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
MYR11.172
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
MYR11.61
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
MYR3.25
Each (In a Pack of 5)
units
- - - - - - - - - - - - - -
RS Stock No. 922-8238
Mfr. Part No.ZXCT1107SA-7
MYR1.395
Each (On a Reel of 3000)
units
- - - - - - - - - - - - - -
RS Stock No. 162-8573
Mfr. Part No.INA219AIDCNR
MYR4.427
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
MYR8.47
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
MYR14.372
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
MYR13.91
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. 817-6580
Mfr. Part No.INA219AID
MYR9.976
Each (In a Pack of 5)
units
Single 3 → 5.5 V - 100dB 1 Bidirectional 1 mA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 5.5 V
RS Stock No. 461-6586
Mfr. Part No.INA169NA/250
MYR10.39
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 60 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. 545-7603
Mfr. Part No.INA193AIDBVT
MYR12.292
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. 145-7636
Mfr. Part No.INA219AID
MYR7.754
Each (In a Tube of 75)
units
Single 3 → 5.5 V - 100dB 1 Bidirectional 1 mA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 5.5 V
RS Stock No. 921-5305
Mfr. Part No.INA226AIDGST
MYR11.006
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. 709-7064
Mfr. Part No.AD8212YRMZ
MYR17.31
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
RS Stock No. 923-3713
Mfr. Part No.INA193AIDBVT
MYR7.08
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
RS Stock No. 742-2889
Mfr. Part No.INA226AIDGST
MYR17.28
Each
units
- - - - - - - Surface Mount MSOP 10 3.1 x 3.1 x 0.95mm 0.95mm 3.1mm -
RS Stock No. 738-5285
Mfr. Part No.ZXCT1110W5-7
MYR3.60
Each (In a Pack of 5)
units
- - - - - - - - - - - - - -
RS Stock No. 122-0319
Mfr. Part No.ZXCT1110W5-7
MYR2.246
Each (On a Reel of 3000)
units
- - - - - - - - - - - - - -
RS Stock No. 811-5807
Mfr. Part No.LMP8640MKE-F/NOPB
MYR9.16
Each (In a Pack of 5)
units
Dual - ±12 V, ±2.7 V, ±5 V 103dB 1 Buffered 800 μA Surface Mount SOT-23 6 3.05 x 1.75 x 1mm 1mm 3.05mm 12 V
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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.
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.
Current Sense Amplifiers accurately amplify small voltages in ...
Description:
Current Sense Amplifiers accurately amplify small voltages in the presence of large common-mode voltage.
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.