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. 185-9030
Mfr. Part No.NCV214RSQT2G
HK$7.581
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. 178-4384
Mfr. Part No.NCS199A1RSQT2G
HK$1.978
Each (On a Reel of 3000)
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. 162-8172
Mfr. Part No.INA3221AIRGVT
HK$24.915
Each (On a Reel of 250)
units
Single 2.7 → 5.5 V - 110dB 1 Open Drain 450 μA Surface Mount VQFN 16 4.15 x 4.15 x 0.95mm 0.95mm 4.15mm 5.5 V
RS Stock No. 170-8125
Mfr. Part No.ISL28023FR12Z-T7A
BrandIntersil
HK$37.65
Each (On a Reel of 250)
units
Single 3.3 V - 136dB 2 Open Drain 1.24 mA Surface Mount QFN 24 4 x 4 x 0.85mm 0.85mm 4mm 5.5 V
RS Stock No. 798-5012
Mfr. Part No.MAX4377TASA+
HK$15.039
Each (In a Tube of 100)
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. 178-4387
Mfr. Part No.NCS214RMUTAG
HK$2.592
Each (On a Reel of 3000)
units
Single 5 V - 105dB 1 Rail to Rail 80 μA Surface Mount UQFN 10 1.4 x 1.8 x 0.55mm 0.55mm 1.4mm 26 V
RS Stock No. 165-5474
Mfr. Part No.IR2175PBF
BrandInfineon
HK$26.172
Each (In a Tube of 50)
units
Single 5 V - - 1 Open Drain 0.5 mA Through Hole PDIP 8 5 x 4 x 1.75mm 1.75mm 5mm 5 V
RS Stock No. 155-9341
Mfr. Part No.LT6108IMS8-2#PBF
HK$18.272
Each (In a Tube of 50)
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. 423-478
Mfr. Part No.LTC6104CMS8#PBF
HK$31.77
Each
units
Single 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V - - 1 - 1.04 mA Surface Mount MSOP 8 3 x 3 x 0.86mm 0.86mm 3mm 60 V
RS Stock No. 189-7306
Mfr. Part No.MAX4173FEUT+T
HK$13.414
Each (On a Reel of 2500)
units
Single 3 → 28 V - 90dB 1 - 1 mA Surface Mount SOT-23 6 3 x 1.75 x 1.3mm 1.3mm 3mm 28 V
RS Stock No. 183-1949
Mfr. Part No.AD8210YRZ-REEL7
HK$42.22
Each (In a Pack of 2)
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. 189-7749
Mfr. Part No.MAX4080TAUA+
HK$14.462
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
New
RS Stock No. 202-4811
Mfr. Part No.TSC2011IDT
HK$18.464
Each (In a Pack of 5)
units
Single 5.5 V - 85dB 1 Bidirectional - - SO8 8 - - - -
RS Stock No. 822-6657
Mfr. Part No.LTC4151IDD#PBF
HK$64.27
Each
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. 189-7368
Mfr. Part No.MAX9929FAUA+
HK$14.12
Each (In a Tube of 50)
units
Single - - 87dB 2 Bidirectional, Unidirectional 20 μA Surface Mount μMAX 8 3.1 x 3.1 x 0.95mm 0.95mm 3.1mm 5.5 V
RS Stock No. 145-7027
Mfr. Part No.LMP8640MKE-T/NOPB
HK$12.36
Each (On a Reel of 250)
units
Single 2.7 → 12 V - 103dB 1 Single Ended 2750 μA Surface Mount SOT-23 6 3.05 x 1.75 x 1mm 1mm 3.05mm 12 V
RS Stock No. 191-5163
Mfr. Part No.MAX9919FASA+
HK$17.158
Each (In a Pack of 5)
units
Single 4.5 → 5.5 V - 96dB 1 Rail to Rail 2.2 mA Surface Mount SOIC 8 4.98 x 3.99 x 1.58mm 1.58mm 4.98mm 5.5 V
RS Stock No. 190-4299
Mfr. Part No.MAX4073TAUT+T
HK$8.57
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. 177-7171
Mfr. Part No.LTC6102IMS8#PBF
HK$24.624
Each (In a Tube of 50)
units
Single 5 → 100 V - - 1 Rail to Rail 650 μA Surface Mount MSOP 8 3 x 3 x 0.9984mm 0.998mm 3mm 100 V
RS Stock No. 169-0202
Mfr. Part No.SI8920AC-IP
HK$27.474
Each (In a Tube of 50)
units
Single 3 → 5.5 V - - 2 Differential 5.5 mA Through Hole DIP 8 9.9 x 6.6 x 3.44mm 3.44mm 9.9mm 5.5 V
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