unr2-t220b Riedon Powertron, unr2-t220b Datasheet - Page 2

• Manufacturer Part Number: unr2-t220b
• Description: Precisionshuntresistors
• Manufacturer: Riedon Powertron

Riedon Inc.
USR UNR
USS UNS
Precision Shunt Resistors
120
100
80
60
40
20
0
25
USS 4-T220 / UNS 4-T220
Temperature of the backplate(°C)
-200
-400
-600
-800
800
600
400
200
50
4-T220
4-T220 / T220B
0
300 Cypress Avenue
85
-5ppm/K
-50
100
115
-25
SPECIFICATIONS
130
Temperature Coefficient
0
145
Alhambra CA 91801
www.riedon.com
Temperature (°C)
155
Dimensions
25
Derating
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
qH
Dimension
Dimension
(continued)
75
= T
B
C
D
E
G
H
K
A
F
J
L
I
B
C
D
E
G
A
F
P
MAX
R
T
T
P = Power Through Resistor ( W )
A
MAX
qH
qR
= Ambient Temperature of Heatsink ( °C )
- ( P x R
100
[phone]
= Thermal Resistance of Heatsink ( K/W )
= Thermal Resistance of Resistor ( K/W )
= Maximum Temperature of Resistor
12.70
10.16
14.60
15.00
17.33
mm
0.76
2.54
7.62
4.00
1.20
0.40
1.85
12.10
18.33
11.16
7.62
2.54
1.76
3.20
mm
125
qR
) - T
(±mm)
tol.
0.2
0.2
0.1
0.1
0.1
0.1
0.1
0.2
0.2
0.2
0.1
0.1
inches
0.476
0.439
0.722
0.300
0.100
0.069
0.126
A
Nominal ∆R/R
Nominal Spread
±2.3ppm/K
+5ppm/K
Nominal Spread
±2.3ppm/K
inches
0.50
0.40
0.03
0.10
0.30
0.16
0.05
0.57
0.59
0.68
0.02
0.07
[phone]
(±inches)
0.008
0.008
0.004
0.004
0.004
0.004
0.004
0.008
0.008
0.008
0.004
0.004
tol.
Page 133
rev. 03/2006A