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USR4-342510OHMS [RIEDON]

Precision Shunt Resistors; 精密分流电阻
USR4-342510OHMS
型号： USR4-342510OHMS
厂家： RIEDON POWERTRON    RIEDON POWERTRON
描述：

Precision Shunt Resistors
精密分流电阻
文件： 总3页 (文件大小：187K)
中文：  中文翻译
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USR UNR 4-3425 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%  
•ꢀ Backplate Isolated from Leads  
SPECIFICATIONS  
Type  
USR 4-  
3425  
USR 4-  
4020  
UNR 4-  
3425  
UNR 4-  
4020  
Resistance Range  
0.05 to 500 Ohms  
0.05 to 400 Ohms  
other resistance values upon request / power rating depending on resistance value  
Power rating  
free air 70°C  
with heatsink  
3 W  
30 W  
2.5 W  
30 W  
3 W  
50 W  
2.5 W  
50 W  
Thermal Resistance Rthj-c  
Tolerances  
3.5 K/W  
3.6 K/W  
2.1 K/W  
2.2 K/W  
from 0.05 Ohms  
from 10.0 Ohms  
from 50.0 Ohms  
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%  
Stability  
0.01%  
Shelf Life Stability  
25ppm / ∆R after 1 year  
50ppm / ∆R after 3 year  
Temperature Coefficient  
max. ±5ppm/K (-55 to 155°C)  
typ. ±3ppm/K (-55 to 125°C)  
upon request ±1ppm/K (25°C to 60°C)  
Voltage Proof  
max. Current  
Thermal EMF  
Operating Temperature Range  
Resistor Material  
Substrate  
750 VDC  
15 A  
< 0.1µV/K  
-55 to 155°C  
NiCr-Foil  
Al2O3  
AlN  
Housing  
Epoxy + Al-heatsink  
Connector Material  
Terminals  
Cu tinned  
4
Max. Torque  
1.0 Nm  
Notes  
Specially designed for applications with fast  
changing electrical load  
Ordering Information  
Part Description: Part Type - Resistance - Contact - Tolerance - TCR  
Example: USR 4-3425 10Ohms D 0.5% 3ppm  
Riedon Inc.  
300 Cypress Avenue  
Alhambra CA 91801  
www.riedon.com  
(626) 284-9901  
(626) 284-1704  
06/13  
USR UNR 4-3425 3825 3825H 4020  
Precision Shunt Resistors  
SPECIFICATIONS (continued)  
Temperature Coefficient  
800  
600  
400  
200  
0
+5ppm/K  
-5ppm/K  
Nominal Spread  
±2.3ppm/K  
-200  
-400  
-600  
-800  
Nominal ∆R/R  
Nominal Spread  
±2.3ppm/K  
100  
0
25  
50  
75  
125  
-50  
-25  
Temperature (°C)  
Derating  
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 :  
120  
100  
80  
60  
40  
20  
0
RqH = TMAX - ( P x RqR ) - TA  
P
Where: RqH = Thermal Resistance of Heatsink ( K/W )  
RqR = Thermal Resistance of Resistor ( K/W )  
T
MAX = Maximum Temperature of Resistor  
25  
50  
85 100 115 130 145 155  
TA = Ambient Temperature of Heatsink ( °C )  
P = Power Through Resistor ( W )  
Temperature of the backplate(°C)  
Riedon Inc.  
300 Cypress Avenue  
Alhambra CA 91801  
www.riedon.com  
(626) 284-9901  
(626) 284-1704  
06/13  
USR UNR 4-3425 4020  
Precision Shunt Resistors  
SPECIFICATIONS (continued)  
Dimensions  
USR 4-3425 / UNR 4-3425  
tol.  
tol.  
Dimension  
mm  
(±mm)  
inches  
1.97  
(±inches)  
A
B
C
D
E
F
G
H
I
50.00  
34.00  
25.00  
10.00  
5.00  
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  
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  
1.34  
0.98  
0.39  
0.20  
17.80  
Ø3.50  
Ø0.8  
27.50  
17.50  
2.00  
0.70  
Ø0.14  
Ø0.031  
1.08  
J
0.69  
K
L
0.08  
5.50  
0.22  
M
3.00  
0.12  
USR 4-4020 / UNR 4-4020  
tol.  
tol.  
Dimension  
mm  
45.40  
40.00  
20.00  
10.00  
30.00  
20.00  
Ø3.80  
Ø0.8  
5.08  
(±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  
(±inches)  
A
B
C
D
E
F
G
H
I
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  
1.57  
0.79  
0.39  
1.18  
0.79  
Ø0.15  
Ø0.031  
0.20  
J
15.24  
3.00  
0.60  
K
L
0.12  
7.00  
0.28  
M
4.00  
0.16  
Riedon Inc.  
300 Cypress Avenue  
Alhambra CA 91801  
www.riedon.com  
(626) 284-9901  
(626) 284-1704  
06/13  

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