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. 190-4303
Mfr. Part No.MAX4080TASA+T
€1.253
Each (On a Reel of 2500)
units
Single 4.5 → 76 V - 100dB 1 Voltage 190 μA Surface Mount SO 8 5 x 4 x 1.5mm 1.5mm 5mm 76 V
RS Stock No. 189-7368
Mfr. Part No.MAX9929FAUA+
€1.455
Each (In a Tube of 50)
units
Single - - 87dB 2 Bidirectional, Unidirectional 20 μA Surface Mount μMAX 8 3.1 x 3.1 x 0.95mm 0.95mm 3.1mm 5.5 V
RS Stock No. 189-8799
Mfr. Part No.MAX4080TASA+
€2.012
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
RS Stock No. 189-7289
Mfr. Part No.MAX4372FEUK+T
€1.097
Each (On a Reel of 2500)
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. 190-4304
Mfr. Part No.MAX4081FASA+
€1.763
Each (In a Tube of 100)
units
Single 4.5 → 76 V - 100dB 1 Voltage 190 μA Surface Mount SO 8 5 x 4 x 1.5mm 1.5mm 5mm 76 V
RS Stock No. 732-7888
Mfr. Part No.MAX4080SASA+
€2.01
Each
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
RS Stock No. 190-6365
Mfr. Part No.MAX4376TAUK+T
€8.47
1 Pack of 5
Pack(s)
Single 3 → 28 V - 90dB 1 Buffered 2.2 mA Surface Mount SOT-23 5 3 x 1.75 x 1.3mm 1.3mm 3mm 28 V
RS Stock No. 190-6285
Mfr. Part No.MAX4172EUA+
€15.83
1 Pack of 5
Pack(s)
Single 3 → 32 V - - 1 Unidirectional 1.6 mA Surface Mount μMAX 8 3.1 x 3.1 x 0.95mm 0.95mm 3.1mm 32 V
RS Stock No. 190-6395
Mfr. Part No.MAX44284HAUT+T
€10.00
1 Pack of 5
Pack(s)
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
RS Stock No. 189-9010
Mfr. Part No.MAX9929FAUA+
€1.716
Each (In a Pack of 5)
units
Single - - 87dB 2 Bidirectional, Unidirectional 20 μA Surface Mount μMAX 8 3.1 x 3.1 x 0.95mm 0.95mm 3.1mm 5.5 V
RS Stock No. 190-4331
Mfr. Part No.MAX4376TAUK+T
€1.097
Each (On a Reel of 2500)
units
Single 3 → 28 V - 90dB 1 Buffered 2.2 mA Surface Mount SOT-23 5 3 x 1.75 x 1.3mm 1.3mm 3mm 28 V
RS Stock No. 189-7306
Mfr. Part No.MAX4173FEUT+T
€1.601
Each (On a Reel of 2500)
units
Single 3 → 28 V - 90dB 1 - 1 mA Surface Mount SOT-23 6 3 x 1.75 x 1.3mm 1.3mm 3mm 28 V
RS Stock No. 923-7917
Mfr. Part No.MAX4080SASA+
€1.508
Each (In a Tube of 100)
units
- - - - - - - - - - - - - -
RS Stock No. 190-4375
Mfr. Part No.MAX9634TEUK+T
€0.738
Each (On a Reel of 2500)
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
RS Stock No. 190-4305
Mfr. Part No.MAX4081SASA+
€1.81
Each (In a Tube of 100)
units
Single 4.5 → 76 V - 100dB 1 Voltage 190 μA Surface Mount SO 8 5 x 4 x 1.5mm 1.5mm 5mm 76 V
RS Stock No. 786-1114
Mfr. Part No.MAX4373FESA+
€2.565
Each (In a Pack of 2)
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
RS Stock No. 165-9191
Mfr. Part No.MAX4080TAUA+
€1.654
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
RS Stock No. 732-7882
Mfr. Part No.MAX4080SAUA+
€1.93
Each
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
RS Stock No. 190-4298
Mfr. Part No.MAX4071AUA+
€1.466
Each (In a Tube of 50)
units
Single 2.7 → 24 V - 100dB 1 Bidirectional 250 μA Surface Mount μMAX 8 3.1 x 3.1 x 0.95mm 0.95mm 3.1mm 24 V
RS Stock No. 190-6296
Mfr. Part No.MAX4173HESA+
€16.24
1 Pack of 10
Pack(s)
Single 3 → 28 V - 90 (Typ.)dB 1 Voltage 1 mA Surface Mount SO 8 5 x 4 x 1.5mm 1.5mm 5mm 28 V