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. 860-7517
Mfr. Part No.CS30CL
HK$10.758
Each (In a Pack of 5)
units
Single 2.8 → 30 V - - 2 Single Ended - Surface Mount SOT-23 5 3 x 1.75 x 1.3mm 1.3mm 3mm -
RS Stock No. 162-4671
Mfr. Part No.INA198AIDBVT
HK$16.451
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. 165-9191
Mfr. Part No.MAX4080TAUA+
BrandMaxim
HK$24.505
Each (In a Tube of 50)
units
Single 4.5 → 76 V - 100dB 1 Rail to Rail 0.19 mA Surface Mount μMAX 8 3.1 x 3.1 x 0.95mm 0.95mm 3.1mm 76 V
RS Stock No. 145-7236
Mfr. Part No.AD8417WBRMZ
HK$16.123
Each (In a Tube of 50)
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
New
RS Stock No. 185-8909
Mfr. Part No.NCV210RSQT2G
HK$8.476
Each (In a Pack of 9)
units
Single 2.2 → 26 V - 105dB 1 Rail to Rail 60 μA Surface Mount SC-70 6 2.2 x 1.35 x 1mm 1mm 2.2mm 26 V
RS Stock No. 798-9903
Mfr. Part No.AD8418AWBRZ
HK$22.47
Each
units
Single 2.7 → 5.5 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. 709-4522
Mfr. Part No.INA211AIDCKT
HK$17.28
Each
units
Single 3 V, 5 V, 9 V, 12 V, 15 V, 18 V, 24 V - 105dB 1 - - Surface Mount SC-70 6 2 x 1.25 x 0.9mm 0.9mm 2mm 26 V
RS Stock No. 761-6334
Mfr. Part No.LMP8603MA/NOPB
HK$24.19
Each
units
Single 5 V - 80dB 1 Bidirectional, Differential, Rail to Rail, Unidirectional 1.3 mA Surface Mount SOIC 8 3 x 3 x 0.86mm 0.86mm 3mm 5.5 V
RS Stock No. 817-6534
Mfr. Part No.INA199A2DCKT
HK$6.968
Each (In a Pack of 5)
units
Single 2.7 → 26 V - 100dB 1 Bidirectional 100 μA Surface Mount SC-70 6 2.15 x 1.4 x 1mm 1mm 2.15mm 26 V
RS Stock No. 145-6450
Mfr. Part No.INA270AID
HK$17.587
Each (In a Tube of 75)
units
Single 2.7 → 18 V - 80dB 1 Unidirectional 900 μA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 18 V
RS Stock No. 661-3365
Mfr. Part No.INA202AIDGKT
HK$19.17
Each (In a Pack of 5)
units
- - - - - - - Surface Mount MSOP 8 3 x 3 x 0.97mm 0.97mm 3mm -
New
RS Stock No. 189-0464
Mfr. Part No.NCV211RSQT2G
HK$6.991
Each (In a Pack of 25)
units
Single 5 V - 105dB 1 Rail to Rail 80 μA Surface Mount SC-70 6 2.2 x 1.35 x 1mm 1mm 2.2mm 26 V
RS Stock No. 732-8421
Mfr. Part No.MAX4372FESA+
BrandMaxim
HK$20.03
Each
units
Single 2.7 → 28 V - - 1 Differential 0.06 mA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 28 V
New
RS Stock No. 185-8097
Mfr. Part No.NCV210RSQT2G
HK$3.047
Each (On a Reel of 3000)
units
Single 2.2 → 26 V - 105dB 1 Rail to Rail 60 μA Surface Mount SC-70 6 2.2 x 1.35 x 1mm 1mm 2.2mm 26 V
RS Stock No. 796-8912
Mfr. Part No.AD8211YRJZ-R2
HK$20.566
Each (In a Pack of 5)
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. 162-8164
Mfr. Part No.INA199A3DCKT
HK$4.805
Each (On a Reel of 250)
units
Single 2.7 → 26 V - 100dB 1 Bidirectional 100 μA Surface Mount SC-70 6 2.15 x 1.4 x 1mm 1mm 2.15mm 26 V
RS Stock No. 426-308
Mfr. Part No.TSC101BILT
HK$11.648
Each (In a Pack of 5)
units
Single 5 V, 9 V, 12 V, 15 V, 18 V - 90dB 1 - 0.3 mA Surface Mount SOT-23 5 3 x 1.75 x 1.3mm 1.3mm 3mm 24 V
RS Stock No. 764-8744
Mfr. Part No.AD8218BRMZ
HK$22.85
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. 798-7743
Mfr. Part No.MAX4377TASA+
BrandMaxim
HK$24.275
Each (In a Pack of 2)
units
Single 3 → 28 V - 90dB 1 - 2.2 mA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 28 V
RS Stock No. 732-8437
Mfr. Part No.MAX4372TEUK+T
BrandMaxim
HK$19.798
Each (In a Pack of 5)
units
Single 2.7 → 28 V - - 1 Differential 0.06 mA Surface Mount SOT-23 5 3 x 1.75 x 1.3mm 1.3mm 3mm 28 V
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