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. 165-5536
Mfr. Part No.IR25750LTRPBF
BrandInfineon
R 4.971
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. 879-3375
Mfr. Part No.IR25750LTRPBF
BrandInfineon
R 9.115
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. 865-5699
Mfr. Part No.IR2175PBF
BrandInfineon
R 51.04
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. 165-5474
Mfr. Part No.IR2175PBF
BrandInfineon
R 42.128
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. 178-7428
Mfr. Part No.IR2172SPBF
BrandInfineon
R 83.232
Each (In a Tube of 95)
units
Single 5 V - - 1 Open Drain 2 mA Surface Mount SOIC 8 5 x 4 x 1.75mm 1.75mm 5mm 5 V
RS stock no. 865-5695
Mfr. Part No.IR2172SPBF
BrandInfineon
R 101.57
Each (In a Tube of 2)
units
Single 5 V - - 1 Open Drain 2 mA Surface Mount SOIC 8 5 x 4 x 1.75mm 1.75mm 5mm 5 V