USR2-T220_13 Datasheet, PDF (1/3 Pages) Riedon Powertron – Precision Foil Resistors

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 Coefficient
Voltage Proof
Thermal EMF
Operating Temperature Range
Resistor Material
Substrate
Housing
Connector Material
Terminals
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 / ∆R after 1 year
50ppm / ∆R 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
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
Riedon Inc.
300 Cypress Avenue Alhambra CA 91801
[phone]
[phone]
www.riedon.com

06/13