USR UNR 4-T220 / T220B
USS UNS 4-T220
Precision Shunt Resistors
•
•
•
•
•
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
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
1.5W
10W
10.8 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
Al
2
O
3
Epoxy + Cu heatsink nickel plated
Cu tinned
4
1.0 Nm
Specially designed for applications with fast
changing electrical load
AlN
USR / USS
0.2 to 80 Ohms
UNR /UNS
1.5W
15W
6.8 K/W
Voltage Proof
Thermal EMF
Operating Temperature Range
Resistor Material
Substrate
Housing
Connector Material
Terminals
Max. Torque
Notes
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
www.riedon.com
(626) 284-9901
(626) 284-1704
Page 132
rev. 03/2006A
USR UNR
4-T220 / T220B
USS UNS
4-T220
Precision Shunt Resistors
SPECIFICATIONS
(continued)
Temperature Coefficient
800
600
+5ppm/K
-5ppm/K
∆R/R (ppm)
400
200
0
-200
-400
-600
-800
-50
-25
0
25
50
75
100
125
Nominal ∆R/R
Nominal Spread
±2.3ppm/K
Nominal Spread
±2.3ppm/K
Temperature (°C)
Derating
Power (% from
nominal power)
120
100
80
60
40
20
0
25
50
85
100
115
130
145
155
Power Rating Notes -
The U-Series Resistors must be attached to a suitable heatsink.
The maximum internal resistor temperature is 155°C.
To specify an appropriate heatsink use the following formula :
R
qH
= T
MAX
- ( P x R
qR
) - T
A
P
Where:
R
qH
= Thermal Resistance of Heatsink ( K/W )
R
qR
= Thermal Resistance of Resistor ( K/W )
T
MAX
= Maximum Temperature of Resistor
T
A
= Ambient Temperature of Heatsink ( °C )
P = Power Through Resistor ( W )
Temperature of the backplate(°C)
Dimensions
USS 4-T220 / UNS 4-T220
Dimension
A
B
C
D
E
F
G
H
I
J
K
L
Dimension
A
B
C
D
E
F
G
mm
12.70
10.16
0.76
2.54
7.62
4.00
1.20
14.60
15.00
17.33
0.40
1.85
mm
12.10
11.16
18.33
7.62
2.54
1.76
3.20
tol.
(±mm)
0.2
0.2
0.1
0.1
0.1
0.1
0.1
0.2
0.2
0.2
0.1
0.1
inches
0.476
0.439
0.722
0.300
0.100
0.069
0.126
inches
0.50
0.40
0.03
0.10
0.30
0.16
0.05
0.57
0.59
0.68
0.02
0.07
tol.
(±inches)
0.008
0.008
0.004
0.004
0.004
0.004
0.004
0.008
0.008
0.008
0.004
0.004
Riedon Inc.
300 Cypress Avenue
Alhambra CA 91801
www.riedon.com
(626) 284-9901
(626) 284-1704
Page 133
rev. 03/2006A
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