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. 709-7076
Mfr. Part No.AD8215YRZ
kr 26,02
Each
Units
Single 5 V - 80dB 1 - - Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 5.5 V
RS Stock No. 159-7872
Mfr. Part No.AD8215YRZ
kr 21,026
Each (In a Tube of 98)
Units
Single 5 V - 80dB 1 - - Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 5.5 V
RS Stock No. 145-1310
Mfr. Part No.LT1999IMS8-20#PBF
kr 36,225
Each (In a Tube of 50)
Units
Single 4.5 5.5 V - 80dB 1 Buffered, Rail to Rail 7.1 mA Surface Mount MSOP 8 3 x 3 x 0.9984mm 0.998mm 3mm 5.5 V
RS Stock No. 155-5368
Mfr. Part No.LT2940IMS#PBF
kr 36,878
Each (In a Tube of 37)
Units
Single 80 V - - 1 Bidirectional 5 mA Surface Mount MSOP 12 4.039 x 3 x 0.86mm 0.86mm 4.04mm 80 V
RS Stock No. 764-8744
Mfr. Part No.AD8218BRMZ
kr 23,93
Each
Units
Single 4 → 80 V - 90dB 1 Rail to Rail 60 μA Surface Mount MSOP 8 3.2 x 3.2 x 0.95mm 0.95mm 3.2mm 80 V
RS Stock No. 779-9568
Mfr. Part No.LT2940IMS#PBF
kr 52,14
Each
Units
Single 80 V - - 1 Bidirectional 5 mA Surface Mount MSOP 12 4.039 x 3 x 0.86mm 0.86mm 4.04mm 80 V
RS Stock No. 912-9914
Mfr. Part No.AD8218BRMZ
kr 17,33
Each (In a Tube of 50)
Units
Single 4 → 80 V - 90dB 1 Rail to Rail 60 μA Surface Mount MSOP 8 3.2 x 3.2 x 0.95mm 0.95mm 3.2mm 80 V
RS Stock No. 822-5844
Mfr. Part No.LT1999IMS8-20#PBF
kr 45,415
Each (In a Pack of 2)
Units
Single 4.5 5.5 V - 80dB 1 Buffered, Rail to Rail 7.1 mA Surface Mount MSOP 8 3 x 3 x 0.9984mm 0.998mm 3mm 5.5 V
RS Stock No. 851-6828
Mfr. Part No.LT6108IMS8-2#PBF
kr 31,566
Each (In a Pack of 5)
Units
Single 2.7 60 V - 125dB 1 Open Drain 450 μA Surface Mount MSOP 8 3 x 3 x 0.86mm 0.86mm 3mm 60 V
RS Stock No. 154-7664
Mfr. Part No.LTC6101BCS5#TRMPBF
kr 21,216
Each (On a Reel of 500)
Units
Single 4 60 V 4 60V - 1 Unidirectional 0.64 mA Surface Mount TSOT-23 5 2.9 x 1.75 x 0.9mm 0.9mm 2.9mm 60 V
RS Stock No. 779-9482
Mfr. Part No.LT1787CS8#PBF
kr 43,47
Each (In a Pack of 2)
Units
Single 36 V - - 1 Bidirectional, Unidirectional 60 μA Surface Mount SOIC 8 5.004 x 3.988 x 1.498mm 1.498mm 5mm 36 V
RS Stock No. 160-9876
Mfr. Part No.AD8418ABRMZ-RL
kr 13,729
Each (On a Reel of 3000)
Units
Single 5 V - 90dB 1 Buffered 4.1 mA Surface Mount MSOP 8 3.2 x 3.2 x 0.95mm 0.95mm 3.2mm 5.5 V
RS Stock No. 183-1751
Mfr. Part No.AD8210YRZ-REEL7
kr 27,477
Each (On a Reel of 1000)
Units
Single 5 V - 100dB 1 Single Ended - Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 5.5 V
RS Stock No. 917-3435
Mfr. Part No.LTC6102CMS8#PBF
kr 24,036
Each (In a Tube of 50)
Units
Single 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V - - 1 - 0.45 mA Surface Mount MSOP 8 3 x 3 x 0.86mm 0.86mm 3mm 60 V
RS Stock No. 412-456
Mfr. Part No.AD8210YRZ
kr 40,28
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. 820-9390
Mfr. Part No.AD8418BRMZ
kr 10,502
Each (In a Pack of 5)
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. 145-7168
Mfr. Part No.AD8212YRMZ
kr 23,645
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. 761-9623
Mfr. Part No.LTC6101BIS5#TRMPBF
kr 35,89
Each
Units
Single 4 60 V 4 60V - 1 Unidirectional 0.64 mA Surface Mount TSOT-23 5 2.9 x 1.75 x 0.9mm 0.9mm 2.9mm 60 V
RS Stock No. 121-6660
Mfr. Part No.AD8273ARZ
kr 28,374
Each (In a Tube of 56)
Units
- - - - - - - - - - - - - -
RS Stock No. 912-6215
Mfr. Part No.AD8210WYRZ
kr 34,265
Each (In a Tube of 98)
Units
Single 5 V - - 1 - - Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 5.5 V