Current Sensing Amplifiers

Current sensing amplifiers measure current by outputting a voltage that is proportional to the flowing power current. A resistor is used to convert the load current to a small voltage which is then accurately amplified. They offer real-time overcurrent protection.


What are the different applications of current sensing amplifiers?


Accurate current sensing is crucial to optimising performance in a range of applications, such as motor control and power management. In devices where battery or power-line monitoring is highly necessary, like laptops and phones, current sensing amplifiers are critical. 


How to choose the right type of current sensing amplifier


There are several factors that will determine the the type of amplifier you choose, including whether the measurement will be on the high or low side. The sense resistor can be placed either between the supply voltage and load, or between the load and ground. The former is called high-side seinsing, whereas the latter is called low-side sensing. High voltage current sensing amplifiers offer input ranges up to +76V and down to -20V, ideal for applications such as motor control and network routers. Low power current sensing amplifiers help to maximise and extend battery life. 


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Description Price Power Supply Type Typical Single Supply Voltage Typical Dual Supply Voltage Minimum CMRR Number of Channels per Chip Output Type Maximum Supply Current Mounting Type Package Type Pin Count Dimensions Height Length Maximum Operating Supply Voltage
RS Stock No. 823-0079
Mfr. Part No.LTC6102IMS8#PBF
HK$32.52
Each (In a Pack of 2)
units
Single 5 → 100 V - - 1 Rail to Rail 650 μA Surface Mount MSOP 8 3 x 3 x 0.9984mm 0.998mm 3mm 100 V
RS Stock No. 786-1095
Mfr. Part No.MAX4173FESA+
BrandMaxim
HK$12.25
Each (In a Pack of 5)
units
Single 3 → 28 V - 90dB 1 Differential 1 mA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 28 V
RS Stock No. 545-7625
Mfr. Part No.INA194AIDBVT
HK$20.214
Each (In a Pack of 5)
units
Single 3 V, 5 V, 9 V, 12 V, 15 V - 80dB 1 - - Surface Mount SOT-23 5 2.9 x 1.6 x 1.15mm 1.15mm 2.9mm 18 V
New
RS Stock No. 189-8977
Mfr. Part No.MAX9928FAUA+
BrandMaxim
HK$15.184
Each (In a Pack of 5)
units
Single 2.5 → 5.5 V - 93dB 1 Bidirectional, Unidirectional 200 μA Surface Mount μMAX 8 3.05 x 3.05 x 0.95mm 0.95mm 3.05mm 5.5 V
New
RS Stock No. 190-6433
Mfr. Part No.MAX9938FEUK+T
BrandMaxim
HK$16.028
Each (In a Pack of 5)
units
Single 1.6 → 28 V - 94dB 1 Voltage 2.5 μA Surface Mount SOT-23 5 3 x 1.75 x 1.3mm 1.3mm 3mm 28 V
New
RS Stock No. 189-7749
Mfr. Part No.MAX4080TAUA+
BrandMaxim
HK$14.17
Each (In a Tube of 50)
units
Single 4.5 → 76 V - 100dB 1 Rail to Rail 0.19 mA Surface Mount μMAX 8 3.1 x 3.1 x 0.95mm 0.95mm 3.1mm 76 V
New
RS Stock No. 189-8782
Mfr. Part No.MAX4080FASA+
BrandMaxim
HK$16.366
Each (In a Pack of 5)
units
Single 4.5 → 76 V - 100dB 1 Rail to Rail 0.19 mA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 76 V
New
RS Stock No. 190-6395
Mfr. Part No.MAX44284HAUT+T
BrandMaxim
HK$23.634
Each (In a Pack of 5)
units
Single 1.7 → 5.5 V - 91.3dB 1 Voltage 41.5 μA Surface Mount SOT-23 6 3 x 1.75 x 1.3mm 1.3mm 3mm 5.5 V
New
RS Stock No. 189-8726
Mfr. Part No.MAX4080SASA+
BrandMaxim
HK$16.366
Each (In a Pack of 5)
units
Single 4.5 → 76 V - 100dB 1 Rail to Rail 0.19 mA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 76 V
New
RS Stock No. 189-7320
Mfr. Part No.MAX4373TESA+
BrandMaxim
HK$18.359
Each (In a Tube of 100)
units
Single 2.7 → 28 V - 85dB 1 Differential 100 μA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 28 V
New
RS Stock No. 190-4344
Mfr. Part No.MAX44284HAUT+T
BrandMaxim
HK$10.009
Each (On a Reel of 2500)
units
Single 1.7 → 5.5 V - 91.3dB 1 Voltage 41.5 μA Surface Mount SOT-23 6 3 x 1.75 x 1.3mm 1.3mm 3mm 5.5 V
New
RS Stock No. 189-8786
Mfr. Part No.MAX4372FESA+
BrandMaxim
HK$15.184
Each (In a Pack of 5)
units
Single 2.7 → 28 V - - 1 Differential 0.06 mA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 28 V
RS Stock No. 798-5018
Mfr. Part No.MAX4374TEUB+
BrandMaxim
HK$20.191
Each (In a Tube of 50)
units
Single 2.7 → 28 V - 85dB 1 - 50 μA Surface Mount μMAX 10 3 x 3 x 0.95mm 0.95mm 3mm 28 V
New
RS Stock No. 189-8859
Mfr. Part No.MAX4372FEUK+T
BrandMaxim
HK$23.054
Each (In a Pack of 5)
units
Single 2.7 → 28 V - - 1 Differential 0.06 mA Surface Mount SOT-23 5 3 x 1.75 x 1.3mm 1.3mm 3mm 28 V
RS Stock No. 145-6633
Mfr. Part No.AD8213WYRMZ
HK$33.521
Each (In a Tube of 50)
units
Single 5 V - 100dB 2 Buffered 4.5 mA Surface Mount MSOP 10 3.1 x 3.1 x 0.95mm 0.95mm 3.1mm 5.5 V
RS Stock No. 145-7236
Mfr. Part No.AD8417WBRMZ
HK$16.123
Each (In a Tube of 50)
units
Single 5 V - 90dB 1 Buffered 4.1 mA Surface Mount MSOP 8 3.2 x 3.2 x 0.95mm 0.95mm 3.2mm 5.5 V
RS Stock No. 169-0202
Mfr. Part No.SI8920AC-IP
HK$28.848
Each (In a Tube of 50)
units
Single 3 → 5.5 V - - 2 Differential 5.5 mA Through Hole DIP 8 9.9 x 6.6 x 3.44mm 3.44mm 9.9mm 5.5 V
RS Stock No. 145-0965
Mfr. Part No.LT6105CMS8#PBF
HK$13.566
Each (In a Tube of 50)
units
Single 2.85 → 36 V - 120dB 1 Unidirectional 350 μA Surface Mount MSOP 8 3 x 3 x 0.86mm 0.86mm 3mm 36 V
RS Stock No. 825-3088
Mfr. Part No.INA219AIDCNR
HK$14.922
Each (In a Pack of 5)
units
Single 6 V - 100dB 1 Digital 5 mA Surface Mount SOT-23 8 3 x 1.75 x 1.3mm 1.3mm 3mm 5.5 V
RS Stock No. 922-8235
Mfr. Part No.ZXCT1084E5TA
HK$7.201
Each (On a Reel of 3000)
units
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