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. 168-7749
Mfr. Part No.TSC102IPT
HK$6.347
Each (On a Reel of 4000)
units
Single 2.8 → 30 V - 90dB 1 - 700 μA Surface Mount TSSOP 8 4.5 x 3.1 x 1.05mm 1.05mm 4.5mm 5.5 V
RS Stock No. 461-6564
Mfr. Part No.INA168NA/250
HK$18.21
Each
units
Single 3 V, 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V - 100dB 1 - - Surface Mount SOT-23 5 2.9 x 1.6 x 1.15mm 1.15mm 2.9mm 36 V
New
RS Stock No. 189-8723
Mfr. Part No.MAX4173FESA+
BrandMaxim
HK$13.024
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. 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. 145-7041
Mfr. Part No.LTC6102HMS8#PBF
HK$28.378
Each (In a Tube of 50)
units
Single 12 V - - 1 - 675 μA Surface Mount MSOP 8 3 x 3 x 0.86mm 0.86mm 3mm 60 V
New
RS Stock No. 190-4325
Mfr. Part No.MAX4372HEUK+T
BrandMaxim
HK$11.08
Each (On a Reel of 2500)
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. 165-9205
Mfr. Part No.MAX4070AUA+
BrandMaxim
HK$24.107
Each (In a Tube of 50)
units
Single 2.7 → 24 V - 100dB 1 Rail to Rail 0.25 mA Surface Mount μMAX 8 3.05 x 3.05 x 0.95mm 0.95mm 3.05mm 24 V
RS Stock No. 168-7760
Mfr. Part No.TSC103IPT
HK$17.221
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
New
RS Stock No. 190-4302
Mfr. Part No.MAX4080SAUA+T
BrandMaxim
HK$12.804
Each (On a Reel of 2500)
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. 162-6303
Mfr. Part No.LMP8603MA/NOPB
HK$18.923
Each (In a Tube of 95)
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. 835-3790
Mfr. Part No.AD8417WBRZ
HK$24.64
Each (In a Pack of 2)
units
Single 5 V - 90dB 1 Buffered 4.1 mA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 5.5 V
RS Stock No. 186-1269
Mfr. Part No.NCS211RMUTAG
HK$2.689
Each (On a Reel of 3000)
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. 923-6968
Mfr. Part No.MAX4372TEUK+T
BrandMaxim
HK$13.438
Each (On a Reel of 2500)
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. 186-1444
Mfr. Part No.NCS211RMUTAG
HK$7.483
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. 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
RS Stock No. 162-5367
Mfr. Part No.INA202AIDGKT
HK$14.754
Each (On a Reel of 250)
units
- - - - - - - Surface Mount MSOP 8 3 x 3 x 0.97mm 0.97mm 3mm -
New
RS Stock No. 190-6559
Mfr. Part No.MAX4081SAUA+
BrandMaxim
HK$19.892
Each (In a Pack of 5)
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. 545-7669
Mfr. Part No.INA198AIDBVT
HK$18.254
Each (In a Pack of 5)
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. 912-9914
Mfr. Part No.AD8218BRMZ
HK$15.837
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. 921-5138
Mfr. Part No.INA214AIDCKT
HK$8.195
Each (On a Reel of 250)
units
Single 3 V, 5 V, 9 V, 12 V, 15 V, 18 V, 24 V - 105dB 1 - - Surface Mount SC-70 6 2 x 1.25 x 0.9mm 0.9mm 2mm 26 V
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