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. 100-3849
Mfr. Part No.INA139NA/250
SGD1.815
Each (On a Reel of 250)
units
Single 3 V, 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V - 100dB 1 - - Surface Mount SOT-23 5 2.9 x 1.6 x 1.15mm 1.15mm 2.9mm 40 V
RS Stock No. 461-6558
Mfr. Part No.INA139NA/250
SGD3.05
Each
units
Single 12 V, 15 V, 18 V, 24 V, 28 V, 3 V, 5 V, 9 V - 100dB 1 - - Surface Mount SOT-23 5 2.9 x 1.6 x 1.15mm 1.15mm 2.9mm 40 V
RS Stock No. 661-2491
Mfr. Part No.INA271AID
SGD3.12
Each
units
Single 12 V, 15 V, 3 V, 5 V, 9 V - 80dB 1 - - Surface Mount SOIC 8 4.9 x 3.91 x 1.58mm 1.58mm 4.9mm 18 V
RS Stock No. 922-3265
Mfr. Part No.INA271AID
SGD2.66
Each (In a Tube of 75)
units
- - - - - - - - - - - - - -
RS Stock No. 162-8573
Mfr. Part No.INA219AIDCNR
SGD2.724
Each (On a Reel of 3000)
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. 660-4841
Mfr. Part No.INA170EA/250
SGD5.27
Each
units
Single 3 V, 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V - 100dB 1 - - Surface Mount MSOP 8 3 x 3 x 0.97mm 0.97mm 3mm 40 V
RS Stock No. 825-3088
Mfr. Part No.INA219AIDCNR
SGD3.182
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. 709-8855
Mfr. Part No.INA219AIDCNT
SGD5.37
Each
units
- - - - - - - Surface Mount SOT-23 8 2.9 x 1.63 x 1.1mm 1.1mm 2.9mm -
RS Stock No. 121-9032
Mfr. Part No.INA170EA/250
SGD3.278
Each (On a Reel of 250)
units
Single 3 V, 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V - 100dB 1 - - Surface Mount MSOP 8 3 x 3 x 0.97mm 0.97mm 3mm 40 V
RS Stock No. 921-5087
Mfr. Part No.INA219AIDCNT
SGD2.42
Each (On a Reel of 250)
units
- - - - - - - Surface Mount SOT-23 8 2.9 x 1.63 x 1.1mm 1.1mm 2.9mm -
RS Stock No. 162-6300
Mfr. Part No.LMP8601MA/NOPB
SGD4.73
Each (In a Tube of 95)
units
Single 5 V - 80dB 1 Bidirectional, Differential, Rail to Rail, Unidirectional 1.3 mA Surface Mount SOIC 8 4.9 x 3.9 x 1.45mm 1.45mm 4.9mm 5.5 V
RS Stock No. 796-8912
Mfr. Part No.AD8211YRJZ-R2
SGD4.07
Each (In a Pack of 5)
units
Single 5 V - 100dB 1 Buffered 2 mA Surface Mount SOT-23 5 3 x 1.7 x 1.3mm 1.3mm 3mm 5.5 V
RS Stock No. 159-9339
Mfr. Part No.AD8211YRJZ-R2
SGD2.70
Each (On a Reel of 250)
units
Single 5 V - 100dB 1 Buffered 2 mA Surface Mount SOT-23 5 3 x 1.7 x 1.3mm 1.3mm 3mm 5.5 V
RS Stock No. 761-6328
Mfr. Part No.LMP8601MA/NOPB
SGD5.27
Each
units
Single 5 V - 80dB 1 Bidirectional, Differential, Rail to Rail, Unidirectional 1.3 mA Surface Mount SOIC 8 4.9 x 3.9 x 1.45mm 1.45mm 4.9mm 5.5 V
RS Stock No. 412-456
Mfr. Part No.AD8210YRZ
SGD6.89
Each
units
Single 5 V - 120 1 Bidirectional - Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 5.5 V
RS Stock No. 824-7086
Mfr. Part No.LMP8645HVMKE/NOPB
SGD4.255
Each (In a Pack of 2)
units
Single 2.7 → 12 V - 95dB 1 Single Ended 2700 μA Surface Mount SOT-23 6 3.05 x 1.75 x 1mm 1mm 3.05mm 12 V
RS Stock No. 545-7603
Mfr. Part No.INA193AIDBVT
SGD3.81
Each (In a Pack of 5)
units
Single 12 V, 15 V, 3 V, 5 V, 9 V - 80dB 1 - - Surface Mount SOT-23 5 2.9 x 1.6 x 1.15mm 1.15mm 2.9mm 18 V
RS Stock No. 912-7163
Mfr. Part No.AD8210YRZ
SGD5.27
Each (In a Tube of 98)
units
Single 5 V - 120 1 Bidirectional - Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 5.5 V
RS Stock No. 121-9732
Mfr. Part No.LMP8645HVMKE/NOPB
SGD2.275
Each (On a Reel of 250)
units
Single 2.7 → 12 V - 95dB 1 Single Ended 2700 μA Surface Mount SOT-23 6 3.05 x 1.75 x 1mm 1mm 3.05mm 12 V
RS Stock No. 923-3713
Mfr. Part No.INA193AIDBVT
SGD2.61
Each (On a Reel of 250)
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
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Current Sensing Amplifiers have a voltage output that ...
Description:
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Current Sensing Amplifiers have a voltage output that ...
Description:
Current Sensing Amplifiers have a voltage output that is proportional to the volt drop across a very low value resistor, usually in a high-current power rail. Hence they measure the current flowing in that power rail.