unr4-3825h Riedon Powertron, unr4-3825h Datasheet - Page 2

• Manufacturer Part Number: unr4-3825h
• Description: Precisionshuntresistors
• Manufacturer: Riedon Powertron

Riedon Inc.
USR UNR
Precision Shunt Resistors
120
100
80
60
40
20
0
25
Temperature of the backplate(°C)
50
4-3425 3825 3825H 4020
-200
-400
-600
-800
300 Cypress Avenue
800
600
400
200
85
0
-5ppm/K
100
-50
115
SPECIFICATIONS
-25
130
Temperature Coefficient
USR 4-3425 / UNR 4-3425
145
Alhambra CA 91801
www.riedon.com
0
155
Dimensions
Derating
Temperature (°C)
25
50
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
Where: R
Dimension
qH
(continued)
= T
C
D
G
H
M
A
B
E
F
J
K
L
I
75
P
MAX
R
T
T
P = Power Through Resistor ( W )
A
MAX
qH
qR
= Ambient Temperature of Heatsink ( °C )
- ( P x R
= Thermal Resistance of Heatsink ( K/W )
= Thermal Resistance of Resistor ( K/W )
[phone]
= Maximum Temperature of Resistor
Ø3.50
50.00
34.00
25.00
10.00
17.80
27.50
17.50
Ø0.8
5.00
2.00
5.50
3.00
mm
100
qR
(±mm)
) - T
tol.
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
125
A
Ø0.031
inches
Ø0.14
1.97
1.34
0.98
0.39
0.20
0.70
1.08
0.69
0.08
0.22
0.12
Nominal ∆R/R
Nominal Spread
±2.3ppm/K
+5ppm/K
Nominal Spread
±2.3ppm/K
[phone]
(±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
tol.
Page 128
rev. 03/2006A