USR UNR 4-3425 3825 3825H 4020
Precision Shunt Resistors
•
•
•
•
•
Resistances from 0.05Ohm to 500Ohms
Power Rating to 50Watt
Resistance Tolerances to ±0.01%
TCR to ±1ppm/K
Load Stability to 0.01%
SPECIFICATIONS
Type
Resistance Range
Power rating
free air 70°C
for 3825H
with heatsink
Thermal Resistance Rthj-c
Tolerances
from 0.05 Ohms
from 10.0 Ohms
from 50.0 Ohms
Stability
Shelf Life Stability
Temperature Coefficient
USR 4-
3425 3825
USR 4-
4020
0.05 to 500 Ohms
UNR 4-
3425 3825
UNR 4-
4020
0.05 to 400 Ohms
other resistance values upon request / power rating depending on resistance value
3 W
5 W
30 W
3.5 K/W
2.5 W
30 W
3.6 K/W
3 W
5 W
50 W
2.1 K/W
2.5 W
50 W
2.2 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)
750 VDC
15 A
< 0.1µV/K
-55 to 155°C
NiCr-Foil
Al
2
O
3
Epoxy + Al-heatsink
Cu tinned
4
1.0 Nm
Specially designed for applications with fast
changing electrical load
AlN
Voltage Proof
max. Current
Thermal EMF
Operating Temperature Range
Resistor Material
Substrate
Housing
Connector Material
Terminals
Max. Torque
Notes
Ordering Information
Part Number - Resistance - Contact - Tolerance - TCR
USR 4-3825H 10Ohms D 0.5% 3ppm
Powertron GmbH
Potsdamer Strasse 18a D-14513 Teltow
+49 (0)3328 3530-0
A Riedon Company
www.powertron.de
+49 (0)3328 3530-15
Page 127
rev. 03/2006A
USR UNR
4-3425 3825 3825H 4020
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 Spread
±2.3ppm/K
Nominal ∆R/R
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
USR 4-3425 / UNR 4-3425
tol.
(±mm)
2.0
0.3
0.2
0.2
0.1
0.2
0.1
0.1
0.2
0.2
0.1
0.1
0.2
tol.
(±inches)
0.079
0.012
0.008
0.008
0.004
0.008
0.004
0.004
0.008
0.008
0.004
0.004
0.008
Dimension
A
B
C
D
E
F
G
H
I
J
K
L
M
mm
50.00
34.00
25.00
10.00
5.00
17.80
Ø3.50
Ø0.8
27.50
17.50
2.00
5.50
3.00
inches
1.97
1.34
0.98
0.39
0.20
0.70
Ø0.14
Ø0.031
1.08
0.69
0.08
0.22
0.12
Powertron GmbH
Potsdamer Strasse 18a D-14513 Teltow
+49 (0)3328 3530-0
A Riedon Company
www.powertron.de
+49 (0)3328 3530-15
Page 128
rev. 03/2006A
USR UNR
4-3425 3825 3825H 4020
Precision Shunt Resistors
SPECIFICATIONS
(continued)
USR 4-3825 / UNR 4-3825
tol.
(±mm)
2.0
0.3
0.2
0.1
0.3
0.2
0.1
0.1
0.2
0.2
0.1
0.1
0.1
0.2
0.2
tol.
(±inches)
0.079
0.012
0.008
0.004
0.012
0.008
0.004
0.004
0.008
0.008
0.004
0.004
0.004
0.008
0.008
Dimension
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
mm
49.00
38.00
24.00
4.00
34.00
17.50
1.5x45°
Ø0.8
27.50
17.50
Ø3.2
2.00
5.50
15.00
3.00
inches
1.93
1.50
0.94
0.16
1.34
0.69
0.6x45°
Ø0.031
1.08
0.69
Ø0.126
0.08
0.22
0.59
0.12
USR 4-3825H / UNR 4-3825H
Dimension
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
mm
49.00
38.00
24.00
4.00
34.00
17.50
1.5x45°
Ø0.8
27.50
17.50
Ø3.2
2.00
max.10.3
15.00
3.00
19.00
tol.
(±mm)
2.0
0.3
0.2
0.1
0.3
0.2
0.1
0.1
0.2
0.2
0.1
0.1
0.2
0.2
0.2
0.2
inches
1.93
1.50
0.94
0.16
1.34
0.69
0.6x45°
Ø0.031
1.08
0.69
Ø0.126
0.08
max.0.4
0.59
0.12
0.75
tol.
(±inches)
0.079
0.012
0.008
0.004
0.012
0.008
0.004
0.004
0.008
0.008
0.004
0.004
0.008
0.008
0.008
0.008
USR 4-4020 / UNR 4-4020
Dimension
A
B
C
D
E
F
G
H
I
J
K
L
M
mm
45.40
40.00
20.00
10.00
30.00
20.00
Ø3.80
Ø0.8
5.08
15.24
3.00
7.00
4.00
tol.
(±mm)
2.0
0.3
0.2
0.2
0.2
0.2
0.1
0.1
0.1
0.2
0.1
0.1
0.1
inches
1.79
1.57
0.79
0.39
1.18
0.79
Ø0.15
Ø0.031
0.20
0.60
0.12
0.28
0.16
tol.
(±inches)
0.079
0.012
0.008
0.008
0.008
0.008
0.004
0.004
0.004
0.008
0.004
0.004
0.004
Powertron GmbH
Potsdamer Strasse 18a D-14513 Teltow
+49 (0)3328 3530-0
A Riedon Company
www.powertron.de
+49 (0)3328 3530-15
Page 129
rev. 03/2006A
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