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. 122-3297
Mfr. Part No.ZXCT1020E5TA
$0.984
Each (On a Reel of 3000)
units
Single 2.5 → 20 V - - 1 Low Offset Current 35 μA Surface Mount SOT-23 5 3.1 x 1.8 x 1.3mm 1.3mm 3.1mm 20 V
RS Stock No. 824-5475
Mfr. Part No.ZXCT1020E5TA
$1.346
Each (In a Pack of 10)
units
Single 2.5 → 20 V - - 1 Low Offset Current 35 μA Surface Mount SOT-23 5 3.1 x 1.8 x 1.3mm 1.3mm 3.1mm 20 V
RS Stock No. 165-9686
Mfr. Part No.MAX9919NASA+
$3.46
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. 783-3951
Mfr. Part No.MAX9919NASA+
$2.75
Each (In a Pack of 2)
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. 540-3791
Mfr. Part No.MAX4172ESA+
$4.50
Each
units
Single 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V - - 1 - 1.6 mA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 32 V
RS Stock No. 146-1151
Mfr. Part No.MAX4172ESA+
$4.913
Each (In a Tube of 100)
units
Single 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V - - 1 - 1.6 mA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 32 V
RS Stock No. 165-5536
Mfr. Part No.IR25750LTRPBF
BrandInfineon
$0.791
Each (On a Reel of 3000)
units
Single -5 → 600 V - - 1 Single Ended - Surface Mount SOT-23 5 3 x 1.75 x 1.3mm 1.3mm 3mm 600 V
RS Stock No. 879-3375
Mfr. Part No.IR25750LTRPBF
BrandInfineon
$0.774
Each (In a Pack of 10)
units
Single -5 → 600 V - - 1 Single Ended - Surface Mount SOT-23 5 3 x 1.75 x 1.3mm 1.3mm 3mm 600 V
RS Stock No. 162-8164
Mfr. Part No.INA199A3DCKT
$0.851
Each (On a Reel of 250)
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
RS Stock No. 817-6546
Mfr. Part No.INA199A3DCKT
$1.278
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
RS Stock No. 165-5474
Mfr. Part No.IR2175PBF
BrandInfineon
$4.895
Each (In a Tube of 50)
units
Single 5 V - - 1 Open Drain 0.5 mA Through Hole PDIP 8 5 x 4 x 1.75mm 1.75mm 5mm 5 V
RS Stock No. 829-1544
Mfr. Part No.TSC1021BIYPT
$1.916
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. 865-5699
Mfr. Part No.IR2175PBF
BrandInfineon
$5.765
Each (In a Tube of 2)
units
Single 5 V - - 1 Open Drain 0.5 mA Through Hole PDIP 8 5 x 4 x 1.75mm 1.75mm 5mm 5 V
RS Stock No. 168-8082
Mfr. Part No.TSC1021BIYPT
$1.504
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. 545-7625
Mfr. Part No.INA194AIDBVT
$3.96
Each (In a Pack of 5)
units
Single 12 V, 15 V, 3 V, 5 V, 9 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. 165-9509
Mfr. Part No.MAX9918ASA+
$3.353
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. 783-3955
Mfr. Part No.MAX9920ASA+
$2.32
Each (In a Pack of 2)
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
RS Stock No. 923-3713
Mfr. Part No.INA193AIDBVT
$2.539
Each (On a Reel of 250)
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. 162-8573
Mfr. Part No.INA219AIDCNR
$1.484
Each (On a Reel of 3000)
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. 162-5367
Mfr. Part No.INA202AIDGKT
$2.851
Each (On a Reel of 250)
units
- - - - - - - Surface Mount MSOP 8 3 x 3 x 0.97mm 0.97mm 3mm -
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