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. 146-1151
Mfr. Part No.MAX4172ESA+
HK$21.949
Each (In a Tube of 100)
units
Single 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V - - 1 - 1.6 mA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 32 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. 190-6314
Mfr. Part No.MAX4173TEUT+T
HK$21.682
Each (In a Pack of 5)
units
Single 3 → 28 V - 90 (Typ.)dB 1 Voltage 1 mA Surface Mount SOT-23 6 3 x 1.75 x 1.3mm 1.3mm 3mm 28 V
RS Stock No. 912-9914
Mfr. Part No.AD8218BRMZ
HK$17.37
Each (In a Tube of 50)
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. 186-1444
Mfr. Part No.NCS211RMUTAG
HK$5.984
Each (In a Pack of 10)
units
Single 2.2 → 26 V - 105dB 1 Rail to Rail 60 μA Surface Mount UQFN 10 1.4 x 1.8 x 0.55mm 0.55mm 1.4mm 26 V
RS Stock No. 121-8922
Mfr. Part No.INA195AIDBVT
HK$15.134
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. 178-4385
Mfr. Part No.NCS210RMUTAG
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. 189-8723
Mfr. Part No.MAX4173FESA+
HK$14.72
Each (In a Pack of 10)
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. 178-4566
Mfr. Part No.NCS210RMUTAG
HK$5.94
Each (In a Pack of 50)
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. 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. 189-0234
Mfr. Part No.NCS211RSQT2G
HK$2.666
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. 190-4330
Mfr. Part No.MAX4376FAUK+T
HK$10.859
Each (On a Reel of 2500)
units
Single 3 → 28 V - 90dB 1 Buffered 2.2 mA Surface Mount SOT-23 5 3 x 1.75 x 1.3mm 1.3mm 3mm 28 V
RS Stock No. 165-9409
Mfr. Part No.MAX9611AUB+
HK$20.188
Each (In a Tube of 50)
units
Single 2.7 → 5.5 V - 106dB 1 Rail to Rail 2.6 mA Surface Mount μMAX 10 3.05 x 3.05 x 0.95mm 0.95mm 3.05mm 6 V
RS Stock No. 185-8085
Mfr. Part No.NCS199A3RSQT2G
HK$2.689
Each (On a Reel of 3000)
units
Single 2.2 → 26 V - 100dB 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. 922-3265
Mfr. Part No.INA271AID
HK$14.725
Each (In a Tube of 75)
units
- - - - - - - - - - - - - -
RS Stock No. 190-6302
Mfr. Part No.MAX4372HEUK+T
HK$17.366
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. 165-5719
Mfr. Part No.TSC1021AIYPT
HK$5.356
Each (On a Reel of 4000)
units
Single - - 90dB 2 Analogue 450 μA Surface Mount TSSOP 8 4.5 x 3.1 x 1.05mm 1.05mm 4.5mm 5.5 V dc
RS Stock No. 121-7249
Mfr. Part No.ISL28023FR12Z-T7A
BrandIntersil
HK$53.82
Each (In a Pack of 2)
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. 860-7505
Mfr. Part No.CS30AL
HK$10.18
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. 922-8235
Mfr. Part No.ZXCT1084E5TA
HK$7.201
Each (On a Reel of 3000)
units
- - - - - - - - - - - - - -
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