USR UNR 2-T220 T221
Powertron
FEATURES
•
•
•
•
•
•
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
TABLE 1—SPECIFICATIONS
TYPE
Resistance Range
Free air 70°C
R < 50R0
R > 50R0
With heatsink
R < 50R0
R > 50R0
USR 2-T220
USR 2-T221
0.5 Ohms to 150 kOhms
1.5W
1.0W
10W
6W
UNR 2-T220
UNR 2-T221
0.5 Ohms to 5 kOhms
1.5W
1.0W
15W
10W
Power Rating
Tolerances
from 0.5 Ohms
from 10.0 Ohms
from 25.0 Ohms
from 50.0 Ohms
Thermal Resistance Rthj-c
R<50R0
R>50R0
Stability (1000h)
Shelf Lifw Stability
Temperature Coefficient
Voltage Proof
Thermal EMF
Operating Temperature Range
Resistor Material
Substrate
Housing
Connector Material
Terminals
Max. Torque
Notes
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%
10.8 K/W
18.8 K/W
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
Al
2
O
3
Cu / tinned
2
1.0 Nm
Specially designed for ap-
plications with fast changing
electrical load
AlN
Epoxy + Cu heatsink nickel plated
6.8 K/W
10.8 K/W
ORDERING INFORMATION
Part Number - Resistance - Contact - Tolerance - TCR
UNR 2-T220B 4.7kOhms C 0.5% 3ppm
Document No.: 64222
Revision: 24-04-2013
For technical questions,
contact
powertron@vishaypg.com
www.powertron.de
1
USR UNR 2-T220 T221
Powertron
FIGURE 1—TEMPERATURE COEFFICIENT
200
100
0
∆R/R
(ppm)
-100
-200
-300
-400
-500
-600
-700
-75
-50
-25
0
25
50
Temperature (°C)
75
100
125
Nominal Spread
±2.3ppm/K
150
Nominal
∆R/R
Nominal Spread
±2.3ppm/K
FIGURE 2—DERATING
Power Rating Notes -
Power (% from
nominal power)
120
100
80
60
40
20
0
25
50
85
100
115
130
145
155
The U-Series Resistors must be attached to a suitable heat-
sink. 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)
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For technical questions,
contact
powertron@vishaypg.com
Document No.: 64222
Revision: 24-04-2013
USR UNR 2-T220 T221
Powertron
FIGURE 3—DIMENSIONS
in mm (inches)
USR 2-T220 / UNR 2-T220
Dimension
A
±0.2 (±0.008)
B
±0.2 (±0.008)
C
±0.1 (±0.004)
D
±0.1 (±0.004)
E
±0.2 (±0.008)
F
±0.1 (±0.004)
G
±0.1 (±0.004)
H
±0.1 (±0.004)
I
±0.2 (±0.008)
J
±0.1 (±0.004)
K
±0.1 (±0.004)
L
±0.1 (±0.004)
M
±0.1 (±0.004)
N
±0.1 (±0.004)
O
±0.1 (±0.004)
Standard
contact
C-contact
17.30 (0.68)
10.16 (0.40)
6.00 (0.24)
Ø3.7 (Ø0.146)
16.40 (0.65)
5.08 (0.20)
0.76 (0.03)
1.30 (0.05)
10.00 (0.39) 13.80 (0.54)
2.00 (0.08)
1.20 (0.05)
4.00 (0.16)
2.90 (0.11)
0.40 (0.02)
1.85 (0.07)
USR 2-T221 / UNR 2-T221
Dimension
A
±0.2 (±0.008)
B
±0.2 (±0.008)
C
±0.1 (±0.004)
D
±0.1 (±0.004)
E
±0.2 (±0.008)
F
±0.1 (±0.004)
G
±0.1 (±0.004)
H
±0.1 (±0.004)
I
±0.2 (±0.008)
J
±0.1 (±0.004)
K
±0.1 (±0.004)
L
±0.1 (±0.004)
M
±0.1 (±0.004)
N
±0.1 (±0.004)
O
±0.1 (±0.004)
Standard
contact
C-contact
18.30 (0.72)
10.16 (0.40)
3.70 (0.15)
Ø3.2 (Ø0.126)
16.40 (0.65)
5.08 (0.20)
0.76 (0.03)
1.30 (0.05)
10.00 (0.39) 13.80 (0.54)
2.00 (0.08)
1.20 (0.05)
4.00 (0.16)
3.90 (0.15)
0.40 (0.02)
1.85 (0.07)
Document No.: 64222
Revision: 24-04-2013
For technical questions,
contact
powertron@vishaypg.com
www.powertron.de
3
Legal Disclaimer Notice
Vishay Precision Group
Disclaimer
ALL PRODUCTS, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE.
Vishay Precision Group, Inc., its affiliates, agents, and employees, and all persons acting on its or their
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.
The product specifications do not expand or otherwise modify Vishay Precision Group’s terms and
conditions of purchase, including but not limited to, the warranty expressed therein.
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and conditions of purchase.
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Group disclaims (i) any and all liability arising out of the application or use of any product, (ii) any and
all liability, including without limitation special, consequential or incidental damages, and (iii) any and
all implied warranties, including warranties of fitness for particular purpose, non-infringement and
merchantability.
Information provided in datasheets and/or specifications may vary from actual results in different
applications and performance may vary over time. Statements regarding the suitability of products for
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particular product with the properties described in the product specification is suitable for use in a particular
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Document No.: 63999
Revision: 27-Apr-2011
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