USS UNS 4-T220
Powertron
FEATURES
•
•
•
•
•
Resistances from 0.2Ohm to 80Ohms
Power Rating to 15Watt
Resistance Tolerances to ±0.01%
TCR to ±1ppm/K
Load Stability to 0.01%
TABLE 1—SPECIFICATIONS
TYPE
Resistance Range
Power Rating
Free air 70°C
With heatsink
1.5W
10W
USS 4-T220
0.2 to 80 Ohms
1.5W
15W
UNS 4-T220
Tolerances
from 0.5 Ohms
from 10.0 Ohms
from 50.0 Ohms
Thermal Resistance
Stability (1000h)
Shelf Life Stability
Temperature Coefficient
Voltage Proof
Thermal EMF
Operating Temperature Range
Resistor Material
Substrate
Housing
Connector Material
Terminals
Soldering temperature
Notes
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%
10.8 K/W
6.8 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)
upon request ±1ppm/K (25 to 60°C)
1 kVDC
< 0.1µV/K
-55 to 155°C
NiCr-Foil
Al
2
O
3
PPS + Cu heatsink nickel plated
Cu / tinned
4
210°C <30 seconds
other versions upon request
Specially designed for ap-
plications with fast changing
electrical load
AlN
ORDERING INFORMATION
Part Number - Resistance - Tolerance - TCR
USS 2-T220 5.7kOhms 0.5% 3ppm
Document No.: 64235
Revision: 24-04-2013
For technical questions,
contact
powertron@vishaypg.com
www.powertron.de
1
USS UNS 4-T220
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 -
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 heatsink.
The maximum internal resistor temperature is 155°C.
To specify an appropriate heatsink use the following formula :
Power (% from
nominal power)
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)
FIGURE 3—DIMENSIONS
in mm (inches)
Dimension
A
±0.2 (±0.008)
B
±0.2 (±0.008)
C
±0.1 (±0.004)
D
±0.1 (±0.004)
E
±0.1 (±0.004)
F
±0.1 (±0.004)
G
±0.1 (±0.004)
H
±0.2 (±0.008)
I
±0.2 (±0.008)
J
±0.2 (±0.008)
K
±0.1 (±0.004)
L
±0.1 (±0.004)
12.70 (0.50)
10.16 (0.40)
0.76 (0.03)
2.54 (0.10)
7.62 (0.30)
4.00 (0.16)
1.20 (0.05)
14.60 (0.57)
15.00 (0.59)
17.33 (0.68)
0.40 (0.20)
1.85 (0.07)
Dimension
A
B
C
D
E
F
G
12.10 (0.476)
11.16 (0.439)
18.33 (0.722)
7.62 (0.300)
2.54 (0.100)
1.76 (0.069)
3.20 (0.126)
www.powertron.de
2
For technical questions,
contact
powertron@vishaypg.com
Document No.: 64235
Revision: 24-04-2013
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