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. 169-0204
Mfr. Part No.SI8920BC-IP
MYR14.112
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. 901-3976
Mfr. Part No.Si8920BC-IP
MYR15.71
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. 738-5272
Mfr. Part No.ZXCT1107SA-7
MYR3.35
Each (In a Pack of 5)
units
- - - - - - - - - - - - - -
RS Stock No. 922-8238
Mfr. Part No.ZXCT1107SA-7
MYR1.442
Each (On a Reel of 3000)
units
- - - - - - - - - - - - - -
RS Stock No. 162-8573
Mfr. Part No.INA219AIDCNR
MYR8.545
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. 825-3088
Mfr. Part No.INA219AIDCNR
MYR8.30
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. 169-0202
Mfr. Part No.SI8920AC-IP
MYR16.876
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. 901-3967
Mfr. Part No.Si8920AC-IP
MYR14.46
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. 378-2755
Mfr. Part No.INA138NA/250
MYR8.28
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 36 V
RS Stock No. 100-3828
Mfr. Part No.INA138NA/250
MYR5.253
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 36 V
RS Stock No. 165-9205
Mfr. Part No.MAX4070AUA+
MYR13.235
Each (In a Tube of 50)
units
Single 2.7 → 24 V - 100dB 1 Rail to Rail 0.25 mA Surface Mount μMAX 8 3.05 x 3.05 x 0.95mm 0.95mm 3.05mm 24 V
RS Stock No. 145-7168
Mfr. Part No.AD8212YRMZ
MYR11.00
Each (In a Tube of 50)
units
Single 9 V, 12 V, 15 V, 18 V, 24 V, 28 V - - 1 - 1.5 mA Surface Mount MSOP 8 3 x 3 x 0.85mm 0.85mm 3mm 65 V
RS Stock No. 103-9965
Mfr. Part No.MAX4080SAUA+
MYR18.848
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. 923-6964
Mfr. Part No.MAX4372FEUK+T
MYR8.064
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. 145-7077
Mfr. Part No.INA201AIDGKT
MYR7.33
Each (On a Reel of 250)
units
- - - - - - - Surface Mount MSOP 8 3 x 3 x 0.97mm 0.97mm 3mm -
RS Stock No. 545-7603
Mfr. Part No.INA193AIDBVT
MYR10.144
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. 738-5285
Mfr. Part No.ZXCT1110W5-7
MYR3.528
Each (In a Pack of 5)
units
- - - - - - - - - - - - - -
RS Stock No. 100-3851
Mfr. Part No.INA169NA/250
MYR6.938
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 60 V
RS Stock No. 122-0319
Mfr. Part No.ZXCT1110W5-7
MYR2.246
Each (On a Reel of 3000)
units
- - - - - - - - - - - - - -
RS Stock No. 709-7064
Mfr. Part No.AD8212YRMZ
MYR14.36
Each
units
Single 12 V, 15 V, 18 V, 24 V, 28 V, 9 V - - 1 - 1.5 mA Surface Mount MSOP 8 3 x 3 x 0.85mm 0.85mm 3mm 65 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.