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. 761-8894
Mfr. Part No.LT6105IMS8#PBF
R 40.57
Each
units
Single 36 V - 90dB 1 Differential 0.35 mA Surface Mount MSOP 8 3 x 3 x 0.86mm 0.86mm 3mm 36 V
RS stock no. 919-9354
Mfr. Part No.LT6105IMS8#PBF
R 28.094
Each (In a Tube of 50)
units
Single 36 V - 90dB 1 Differential 0.35 mA Surface Mount MSOP 8 3 x 3 x 0.86mm 0.86mm 3mm 36 V
RS stock no. 154-7664
Mfr. Part No.LTC6101BCS5#TRMPBF
R 35.102
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. 761-9614
Mfr. Part No.LTC6101BCS5#TRMPBF
R 67.78
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. 155-5368
Mfr. Part No.LT2940IMS#PBF
R 67.961
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. 779-9568
Mfr. Part No.LT2940IMS#PBF
R 112.88
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. 786-9718
Mfr. Part No.LT6100IMS8#PBF
R 58.905
Each (In a Pack of 2)
units
Single 2.7 → 36 V - 100dB 1 Differential 145 μA Surface Mount MSOP 8 3 x 3 x 0.86mm 0.86mm 3mm 36 V
RS stock no. 177-7160
Mfr. Part No.LT6100IMS8#PBF
R 53.021
Each (In a Tube of 50)
units
Single 2.7 → 36 V - 100dB 1 Differential 145 μA Surface Mount MSOP 8 3 x 3 x 0.86mm 0.86mm 3mm 36 V
RS stock no. 145-0965
Mfr. Part No.LT6105CMS8#PBF
R 27.105
Each (In a Tube of 50)
units
Single 2.85 → 36 V - 120dB 1 Unidirectional 350 μA Surface Mount MSOP 8 3 x 3 x 0.86mm 0.86mm 3mm 36 V
RS stock no. 851-6819
Mfr. Part No.LT6105CMS8#PBF
R 34.634
Each (In a Pack of 5)
units
Single 2.85 → 36 V - 120dB 1 Unidirectional 350 μA Surface Mount MSOP 8 3 x 3 x 0.86mm 0.86mm 3mm 36 V
RS stock no. 820-9797
Mfr. Part No.AD8418WBRZ
R 38.224
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. 919-9556
Mfr. Part No.LTC6101HVAHMS8#PBF
R 54.662
Each (In a Tube of 50)
units
Single 100 V - - 1 Unidirectional 0.72 mA Surface Mount MSOP 8 3 x 3 x 0.86mm 0.86mm 3mm 100 V
RS stock no. 786-9727
Mfr. Part No.LT6106HS5#TRMPBF
R 23.422
Each (In a Pack of 5)
units
Single 2.7 → 36 V - - 1 - 115 μA Surface Mount TSOT-23 5 2.9 x 1.75 x 0.9mm 0.9mm 2.9mm 36 V
RS stock no. 884-6807
Mfr. Part No.LTC6101AIMS8#PBF
R 58.556
Each (In a Pack of 5)
units
Single 12 V - - 1 - 640 μA Surface Mount MSOP 8 3 x 3 x 0.86mm 0.86mm 3mm 60 V
RS stock no. 145-7690
Mfr. Part No.LT1787IMS8#PBF
R 63.642
Each (In a Tube of 50)
units
Single 36 V - - 1 Bidirectional, Unidirectional 0.02 mA Surface Mount MSOP 8 3 x 3 x 0.86mm 0.86mm 3mm 36 V
RS stock no. 506-0417
Mfr. Part No.LT1787HVCS8#PBF
R 117.17
Each
units
Single 3 V, 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V - - 1 - 0.12 mA Surface Mount SOIC 8 5 x 3.99 x 1.48mm 1.48mm 5mm 60 V
RS stock no. 761-8453
Mfr. Part No.LT1787IMS8#PBF
R 105.68
Each
units
Single 36 V - - 1 Bidirectional, Unidirectional 0.02 mA Surface Mount MSOP 8 3 x 3 x 0.86mm 0.86mm 3mm 36 V
RS stock no. 159-9339
Mfr. Part No.AD8211YRJZ-R2
R 25.307
Each (On a Reel of 250)
units
Single 5 V - 100dB 1 Buffered 2 mA Surface Mount SOT-23 5 3 x 1.7 x 1.3mm 1.3mm 3mm 5.5 V
RS stock no. 121-6917
Mfr. Part No.AD8418WBRZ
R 27.889
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. 158-5274
Mfr. Part No.AD22057RZ
R 154.083
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 36 V