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. 189-7290
Mfr. Part No.MAX4372TEUK+T
PHP64.773
Each (On a Reel of 2500)
units
Single 2.7 → 28 V - - 1 Differential 0.06 mA Surface Mount SOT-23 5 3 x 1.75 x 1.3mm 1.3mm 3mm 28 V
RS Stock No. 190-6625
Mfr. Part No.MAX9634FEUK+T
PHP70.156
Each (In a Pack of 5)
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. 185-8847
Mfr. Part No.NCS199A3RSQT2G
PHP36.363
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. 158-5274
Mfr. Part No.AD22057RZ
PHP596.93
Each (In a Tube of 98)
units
Single 5 V - 80dB 1 - - Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 36 V
RS Stock No. 178-4384
Mfr. Part No.NCS199A1RSQT2G
PHP15.888
Each (On a Reel of 3000)
units
Single 5 V - 100dB 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. 190-6368
Mfr. Part No.MAX4073TAUT+T
PHP85.15
Each (In a Pack of 5)
units
Single 3 → 28 V - 90 (Typ.)dB 1 Voltage 1.2 mA Surface Mount SOT-23 6 3 x 1.75 x 1.3mm 1.3mm 3mm 28 V
RS Stock No. 186-1444
Mfr. Part No.NCS211RMUTAG
PHP36.363
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. 923-6905
Mfr. Part No.INA211AIDCKT
PHP53.55
Each (On a Reel of 250)
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. 168-4352
Mfr. Part No.LTC4151CDD#PBF
PHP267.091
Each (In a Tube of 121)
units
Single 7 → 80 V - - 1 Open Collector 1.7 mA Surface Mount DFN 10 3 x 3 x 0.7mm 0.7mm 3mm 80 V
New
RS Stock No. 202-4811
Mfr. Part No.TSC2011IDT
PHP119.742
Each (In a Pack of 5)
units
Single 5.5 V - 85dB 1 Bidirectional - - SO8 8 - - - -
RS Stock No. 190-4315
Mfr. Part No.MAX4173HESA+
PHP73.22
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. 183-1761
Mfr. Part No.AD8417WHRMZ
PHP151.70
Each (In a Tube of 50)
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
RS Stock No. 779-9482
Mfr. Part No.LT1787CS8#PBF
PHP257.725
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. 178-4387
Mfr. Part No.NCS214RMUTAG
PHP15.851
Each (On a Reel of 3000)
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
New
RS Stock No. 203-3515
Mfr. Part No.TSC2012IST
PHP119.742
Each (In a Pack of 5)
units
Single 2.7 V, 5.5 V - 115dB 1 Bidirectional - - MiniSO8 8 - - - -
RS Stock No. 178-4424
Mfr. Part No.NCS214RMUTAG
PHP36.363
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. 190-4298
Mfr. Part No.MAX4071AUA+
PHP94.314
Each (In a Tube of 50)
units
Single 2.7 → 24 V - 100dB 1 Bidirectional 250 μA Surface Mount μMAX 8 3.1 x 3.1 x 0.95mm 0.95mm 3.1mm 24 V
RS Stock No. 169-0204
Mfr. Part No.SI8920BC-IP
PHP135.422
Each (In a Tube of 50)
units
Single 3 → 5.5 V - - 2 Differential 5.5 mA Through Hole DIP 8 9.9 x 6.6 x 3.44mm 3.44mm 9.9mm 5.5 V
RS Stock No. 155-7545
Mfr. Part No.LTC4151IDD#PBF
PHP229.281
Each (In a Tube of 141)
units
Single 4.5 → 5.5 V - - 1 Open Collector 1.7 mA Surface Mount DFN 10 3 x 3 x 0.7mm 0.7mm 3mm 80 V
RS Stock No. 922-3322
Mfr. Part No.INA200AIDGKT
PHP77.088
Each (On a Reel of 250)
units
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