73M1 Series
Current Sensing Resistor – 1 Watt
Features
Metal Plate Construction – Copper Alloy
1 Watt Power Rating @ +70°C
Resistance Range 3 – 100 milliohms
Operating Temperature to +180°C
Surface Mount Package
Terminal Finish – Matte Tin [e3]
Reflow Capable per JEDEC J-STD-020, +260°C Maximum
Tape and Reel Packaging
Applications
Motor Control
Power Supply
Hard Disk Drives
Current Detection
Current Limiting
Regulated Battery Circuits
Inverter/Converter
Industrial Equipment
Infotainment Systems
Description
73M1 Series Current Sensing Resistor is a metal plate packaged device that provides excellent accuracy for
current detection. Each resistor has good electrical and thermal characteristics by using a special metallic resistor
material.
Ordering Information
Model
73M
1
Type
Code
1
Watt
Rating
1
Resistor
Value
R050
Resistor
Tolerance
F
Code
G
F
Tolerance
±2%
±1%
Code Resistor Value *
R050 0.050 ohms
* See Addendum for Standard EIA Values and Codes
Notes:
1. No dashes or spaces to appear in part number.
Not all performance combinations and resistor values may be available.
Contact your local CTS Representative or CTS Customer Service for availability.
This product is specified for use only in standard commercial applications. Supplier disclaims all
express and implied warranties and liability in connection with any use of this product in any noncommercial applications or in any application that may expose the product to conditions that are
outside of the tolerances provided in its specification.
DOC# 008-0336-0 Rev. C
Page 1 of 5
©2017 CTS® Corporation. Information/product(s) subject to change. No warranty that product(s) will meet the stated specifications for customer specific applications or test
equipment. Visit www.ctscorp.com for list of applicable patent(s), more information, or to request a quote.
73M1 Series
Current Sensing Resistor – 1 Watt
Ordering Information
Part Number Examples
4 -Digit Code
Toleranc e /
Value
G
[±2 %]
F
[±1 %]
5 m O hms
73M1R005G
73M1R005G
8 m O hms
73M1R008G
73M1R008G
1 5 m O hms
---
73M1R015F
1 0 0 m O hms
---
73M1R100F
Electrical & Environmental Specifications
Operating Conditions
Model
Type
Rated
P ower
[Watts]
7 3 M1
1.0
Resistanc e
Range
[ohms]
Resistanc e
Toleranc e
[%]
0.003 - 0.009
±1, ±2
0.010 - 0.100
±1
Temperature
Coeffic ient
Rated Ambient
Temperature
O perating
Temperature
Range
0.003Ω ≤ R < 0.005Ω: ±300ppm/°C
0.005Ω ≤ R < 0.010Ω: ±180ppm/°C
0.010Ω ≤ R ≤ 0.100Ω: ±100ppm/°C
+70°C
-55°C to +180°C
Power Derating Curve – Typical
With the rated ambient temperature set to +70°C, the maximum power [maximum current for 0Ω product] at a temperature of no more
than rated ambient temperature shall be equal to the rated power [rate current for 0Ω product]. The maximum power at a temperature
exceeding the rated ambient temperature shall be a value determined by reducing the rated power according to the power reduction
curve in the figure below.
Rated Power Ratio [%]
100
80
60
40
20
0
-55
0
+70
+180
Ambient Temperature [°C]
Rated Voltage
The rated voltage shall be the DC or AC [effective power frequency] voltage corresponding to the rated power and shall be determined
with the formula shown below. If the determined rated voltage exceeds the maximum operating voltage specified in Operating Conditions
table, the maximum operating voltage shall be the rated voltage.
E = Rated Voaltge [V]
E = √ PxR
P = Rated Power [W]
R = Nomimal Resistance [Ω]
DOC# 008-0336-0 Rev. C
Page 2 of 5
©2017 CTS® Corporation. Information/product(s) subject to change. No warranty that product(s) will meet the stated specifications for customer specific applications or test
equipment. Visit www.ctscorp.com for list of applicable patent(s), more information, or to request a quote.
73M1 Series
Current Sensing Resistor – 1 Watt
Electrical & Environmental Specifications
Environmental Parameters
Maximum Delta R [%]
7 3 M1
Test
Test Desc ription
Short Time O verload
±0.5
2 times rated working voltage for 5 seconds
Moisture Resistanc e
±2.0
1,000 hours @ +40°C, 95% RH, cycle 1.5h ON & 0.5h OFF
Load Life
±2.0
1,000 hours @ +70°C, rated load, cycle 1.5h ON & 0.5h OFF
Resistanc e to Solder Heat
±0.5
5 seconds @ +260°C solder
Mechanical Specifications
Package Drawing/Dimensions
Dimensions
[mm]
Model
Type
7 3 M1
L
W
t
a
b
c /d
6.2 ±0.3
3.1 ±0.2
1.2 Max.
2.5 ±0.2
0.8 ±0.2
1.2 ±0.3
Notes
1. Terminal Details
Base Metal – Copper [Cu] 80m Ohm < R and Brass R ≤ 80m Ohm
Barrier Plating – Nickel [Ni]
Finish Plating – Matte Tin [Sn]
Recommended Pad Layout
Model
Type
7 3 M1
A
Dimensions
[mm]
B
C
3.30
7.50
3.10
DOC# 008-0336-0 Rev. C
Page 3 of 5
©2017 CTS® Corporation. Information/product(s) subject to change. No warranty that product(s) will meet the stated specifications for customer specific applications or test
equipment. Visit www.ctscorp.com for list of applicable patent(s), more information, or to request a quote.
73M1 Series
Current Sensing Resistor – 1 Watt
Mechanical Specifications
Marking Information
Model
Type
P art Marking
1 Rxxx = "R" is the decimal point and 3 digits [E24] are significant values.
See resistor tables for codes.
2 t = Tolerance; F = 1% & G = 2%.
Rxxx
tZYM
7 3 M1
3 Z = Product type.
4 YM = Date Code.
Y = Year
M = Month; 1 - 9 is for January through September,
O, N and D for October through December respectively.
Packaging
Tape and Reel Information
Embossed Tape
Model
Type
7 3 M1
A
3.5 ±0.1
Reel
[mm]
B
C
6.6 ±0.1
12.0 ±0.2
D
5.5 ±0.1
E
1.75 ±0.10
F
8.0 ±0.1
G
2.0 ±0.1
H
4.0 ±0.1
J
1.5 ±0.2
K
+0.1
1.5
-0.0
L
M
1.3 ±0.1
0.30 ±0.05
[mm]
Model
Type
Q uantity
P er Reel
A
7 3 M1
1,000
15.4
DOC# 008-0336-0 Rev. C
Page 4 of 5
©2017 CTS® Corporation. Information/product(s) subject to change. No warranty that product(s) will meet the stated specifications for customer specific applications or test
equipment. Visit www.ctscorp.com for list of applicable patent(s), more information, or to request a quote.
73M1 Series
Current Sensing Resistor – 1 Watt
Addendum
Standard EIA Codes and Resistor Values – E-24 [4-Digit Resistor Code for G&F Tolerances]
CO DE
O HMS
CO DE
O HMS
CO DE
O HMS
CO DE
O HMS
R003
0.003
R013
0.013
R036
0.036
R068
0.068
R004
0.004
R015
0.015
R039
0.039
R075
0.075
R005
0.005
R016
0.016
R040
0.040
R082
0.082
R006
0.006
R018
0.018
R043
0.043
R091
0.091
R007
0.007
R020
0.020
R047
0.047
R100
0.100
R008
0.008
R022
0.022
R050
0.050
R009
0.009
R024
0.024
R051
0.051
R010
0.010
R027
0.027
R056
0.056
R011
0.011
R030
0.030
R062
0.062
R012
0.012
R033
0.033
R067
0.067
DOC# 008-0336-0 Rev. C
Page 5 of 5
©2017 CTS® Corporation. Information/product(s) subject to change. No warranty that product(s) will meet the stated specifications for customer specific applications or test
equipment. Visit www.ctscorp.com for list of applicable patent(s), more information, or to request a quote.
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