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. 183-1762
Mfr. Part No.AD8418ABRMZ
kr 19,378
Each (In a Tube of 50)
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. 197-7163
Mfr. Part No.INA138NA/250
kr 20,24
Each (In a Pack of 5)
Units
Single 5 V - 100dB 1 Current - - SOT-23 5 - - - -
RS Stock No. 796-8912
Mfr. Part No.AD8211YRJZ-R2
kr 23,05
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. 190-4299
Mfr. Part No.MAX4073TAUT+T
kr 9,645
Each (On a Reel of 2500)
Units
Single 3 → 28 V - 90 (Typ.)dB 1 Voltage 1.2 mA Surface Mount SOT-23 6 3 x 1.75 x 1.3mm 1.3mm 3mm 28 V
RS Stock No. 786-1108
Mfr. Part No.MAX4173TESA+
kr 14,896
Each (In a Pack of 5)
Units
Single 3 → 28 V - 90dB 1 Differential 1 mA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 28 V
RS Stock No. 121-8924
Mfr. Part No.INA197AIDBVT
kr 14,788
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. 190-4306
Mfr. Part No.MAX4081SAUA+
kr 21,896
Each (In a Tube of 50)
Units
Single 4.5 → 76 V - 100dB 1 Voltage 190 μA Surface Mount μMAX 8 3.1 x 3.1 x 0.95mm 0.95mm 3.1mm 76 V
RS Stock No. 165-5536
Mfr. Part No.IR25750LTRPBF
BrandInfineon
kr 2,704
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. 190-6302
Mfr. Part No.MAX4372HEUK+T
kr 18,046
Each (In a Pack of 5)
Units
Single 2.7 → 28 V - 85 (Typ.)dB 1 Voltage 60 μA Surface Mount SOT-23 5 3 x 1.75 x 1.3mm 1.3mm 3mm 28 V
RS Stock No. 761-6337
Mfr. Part No.LMP8602MA/NOPB
kr 32,10
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. 163-0187
Mfr. Part No.NCS210SQT2G
kr 4,979
Each (On a Reel of 3000)
Units
Single 2.7 → 26 V - 103dB 1 Rail to Rail 5 mA Surface Mount SC-70 6 2.2 x 1.35 x 1mm 1mm 2.2mm 26 V
RS Stock No. 145-6632
Mfr. Part No.AD8418WBRMZ
kr 18,273
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. 879-3375
Mfr. Part No.IR25750LTRPBF
BrandInfineon
kr 2,82
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. 178-4554
Mfr. Part No.NCS199A1RSQT2G
kr 5,476
Each (In a Pack of 50)
Units
Single 5 V - 100dB 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. 661-3407
Mfr. Part No.XTR111AIDGQT
kr 17,85
Each
Units
- - - - - - - Surface Mount HTSSOP 10 3 x 3 x 1.02mm 1.02mm 3mm -
RS Stock No. 190-4303
Mfr. Part No.MAX4080TASA+T
kr 12,837
Each (On a Reel of 2500)
Units
Single 4.5 → 76 V - 100dB 1 Voltage 190 μA Surface Mount SO 8 5 x 4 x 1.5mm 1.5mm 5mm 76 V
RS Stock No. 189-0234
Mfr. Part No.NCS211RSQT2G
kr 2,467
Each (On a Reel of 3000)
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. 920-9855
Mfr. Part No.NCS210SQT2G
kr 5,115
Each (In a Pack of 10)
Units
Single 2.7 → 26 V - 103dB 1 Rail to Rail 5 mA Surface Mount SC-70 6 2.2 x 1.35 x 1mm 1mm 2.2mm 26 V
RS Stock No. 155-7545
Mfr. Part No.LTC4151IDD#PBF
kr 43,81
Each (In a Tube of 141)
Units
Single 4.5 → 5.5 V - - 1 Open Collector 1.7 mA Surface Mount DFN 10 3 x 3 x 0.7mm 0.7mm 3mm 80 V
RS Stock No. 920-6317
Mfr. Part No.TSC101AILT
kr 4,481
Each (On a Reel of 3000)
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
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