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. 461-6586
Mfr. Part No.INA169NA/250
PHP133.35
Each
units
Single 12 V, 15 V, 18 V, 24 V, 28 V, 3 V, 5 V, 9 V - 100dB 1 - - Surface Mount SOT-23 5 2.9 x 1.6 x 1.15mm 1.15mm 2.9mm 60 V
RS Stock No. 423-478
Mfr. Part No.LTC6104CMS8#PBF
PHP219.86
Each
units
Single 12 V, 15 V, 18 V, 24 V, 28 V, 5 V, 9 V - - 1 - 1.04 mA Surface Mount MSOP 8 3 x 3 x 0.86mm 0.86mm 3mm 60 V
RS Stock No. 920-6311
Mfr. Part No.TSC101BILT
PHP35.203
Each (On a Reel of 3000)
units
Single 5 V, 9 V, 12 V, 15 V, 18 V - 90dB 1 - 0.3 mA Surface Mount SOT-23 5 3 x 1.75 x 1.3mm 1.3mm 3mm 24 V
RS Stock No. 100-3849
Mfr. Part No.INA139NA/250
PHP81.806
Each (On a Reel of 250)
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 40 V
RS Stock No. 461-6558
Mfr. Part No.INA139NA/250
PHP119.88
Each
units
Single 12 V, 15 V, 18 V, 24 V, 28 V, 3 V, 5 V, 9 V - 100dB 1 - - Surface Mount SOT-23 5 2.9 x 1.6 x 1.15mm 1.15mm 2.9mm 40 V
RS Stock No. 817-6603
Mfr. Part No.INA282AID
PHP216.604
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. 426-308
Mfr. Part No.TSC101BILT
PHP90.602
Each (In a Pack of 5)
units
Single 12 V, 15 V, 18 V, 5 V, 9 V - 90dB 1 - 0.3 mA Surface Mount SOT-23 5 3 x 1.75 x 1.3mm 1.3mm 3mm 24 V
RS Stock No. 921-2940
Mfr. Part No.INA282AID
PHP184.191
Each (In a Tube of 75)
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. 166-0789
Mfr. Part No.TSC101CILT
PHP35.895
Each (On a Reel of 3000)
units
Single 5 V, 9 V, 12 V, 15 V, 18 V - 90dB 1 - 0.3 mA Surface Mount SOT-23 5 3 x 1.75 x 1.3mm 1.3mm 3mm 24 V
RS Stock No. 506-0417
Mfr. Part No.LT1787HVCS8#PBF
PHP411.60
Each
units
Single 3 V, 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V - - 1 - 0.12 mA Surface Mount SOIC 8 5 x 3.99 x 1.48mm 1.48mm 5mm 60 V
RS Stock No. 545-7653
Mfr. Part No.INA197AIDBVT
PHP155.988
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. 145-6618
Mfr. Part No.LMP8602QMA/NOPB
PHP211.974
Each (In a Tube of 95)
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. 761-6330
Mfr. Part No.LMP8602MME/NOPB
PHP239.24
Each
units
Single 5 V - 80dB 1 Bidirectional, Differential, Rail to Rail, Unidirectional 1.3 mA Surface Mount MSOP 8 4.9 x 3.9 x 1.45mm 1.45mm 4.9mm 5.5 V
RS Stock No. 162-6300
Mfr. Part No.LMP8601MA/NOPB
PHP184.191
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 4.9 x 3.9 x 1.45mm 1.45mm 4.9mm 5.5 V
RS Stock No. 545-7631
Mfr. Part No.INA195AIDBVT
PHP206.22
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. 545-7647
Mfr. Part No.INA196AIDBVT
PHP162.582
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. 426-269
Mfr. Part No.TSC101CILT
PHP72.762
Each (In a Pack of 5)
units
Single 12 V, 15 V, 18 V, 5 V, 9 V - 90dB 1 - 0.3 mA Surface Mount SOT-23 5 3 x 1.75 x 1.3mm 1.3mm 3mm 24 V
RS Stock No. 121-9032
Mfr. Part No.INA170EA/250
PHP149.92
Each (On a Reel of 250)
units
Single 3 V, 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V - 100dB 1 - - Surface Mount MSOP 8 3 x 3 x 0.97mm 0.97mm 3mm 40 V
RS Stock No. 817-6580
Mfr. Part No.INA219AID
PHP137.886
Each (In a Pack of 5)
units
Single 3 → 5.5 V - 100dB 1 Bidirectional 1 mA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 5.5 V
RS Stock No. 761-6334
Mfr. Part No.LMP8603MA/NOPB
PHP216.60
Each
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