USR4-T220 Datasheet, PDF (1/3 Pages) Willow Technologies Ltd – Highest Stability Near Temperature Independent

USR UNR 4-T220 / T220B
USS UNS 4-T220
Precision Shunt Resistors
Type
Resistance Range
Power rating
free air 70°C
with heatsink
Thermal Resistance Rthj-c
Tolerances
from 0.5 Ohms
from 10.0 Ohms
from 50.0 Ohms
Stability
Shelf Life Stability
Temperature Coefficient
Voltage Proof
Thermal EMF
Operating Temperature Range
Resistor Material
Substrate
Housing
Connector Material
Terminals
Max. Torque
Notes
• Resistances from 0.2Ohm to 80Ohms
• Power Rating to 15Watt
• Resistance Tolerances to ±0.01%
• TCR to ±1ppm/K
• Load Stability to 0.01%
SPECIFICATIONS
USR / USS
0.2 to 80 Ohms
UNR /UNS
1.5W
10W
10.8 K/W
1.5W
15W
6.8 K/W
0.1% / 0.25% / 0.5% / 1%
0.05% / 0.1% / 0.25% / 0.5% / 1%
0.01% / 0.02% / 0.05% / 0.1% / 0.25% / 0.5% / 1%
0.01%
25ppm / ∆R after 1 year
50ppm / ∆R after 3 year
max. ±5ppm/K (-55 to 155°C)
typ. ±3ppm/K (-55 to 125°C)
upon request ±1ppm/K (0 to 60°C)
1 kVDC
< 0.1µV/K
-55 to 155°C
NiCr-Foil
Al₂O₃
AlN
Epoxy + Cu heatsink nickel plated
Cu tinned
4
1.0 Nm
Specially designed for applications with fast
changing electrical load
Ordering Information
Part Number - Resistance - Contact - Tolerance - TCR
UNR 2-T220B 5.7kOhms C 0.5% 3ppm
Riedon Inc.
300 Cypress Avenue
Alhambra CA 91801
[phone]
[phone]
www.riedon.com
Page 132
rev. 03/2006A