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. 177-7171
Mfr. Part No.LTC6102IMS8#PBF
HK$27.133
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. 190-6445
Mfr. Part No.MAX9938TEUK+T
HK$10.23
Each (In a Pack of 5)
units
Single 1.6 → 28 V - 94dB 1 Voltage 2.5 μA Surface Mount SOT-23 5 3 x 1.75 x 1.3mm 1.3mm 3mm 28 V
RS Stock No. 190-6673
Mfr. Part No.MAX9922EUB+
HK$23.634
Each (In a Pack of 5)
units
Single 2.85 → 5.5 V - 121dB 1 Rail to Rail 1500 μA Surface Mount μMAX 10 3.16 x 3.12 x 0.95mm 0.95mm 3.16mm 5.5 V
RS Stock No. 912-7163
Mfr. Part No.AD8210YRZ
HK$29.95
Each (In a Tube of 98)
units
Single 5 V - 120 1 Bidirectional - Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 5.5 V
RS Stock No. 189-8918
Mfr. Part No.MAX9918ASA+
HK$17.494
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. 426-190
Mfr. Part No.TSC101AILT
HK$11.278
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. 162-8164
Mfr. Part No.INA199A3DCKT
HK$4.567
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. 165-5474
Mfr. Part No.IR2175PBF
BrandInfineon
HK$25.41
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. 121-7248
Mfr. Part No.ISL28022FRZ-T7A
BrandIntersil
HK$29.86
Each (In a Pack of 2)
units
Single 3.3 V - 110dB 2 Open Drain 0.7 mA Surface Mount QFN 16 3 x 3 x 0.85mm 0.85mm 3mm 5.5 V
RS Stock No. 921-5305
Mfr. Part No.INA226AIDGST
HK$19.645
Each (On a Reel of 250)
units
- - - - - - - Surface Mount MSOP 10 3.1 x 3.1 x 0.95mm 0.95mm 3.1mm -
RS Stock No. 851-6828
Mfr. Part No.LT6108IMS8-2#PBF
HK$30.82
Each (In a Pack of 5)
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. 145-7077
Mfr. Part No.INA201AIDGKT
HK$15.66
Each (On a Reel of 250)
units
- - - - - - - Surface Mount MSOP 8 3 x 3 x 0.97mm 0.97mm 3mm -
RS Stock No. 817-6607
Mfr. Part No.INA283AID
HK$30.848
Each (In a Pack of 5)
units
Single 2.7 → 18 V - 120dB 1 Bidirectional 900 μA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 18 V
RS Stock No. 191-4880
Mfr. Part No.MAX4378FAUD+
HK$26.722
Each (In a Pack of 5)
units
Single 3 → 28 V - 90dB - Voltage 2.2 mA Surface Mount TSSOP 14 5.1 x 4.5 x 0.95mm 0.95mm 5.1mm 28 V
RS Stock No. 178-4424
Mfr. Part No.NCS214RMUTAG
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. 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. 189-8885
Mfr. Part No.MAX4372TEUK+T
HK$16.922
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
RS Stock No. 168-7760
Mfr. Part No.TSC103IPT
HK$8.704
Each (On a Reel of 4000)
units
Dual, Single 2.9 → 70 V -2.1 → 65V 90dB 1 Buffered 480 μA Surface Mount TSSOP 8 4.5 x 3.1 x 1.05mm 1.05mm 4.5mm 5.5 V
RS Stock No. 122-3297
Mfr. Part No.ZXCT1020E5TA
HK$4.88
Each (On a Reel of 3000)
units
Single 2.5 → 20 V - - 1 Low Offset Current 35 μA Surface Mount SOT-23 5 3.1 x 1.8 x 1.3mm 1.3mm 3.1mm 20 V
RS Stock No. 921-3006
Mfr. Part No.INA200AIDGKR
HK$10.661
Each (On a Reel of 2500)
units
Single 12 V - 80dB 1 Analogue 5 mA Surface Mount VSSOP 8 3.1 x 3.1 x 0.95mm 0.95mm 3.1mm 18 V
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