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. 919-9881
Mfr. Part No.LT6106HS5#TRMPBF
HK$12.664
Each (On a Reel of 500)
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. 786-9727
Mfr. Part No.LT6106HS5#TRMPBF
HK$14.616
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. 145-1310
Mfr. Part No.LT1999IMS8-20#PBF
HK$29.441
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. 779-9568
Mfr. Part No.LT2940IMS#PBF
HK$50.89
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. 822-5844
Mfr. Part No.LT1999IMS8-20#PBF
HK$41.41
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. 155-5368
Mfr. Part No.LT2940IMS#PBF
HK$33.771
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. 145-6632
Mfr. Part No.AD8418WBRMZ
HK$14.568
Each (In a Tube of 50)
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. 145-6633
Mfr. Part No.AD8213WYRMZ
HK$33.521
Each (In a Tube of 50)
units
Single 5 V - 100dB 2 Buffered 4.5 mA Surface Mount MSOP 10 3.1 x 3.1 x 0.95mm 0.95mm 3.1mm 5.5 V
RS Stock No. 183-1913
Mfr. Part No.AD8417WHRMZ
HK$31.382
Each (In a Pack of 5)
units
Single 2.7 → 5.5 V - 90dB 1 Buffered - Surface Mount MSOP 8 3.2 x 3.2 x 0.95mm 0.95mm 3.2mm 5.5 V
RS Stock No. 160-9875
Mfr. Part No.AD8417WBRZ
HK$16.124
Each (In a Tube of 98)
units
Single 5 V - 90dB 1 Buffered 4.1 mA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 5.5 V
RS Stock No. 820-9750
Mfr. Part No.AD8418AWBRMZ
HK$22.472
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. 159-7872
Mfr. Part No.AD8215YRZ
HK$17.115
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. 761-8894
Mfr. Part No.LT6105IMS8#PBF
HK$23.44
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. 709-5636
Mfr. Part No.AD22057RZ
HK$97.71
Each
units
Single 5 V - 80dB 1 - - Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 36 V
RS Stock No. 761-8897
Mfr. Part No.LT6106CS5#TRMPBF
HK$18.58
Each
units
Single 36 V - - 1 - 0.13 mA Surface Mount TSOT-23 5 2.9 x 1.75 x 0.9mm 0.9mm 2.9mm 36 V
RS Stock No. 697-7224
Mfr. Part No.AD8210WYRZ
HK$41.90
Each
units
Single 5 V - - 1 - - Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 5.5 V
RS Stock No. 160-9876
Mfr. Part No.AD8418ABRMZ-RL
HK$14.003
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. 183-1929
Mfr. Part No.AD8418ABRMZ
HK$24.864
Each (In a Pack of 5)
units
Single 2.7 → 5.5 V - 90dB 1 Buffered - 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
HK$25.588
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. 820-9390
Mfr. Part No.AD8418BRMZ
HK$19.296
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