
FPR FNR 2-T227 FPR FNR 4-T227
Powertron
Document Number: 64207
Revision: 20-09-10
www.powertron.de
1
SPECIFICATIONS
Resistances from 0.001Ohm to 100Ohms•
Power Rating to 80Watt•
Resistance Tolerances to ±0.1%•
TCR to ±15ppm/K•
Load Stability to 0.1%•
Type FPR 2-T227 FPR 4-T227 FNR 2-T227 FNR 4-T227
Terminals 2 4
(kelvin connection)
2 4
(kelvin connection)
Resistance Range 0.01 to 100 Ohms 0.001 to 100 Ohms 0.01 to 100 Ohms 0.001 to 100 Ohms
Power Rating
(with heatsink)
60W 80W
Thermal Resistance Rthj-c 1.3 K/W 1.0 K/W
Tolerances 0.1% / 1% / 2% / 5%
(others upon request)
Stability 0.1% / 0.2% / 0.5%
(depends on stress)
Temperature Coefcient ±15 ppm/K (20 to 60°C)
from R < 0.02 Ohms ±20 ppm/K (20 to 60°C)
FPR 2-T227 / FNR 2-T227 TK Shift depends from
resistance value (see graph next page)
Voltage Proof 1.5 kV DC
Thermal EMF < 1 µV/K
Max. Current 50A
(higher upon request)
Operating Temperature -40°C to 130°C
Resistor Material Metalfoil CuNiMn (DIN 17471)
Substrate Al2O3AlN
Housing Epoxy
Connector Material Cu / tinned or nickel plated
Max. Torque backplate: 1.5Nm
terminals: 1.3 Nm
Part Number - Resistance - Tolerance
FPR 2-T227 1.1 Ohms 1%
Ordering Information
For technical questions, contact: powertron@vishaypg.com
FPR FNR 2-T227 FPR FNR 4-T227
Powertron
Document Number: 64207
Revision: 20-09-10
www.powertron.de
2
DR/R (ppm)
Temperature (°C)
-40
200
-20 140
120
80
6040 100
-8000
4000
2000
0
-2000
-4000
-6000
+15ppm/K
-15ppm/K
Limit 2 (3s)
Limit 1 (3s)
Nominal
DR/R
2
5
10
20
50
100
200
TCR-Shift (ppm/K)
Resistance Value (mOhm)
table A
Temperature Coefcient
Derating and Stability
Dimensions and Attachment Variations
Power Rating Notes -
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.
To specify an appropriate heatsink use the following formula :
RθH = TMAX - ( P x RθR ) - TA
P
Where: RθH = Thermal Resistance of Heatsink ( K/W )
R
θR = Thermal Resistance of Resistor ( K/W )
T
MAX = Maximum Temperature of Resistor
T
A = Ambient Temperature of Heatsink ( °C )
P = Power Through Resistor ( W )
SPECIFICATIONS (continued)
FPR/FNR 2-T227 FPR/FNR 4-T227
Dimension mm
tol.
(±mm) inches
tol.
(±inches)
A 26 0.5 1.02 0.020
B 38 0.5 1.50 0.020
C 12.7 0.2 0.50 0.008
D 4 0.2 0.16 0.008
E 30 0.2 1.18 0.008
F 15 0.2 0.59 0.008
G 4.1 0.2 0.16 0.008
H 10 0.2 0.39 0.008
I 8 0.2 0.31 0.008
J 4 0.2 0.16 0.008
K 2 0.2 0.08 0.008
L 0.8 0.1 0.03 0.004
M M4 M4
N 10 0.2 0.39 0.008
O 11.9 0.2 0.47 0.008
0
20
40
60
80
100
120
25 50 85 100 115 130
Temperature of the backplate (°C)
Power ( % from
nominal power)
0.1%
0.2%
0.5%
Vishay Precision Group
Document No.: 63999
Revision: 27-Apr-11
www.vishaypg.com
1
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Document No.: 63999
Revision: 27-Apr-11