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. 817-6607
Mfr. Part No.INA283AID
HK$26.056
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
New
RS Stock No. 190-6610
Mfr. Part No.MAX9611AUB+T
BrandMaxim
HK$37.054
Each (In a Pack of 5)
units
Single 2.7 → 5.5 V - 84dB 1 Rail to Rail 2.6 mA Surface Mount μMAX 10 3.16 x 3.12 x 0.95mm 0.95mm 3.16mm 5.5 V
RS Stock No. 811-5793
Mfr. Part No.LMP8602QMA/NOPB
HK$32.556
Each (In a Pack of 5)
units
Single 5 V - 90dB 1 Bidirectional 1.3 mA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 60 V
RS Stock No. 145-6633
Mfr. Part No.AD8213WYRMZ
HK$33.521
Each (In a Tube of 50)
units
Single 5 V - 100dB 2 Buffered 4.5 mA Surface Mount MSOP 10 3.1 x 3.1 x 0.95mm 0.95mm 3.1mm 5.5 V
New
RS Stock No. 178-4566
Mfr. Part No.NCS210RMUTAG
HK$4.319
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. 145-6450
Mfr. Part No.INA270AID
HK$17.587
Each (In a Tube of 75)
units
Single 2.7 → 18 V - 80dB 1 Unidirectional 900 μA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 18 V
RS Stock No. 709-4522
Mfr. Part No.INA211AIDCKT
HK$12.11
Each
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
RS Stock No. 185-8099
Mfr. Part No.NCV214RSQT2G
HK$3.047
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
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 - - - - - - - - - -
RS Stock No. 154-7664
Mfr. Part No.LTC6101BCS5#TRMPBF
HK$18.728
Each (On a Reel of 500)
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
New
RS Stock No. 190-4388
Mfr. Part No.MAX9934TAUA+
BrandMaxim
HK$15.02
Each (In a Tube of 50)
units
Single 2.5 → 3.6 V - 98dB 1 Current 230 μA Surface Mount μMAX 8 3.1 x 3.1 x 0.95mm 0.95mm 3.1mm 3.6 V
New
RS Stock No. 190-4390
Mfr. Part No.MAX9938TEUK+T
BrandMaxim
HK$6.845
Each (On a Reel of 2500)
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. 761-9626
Mfr. Part No.LTC6101HVACS5#TRMPBF
HK$47.75
Each
units
Single 5 → 100 V 5 → 100V - 1 Unidirectional 0.64 mA Surface Mount TSOT-23 5 2.9 x 1.75 x 0.9mm 0.9mm 2.9mm 100 V
RS Stock No. 145-7077
Mfr. Part No.INA201AIDGKT
HK$14.754
Each (On a Reel of 250)
units
- - - - - - - Surface Mount MSOP 8 3 x 3 x 0.97mm 0.97mm 3mm -
RS Stock No. 779-9482
Mfr. Part No.LT1787CS8#PBF
HK$32.49
Each (In a Pack of 2)
units
Single 36 V - - 1 Bidirectional, Unidirectional 60 μA Surface Mount SOIC 8 5.004 x 3.988 x 1.498mm 1.498mm 5mm 36 V
RS Stock No. 860-7505
Mfr. Part No.CS30AL
HK$9.072
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 -
RS Stock No. 545-7625
Mfr. Part No.INA194AIDBVT
HK$20.214
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. 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. 165-9412
Mfr. Part No.MAX9928FAUA+
BrandMaxim
HK$20.414
Each (In a Tube of 50)
units
Single 2.5 → 5.5 V - 93dB 1 Bidirectional, Unidirectional 200 μA Surface Mount μMAX 8 3.05 x 3.05 x 0.95mm 0.95mm 3.05mm 5.5 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
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