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. 820-9797
Mfr. Part No.AD8418WBRZ
HK$21.814
Each (In a Pack of 7)
units
Single 5 V - 90dB 1 Bidirectional 130 μA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 5.5 V
New
RS Stock No. 189-7364
Mfr. Part No.MAX9918ASA+
HK$13.248
Each (In a Tube of 100)
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. 795-9176
Mfr. Part No.TSC102IPT
HK$14.38
Each (In a Pack of 2)
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. 835-3781
Mfr. Part No.AD8417WBRMZ
HK$24.145
Each (In a Pack of 2)
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
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
New
RS Stock No. 189-8723
Mfr. Part No.MAX4173FESA+
HK$14.426
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
New
RS Stock No. 190-4326
Mfr. Part No.MAX4372TESA+
HK$13.912
Each (In a Tube of 100)
units
Single 2.7 28 V - 85 (Typ.)dB 1 Voltage 60 μA Surface Mount SO 8 5 x 4 x 1.5mm 1.5mm 5mm 28 V
RS Stock No. 160-9848
Mfr. Part No.AD8418AWBRMZ
HK$18.453
Each (In a Tube of 50)
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. 820-9397
Mfr. Part No.AD8418WBRMZ
HK$21.806
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. 183-1913
Mfr. Part No.AD8417WHRMZ
HK$31.382
Each (In a Pack of 5)
units
Single 2.7 → 5.5 V - 90dB 1 Buffered - Surface Mount MSOP 8 3.2 x 3.2 x 0.95mm 0.95mm 3.2mm 5.5 V
New
RS Stock No. 190-6410
Mfr. Part No.MAX4080TASA+T
HK$26.602
Each (In a Pack of 5)
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
New
RS Stock No. 190-6302
Mfr. Part No.MAX4372HEUK+T
HK$26.24
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. 185-8847
Mfr. Part No.NCS199A3RSQT2G
HK$7.483
Each (In a Pack of 10)
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. 860-7514
Mfr. Part No.CS30BL
HK$9.976
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 -
New
RS Stock No. 190-4315
Mfr. Part No.MAX4173HESA+
HK$11.942
Each (In a Tube of 100)
units
Single 3 28 V - 90 (Typ.)dB 1 Voltage 1 mA Surface Mount SO 8 5 x 4 x 1.5mm 1.5mm 5mm 28 V
RS Stock No. 912-6215
Mfr. Part No.AD8210WYRZ
HK$32.94
Each (In a Tube of 98)
units
Single 5 V - - 1 - - Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 5.5 V
RS Stock No. 817-6546
Mfr. Part No.INA199A3DCKT
HK$7.01
Each (In a Pack of 5)
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
New
RS Stock No. 197-7169
Mfr. Part No.INA168NA/250
HK$19.70
Each (In a Pack of 5)
units
Single 5 V - 100dB 1 Current - - SOT-23 5 - - - -
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. 165-9497
Mfr. Part No.MAX4373TESA+
HK$29.292
Each (In a Tube of 100)
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
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