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USR2C-7K5B8 Datasheet, PDF (1/3 Pages) Riedon Powertron – Precision Foil Resistors | |||
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USR UNR 2-T220 / T220B / T221
USS UNS 2-T220
Precision Foil Resistors
⢠Resistances from 0.5Ohm to 150kOhms
⢠Power Rating to 10Watt
⢠Resistance Tolerances to ±0.01%
⢠TCR to ±3ppm/K
⢠Load Stability to 0.01%
⢠TO-220 Housing
⢠Convenient SMD D2Pak Available
SPECIFICATIONS
Type
Resistance Range
Power rating
free air 70°C (R<50R0)
free air 70°C (R>50R0)
with heatsink (R<50R0)
with heatsink (R>50R0)
Thermal Resistance Rthj-c
R<50R0
R>50R0
Tolerances
from 0.5 Ohms
from 10.0 Ohms
from 25.0 Ohms
from 50.0 Ohms
Stability
Shelf Life Stability
Temperature Coefï¬cient
Voltage Proof
Thermal EMF
Operating Temperature Range
Resistor Material
Substrate
Housing
Connector Material
Terminals
Soldering Temperature
Max. Torque
Notes
USR / USS
0.5 Ohms to 150 kOhms
UNR /UNS
0.5 Ohms to 5 kOhms
1.5W
1.0W
10W
6W
1.5W
1.0W
15W
10W
10.8 K/W
18.8 K/W
6.8 K/W
10.8 K/W
0.1% / 0.25% / 0.5% / 1%
0.05% / 0.1% / 0.25% / 0.5% / 1%
0.02% / 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 / âR after 1 year
50ppm / âR after 3 year
max. ±5ppm/K (-55 to 155°C)
typ. ±3ppm/K (-55 to 125°C)
1 kVDC
< 0.1µV/K
-55 to 155°C
NiCr-Foil
Al2O3
AlN
Epoxy + Cu heatsink nickel plated
Cu tinned
2
210°C <30 seconds
other versions upon request
1.0 Nm
Specially designed for applications with fast
changing electrical load
Ordering Information
Part Description: Part Type - Resistance - Contact - Tolerance - TCR
Example: UNR 2-T220B 5.7kOhms C 0.5% 3ppm
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