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
New
RS Stock No. 189-7320
Mfr. Part No.MAX4373TESA+
BrandMaxim
HK$18.359
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
RS Stock No. 162-7736
Mfr. Part No.LMP8640HVMKE-F/NOPB
HK$13.29
Each (On a Reel of 250)
units
Dual - ±12 V, ±2.7 V, ±5 V 103dB 1 Buffered 800 μA Surface Mount SOT-23 6 3.05 x 1.75 x 1mm 1mm 3.05mm 12 V
New
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. 786-1095
Mfr. Part No.MAX4173FESA+
BrandMaxim
HK$12.25
Each (In a Pack of 5)
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. 825-3088
Mfr. Part No.INA219AIDCNR
HK$14.922
Each (In a Pack of 5)
units
Single 6 V - 100dB 1 Digital 5 mA Surface Mount SOT-23 8 3 x 1.75 x 1.3mm 1.3mm 3mm 5.5 V
RS Stock No. 820-9397
Mfr. Part No.AD8418WBRMZ
HK$18.176
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. 185-8087
Mfr. Part No.NCS214RSQT2G
HK$2.54
Each (On a Reel of 3000)
units
Single 2.2 → 26 V - 105dB 1 Rail to Rail 60 μA Surface Mount SC-70 6 2.2 x 1.35 x 1mm 1mm 2.2mm 26 V
New
RS Stock No. 192-2361
Mfr. Part No.MAX9920ASA+
BrandMaxim
HK$16.028
Each (In a Pack of 5)
units
Single 4.5 → 5.5 V - 72dB 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
New
RS Stock No. 189-9122
Mfr. Part No.MAX9611AUB+
BrandMaxim
HK$21.146
Each (In a Pack of 5)
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
New
RS Stock No. 189-0234
Mfr. Part No.NCS211RSQT2G
HK$2.661
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. 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
New
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. 920-9855
Mfr. Part No.NCS210SQT2G
HK$10.70
Each (In a Pack of 10)
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
New
RS Stock No. 189-7307
Mfr. Part No.MAX4173TESA+
BrandMaxim
HK$11.131
Each (In a Tube of 100)
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. 189-7285
Mfr. Part No.MAX4080FASA+
BrandMaxim
HK$14.123
Each (In a Tube of 100)
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. 165-9686
Mfr. Part No.MAX9919NASA+
BrandMaxim
HK$19.883
Each (In a Tube of 100)
units
Single 4.5 → 5.5 V - 80dB 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. 761-9614
Mfr. Part No.LTC6101BCS5#TRMPBF
HK$36.33
Each
units
Single 4 → 60 V 4 → 60V - 1 Unidirectional 0.64 mA Surface Mount TSOT-23 5 2.9 x 1.75 x 0.9mm 0.9mm 2.9mm 60 V
RS Stock No. 817-6616
Mfr. Part No.INA286AID
HK$28.338
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. 121-9343
Mfr. Part No.LMP8640MKE-F/NOPB
HK$12.292
Each (On a Reel of 250)
units
Dual - ±12 V, ±2.7 V, ±5 V 103dB 1 Buffered 800 μA Surface Mount SOT-23 6 3.05 x 1.75 x 1mm 1mm 3.05mm 12 V
RS Stock No. 738-5250
Mfr. Part No.ZXCT1082E5TA
HK$12.498
Each (In a Pack of 5)
units
Single 2.7 → 60 V - 80dB - - - - - - - - - -