LR72A, B, C - KOA Speer Electronics

resistors
LR72A, B, C
metal plate current sense resistors
EU
features
•
•
•
•
•
Superior thermal expansion cycling
Inductance less than 10nH
Solderable pads (60/40 SnPb plate)
Lead flexible for thermal expansion
Products with lead-free terminations meet EU RoHS
and China RoHS requirements
dimensions and construction
LR72A
LR72B
Size
Code
a
L
Dimensions inches (mm)
L2 +0.1
W
-.02
t
LR72A
.39±.004
(10.0±0.1)
.079
(2.0)
.20±.008
(5.2±0.2)
.079
(2 Max.)
LR72B
.39±.004
(10.0±0.1)
.079
(2.0)
.118±.008
(3.0±0.2)
.079
(2 Max.)
LR72C
.44±.016
(11.2±0.4)
__
Resistive Plate
.126±.016 .137±.016
(3.2±0.4)
(3.5±0.4)
t
L2
L2
L
LR72C
a
Resistive Plate
t
Solder Coat
L
ordering information
New Part #
LR72
A
Type
Size
A
B
C
D
Termination
Material
D: SnAgCu (LR72C only)
N: CuNi (non-presolder)
(LR72A, B only)
TED
Packaging
TED: LR72A
LR72B
TEB: LR73C
2L0
Nominal
Resistance
2mΩ: 2L0
“L” indicates
the decimal
in milliohms
J
Tolerance
J: ±5%
For further information on packaging,
please refer to Appendix A.
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use.
56
1/24/14
KOA Speer Electronics, Inc. • 199 Bolivar Drive • Bradford, PA 16701 • USA • 814-362-5536 • Fax: 814-362-8883 • www.koaspeer.com
metal plate current sense resistors
applications and ratings
Part
Designation
Power
Rating*
LR72A
1/2W
LR72B
1/4W
LR72C
1W
T.C.R.
(ppm/°C)
Max.
Standard
Resistance**
Resistance
Tolerance
2mΩ ~ 8mΩ
±100
3mΩ ~ 5mΩ
±350
J: ±5%
2mΩ, 3mΩ
Rated
Ambient
Temperature
Operating
Temperature
Range
+70°C
-40°C to +180°C
+85°C
-40°C to +155°C
* Rated power in case of glass epoxy resin (FR-4) is used for the substrate material
** Please contact factory for custom made resistance values
environmental applications
Derating Curve
100
LR72C
% Rated Power
80
60
40
LR72A, 72B
20
0
-40
0
40
80
120
160 200
70 85
155 180
Ambient Temperature
(°C)
For resistors operated at an ambient temperature of 70°C
or above, a power rating shall be derated in accordance
with the above derating curve.
Performance Characteristics
Parameter
Resistance
T.C.R.
Requirement ∆ R ±%
Limit
Typical
Within specified
––
tolerance
Within specified
––
T.C.R.
Test Method
25°C
Room temp. +100°C UP
Resistance to
Soldering Heat
±2.0%
±1.6%
350°C ± 10°C, 3 seconds
Moisture Resistance
±5.0%
±4.5%
Power rating x 1/10, 40°C, 90% - 95% RH, 1000 hours,
1.5 hr ON, 0.5 hr OFF cycle
Endurance at 70°C
±5.0%
±4.5%
Rated voltage 70°C, 1000 hours
1.5 hr ON, 0.5 hr OFF cycle
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use.
12/17/12
KOA Speer Electronics, Inc. • 199 Bolivar Drive • Bradford, PA 16701 • USA • 814-362-5536 • Fax: 814-362-8883 • www.koaspeer.com
57
resistors
LR72A, B, C