For technical questions, contact: powertron@vishaypg.com
USR 4-1414
Powertron
Document Number: 64220
Revision: 20-09-10
www.powertron.de
1
Type USR 4-1414
Resistance Range 0.5 to 100 Ohms
Power rating
free air 70°C
with heatsink
0.8 W
25 W
Thermal Resistance Rthj-c < 4.2 K/W
Tolerances
from 0.5 Ohms
from 1.0 Ohms
0.1% / 0.25% / 0.5% / 1%
0.01% / 0.02% / 0.05% / 0.1% / 0.25% / 0.5% / 1%
Stability 0.01%
Temperature Coefcient max. ±5ppm/K (-55 to 155°C)
typ. ±3ppm/K (-55 to 125°C)
upon request ±1ppm/K (0 to 60°C)
Voltage Proof 1.5 kVDC
Thermal EMF < 0.1µV/K
Operating Temperature Range -55 to 155°C
Resistor Material NiCr-Foil
Substrate Al2O3
upon request: AlN
Housing Plastic / Epoxy
Connector Material Cu tinned
Terminals 4
SPECIFICATIONS
Part Number - Resistance - Tolerance - TCR
USR 4-1414 0.5Ohms 0.5% 1ppm
Ordering Information
Resistances from 0.5Ohm to 100Ohms•
Power Rating to 25Watt•
Resistance Tolerances to ±0.01%•
TCR to ±1ppm/K•
Load Stability to 0.01%•
For technical questions, contact: powertron@vishaypg.com
USR 4-1414
Powertron
Document Number: 64220
Revision: 20-09-10
www.powertron.de
2
0
20
40
60
80
100
120
50 70 85 100 115 130 145 155
Power (% from
nominal power)
Ambient Temperature (°C)
0
20
40
60
80
100
120
25 50 85 100 115 130 145 155
Temperature of the backplate(°C)
Power (% from
nominal power)
Derating
Temperature Coefcient
SPECIFICATIONS (continued)
Dimensions
without Heatsink with Heatsink
Dimension mm
tol.
(±mm) inches
tol.
(±inches)
A 94.00 0.5 3.70 0.020
B 14.00 0.2 0.55 0.008
C 4.50 0.1 0.18 0.004
D Ø0.80 0.1 Ø0.03 0.004
E 6.30 0.2 0.25 0.008
F 1.50 0.2 0.06 0.008
G 14.00 0.2 0.55 0.008
-1500
-1000
-500
0
500
1000
1500
DR/R (ppm)
Temperature (°C)
+4,4 ppm/K
-50
-25 025 50 75 100 125
+5ppm/K
Nominal Spread
±2.3ppm/K
Nominal Spread
±2.3ppm/K
Nominal DR/R
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