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 amplifierThere 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. 146-1151
Mfr. Part No.MAX4172ESA+
£1.955
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. 540-3791
Mfr. Part No.MAX4172ESA+
£2.43
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. 732-8425
Mfr. Part No.MAX4372FEUK+T
£1.42
Each (In a Pack of 5)
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. 923-6964
Mfr. Part No.MAX4372FEUK+T
£0.884
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. 732-8421
Mfr. Part No.MAX4372FESA+
£1.50
Each
Units
Single 2.7 → 28 V - - 1 Differential 0.06 mA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 28 V
RS Stock No. 165-9308
Mfr. Part No.MAX4372FESA+
£1.127
Each (In a Tube of 100)
Units
Single 2.7 → 28 V - - 1 Differential 0.06 mA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 28 V
RS Stock No. 732-7888
Mfr. Part No.MAX4080SASA+
£1.51
Each
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. 923-7917
Mfr. Part No.MAX4080SASA+
£1.221
Each (In a Tube of 100)
Units
- - - - - - - - - - - - - -
RS Stock No. 103-9965
Mfr. Part No.MAX4080SAUA+
£1.248
Each (In a Tube of 50)
Units
Single 4.5 → 76 V - 100dB 1 Rail to Rail 0.19 mA Surface Mount μMAX 8 3.1 x 3.1 x 0.95mm 0.95mm 3.1mm 76 V
RS Stock No. 732-7882
Mfr. Part No.MAX4080SAUA+
£1.46
Each
Units
Single 4.5 → 76 V - 100dB 1 Rail to Rail 0.19 mA Surface Mount μMAX 8 3.1 x 3.1 x 0.95mm 0.95mm 3.1mm 76 V
RS Stock No. 786-1322
Mfr. Part No.MAX9611AUB+
£1.88
Each (In a Pack of 2)
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
RS Stock No. 165-9409
Mfr. Part No.MAX9611AUB+
£1.592
Each (In a Tube of 50)
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
RS Stock No. 799-8412
Mfr. Part No.MAX9929FAUA+
£1.295
Each (In a Pack of 2)
Units
Single - - 87dB 2 Bidirectional, Unidirectional 20 μA Surface Mount μMAX 8 3.1 x 3.1 x 0.95mm 0.95mm 3.1mm 5.5 V
RS Stock No. 165-9687
Mfr. Part No.MAX9920ASA+
£0.963
Each (In a Tube of 100)
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. 783-3955
Mfr. Part No.MAX9920ASA+
£1.275
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. 165-4505
Mfr. Part No.MAX9929FAUA+
£1.099
Each (In a Tube of 50)
Units
Single - - 87dB 2 Bidirectional, Unidirectional 20 μA Surface Mount μMAX 8 3.1 x 3.1 x 0.95mm 0.95mm 3.1mm 5.5 V
RS Stock No. 732-8437
Mfr. Part No.MAX4372TEUK+T
£2.048
Each (In a Pack of 5)
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. 786-1379
Mfr. Part No.MAX9928FAUA+
£1.055
Each (In a Pack of 2)
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. 732-7894
Mfr. Part No.MAX4080TAUA+
£1.42
Each
Units
Single 4.5 → 76 V - 100dB 1 Rail to Rail 0.19 mA Surface Mount μMAX 8 3.1 x 3.1 x 0.95mm 0.95mm 3.1mm 76 V
RS Stock No. 165-9412
Mfr. Part No.MAX9928FAUA+
£1.041
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