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. 921-5305
Mfr. Part No.INA226AIDGST
€1.938
Each (On a Reel of 250)
units
- - - - - - - Surface Mount MSOP 10 3.1 x 3.1 x 0.95mm 0.95mm 3.1mm -
RS Stock No. 742-2889
Mfr. Part No.INA226AIDGST
€2.78
Each
units
- - - - - - - Surface Mount MSOP 10 3.1 x 3.1 x 0.95mm 0.95mm 3.1mm -
RS Stock No. 922-3322
Mfr. Part No.INA200AIDGKT
€1.468
Each (On a Reel of 250)
units
- - - - - - - - - - - - - -
RS Stock No. 121-6917
Mfr. Part No.AD8418WBRZ
€1.833
Each (In a Tube of 98)
units
Single 5 V - 90dB 1 Bidirectional 130 μA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 5.5 V
RS Stock No. 661-3352
Mfr. Part No.INA200AIDGKT
€2.346
Each (In a Pack of 5)
units
- - - - - - - Surface Mount MSOP 8 3 x 3 x 0.97mm 0.97mm 3mm -
RS Stock No. 820-9797
Mfr. Part No.AD8418WBRZ
€2.296
Each (In a Pack of 7)
units
Single 5 V - 90dB 1 Bidirectional 130 μA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 5.5 V
RS Stock No. 879-3375
Mfr. Part No.IR25750LTRPBF
BrandInfineon
€0.545
Each (In a Pack of 10)
units
Single -5 → 600 V - - 1 Single Ended - Surface Mount SOT-23 5 3 x 1.75 x 1.3mm 1.3mm 3mm 600 V
RS Stock No. 922-8241
Mfr. Part No.ZXCT1087E5TA
€0.607
Each (On a Reel of 3000)
units
- - - - - - - - - - - - - -
RS Stock No. 160-9848
Mfr. Part No.AD8418AWBRMZ
€1.94
Each (In a Tube of 50)
units
Single 5 V - 90dB 1 Bidirectional 130 μA Surface Mount MSOP 8 3.2 x 3.2 x 0.95mm 0.95mm 3.2mm 5.5 V
RS Stock No. 165-5536
Mfr. Part No.IR25750LTRPBF
BrandInfineon
€0.278
Each (On a Reel of 3000)
units
Single -5 → 600 V - - 1 Single Ended - Surface Mount SOT-23 5 3 x 1.75 x 1.3mm 1.3mm 3mm 600 V
RS Stock No. 165-5474
Mfr. Part No.IR2175PBF
BrandInfineon
€2.401
Each (In a Tube of 50)
units
Single 5 V - - 1 Open Drain 0.5 mA Through Hole PDIP 8 5 x 4 x 1.75mm 1.75mm 5mm 5 V
RS Stock No. 738-5279
Mfr. Part No.ZXCT1087E5TA
€1.296
Each (In a Pack of 5)
units
- - - - - - - - - - - - - -
RS Stock No. 412-456
Mfr. Part No.AD8210YRZ
€4.04
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. 912-7163
Mfr. Part No.AD8210YRZ
€3.213
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. 901-3976
Mfr. Part No.Si8920BC-IP
€3.495
Each (In a Pack of 2)
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. 162-8172
Mfr. Part No.INA3221AIRGVT
€3.119
Each (On a Reel of 250)
units
Single 2.7 → 5.5 V - 110dB 1 Open Drain 450 μA Surface Mount VQFN 16 4.15 x 4.15 x 0.95mm 0.95mm 4.15mm 5.5 V
RS Stock No. 865-5699
Mfr. Part No.IR2175PBF
BrandInfineon
€3.035
Each (In a Tube of 2)
units
Single 5 V - - 1 Open Drain 0.5 mA Through Hole PDIP 8 5 x 4 x 1.75mm 1.75mm 5mm 5 V
RS Stock No. 817-6619
Mfr. Part No.INA3221AIRGVT
€3.47
1 Tape of 1
Tape(s)
Single 2.7 → 5.5 V - 110dB 1 Open Drain 450 μA Surface Mount VQFN 16 4.15 x 4.15 x 0.95mm 0.95mm 4.15mm 5.5 V
RS Stock No. 545-7647
Mfr. Part No.INA196AIDBVT
€2.576
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
RS Stock No. 545-7603
Mfr. Part No.INA193AIDBVT
€2.576
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
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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.
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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.