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. 829-1544
Mfr. Part No.TSC1021BIYPT
HK$7.256
Each (In a Pack of 5)
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
New
RS Stock No. 190-4303
Mfr. Part No.MAX4080TASA+T
BrandMaxim
HK$12.558
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. 165-9308
Mfr. Part No.MAX4372FESA+
BrandMaxim
HK$20.25
Each (In a Tube of 100)
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
RS Stock No. 165-5719
Mfr. Part No.TSC1021AIYPT
HK$6.618
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. 901-3976
Mfr. Part No.Si8920BC-IP
HK$24.97
Each (In a Pack of 2)
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
New
RS Stock No. 192-2903
Mfr. Part No.MAX4377TASA+
BrandMaxim
HK$24.358
Each (In a Pack of 5)
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. 738-5131
Mfr. Part No.ZXCT1022E5TA
HK$10.606
Each (In a Pack of 5)
units
- - - - - - - - - - - - - -
RS Stock No. 820-9750
Mfr. Part No.AD8418AWBRMZ
HK$22.472
Each (In a Pack of 5)
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. 170-8232
Mfr. Part No.ISL28006FH50Z-T7A
HK$14.384
Each (On a Reel of 250)
units
Single 2.7 → 28 V - 105dB 1 - 50 μA Surface Mount SOT-23 5 2.9 x 1.6 x 1.14mm 1.14mm 2.9mm 28 V
RS Stock No. 732-7891
Mfr. Part No.MAX4080TASA+
BrandMaxim
HK$15.41
Each
units
Single 4.5 → 76 V - 100dB 1 Rail to Rail 0.19 mA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 76 V
RS Stock No. 817-6584
Mfr. Part No.INA220AIDGST
HK$19.428
Each (In a Pack of 5)
units
Single 3 → 5.5 V - 100dB 1 Bidirectional 1 mA Surface Mount VSSOP 10 3.1 x 3.1 x 0.95mm 0.95mm 3.1mm 5.5 V
New
RS Stock No. 190-6383
Mfr. Part No.MAX44284FAUT+T
BrandMaxim
HK$23.006
Each (In a Pack of 5)
units
Single 1.7 → 5.5 V - 91.3dB 1 Voltage 41.5 μA Surface Mount SOT-23 6 3 x 1.75 x 1.3mm 1.3mm 3mm 5.5 V
RS Stock No. 919-9556
Mfr. Part No.LTC6101HVAHMS8#PBF
HK$29.894
Each (In a Tube of 50)
units
Single 100 V - - 1 Unidirectional 0.72 mA Surface Mount MSOP 8 3 x 3 x 0.86mm 0.86mm 3mm 100 V
RS Stock No. 165-4505
Mfr. Part No.MAX9929FAUA+
BrandMaxim
HK$18.544
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. 165-9357
Mfr. Part No.MAX4173FEUT+T
BrandMaxim
HK$21.099
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$41.04
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. 163-0187
Mfr. Part No.NCS210SQT2G
HK$5.78
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. 169-0203
Mfr. Part No.SI8920BD-IS
HK$25.122
Each (In a Tube of 46)
units
Single 3 → 5.5 V - - 2 Differential 5.5 mA Surface Mount SOIC 16 10.3 x 7.5 x 2.35mm 2.35mm 10.3mm 5.5 V
RS Stock No. 786-1114
Mfr. Part No.MAX4373FESA+
BrandMaxim
HK$20.12
Each (In a Pack of 2)
units
Single 2.7 → 28 V - 85dB 1 Differential 100 μA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 28 V
RS Stock No. 160-9876
Mfr. Part No.AD8418ABRMZ-RL
HK$14.003
Each (On a Reel of 3000)
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
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