USR UNR USS UNS 4-T220
Powertron
•
•
•
•
•
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
Document Number: 64225
Revision: 20-09-10
For technical questions, contact:
powertron@vishaypg.com
www.powertron.de
1
USR UNR USS UNS 4-T220
Powertron
SPECIFICATIONS
(continued)
Temperature Coefficient
1500
1000
-5ppm/K
+5ppm/K
500
DR/R
(ppm)
0
+4,4 ppm/K
Nominal Spread
±2.3ppm/K
Nominal
DR/R
Nominal Spread
±2.3ppm/K
-500
-1000
-1500
-50
-25
0
50
25
Temperature (°C)
75
100
125
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
www.powertron.de
2
For technical questions, contact:
powertron@vishaypg.com
Document Number: 64225
Revision: 20-09-10
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Vishay Precision Group
Disclaimer
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behalf (collectively, “Vishay Precision Group”), disclaim any and all liability for any errors, inaccuracies or
incompleteness contained herein or in any other disclosure relating to any product.
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purchase, including but not limited to, the warranty expressed therein.
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and conditions of purchase.
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warranties, including warranties of fitness for particular purpose, non-infringement and merchantability.
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Document No.: 63999
Revision: 27-Apr-11
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