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. 786-1108
Mfr. Part No.MAX4173TESA+
SGD3.052
Each (In a Pack of 5)
units
Single 3 → 28 V - 90dB 1 Differential 1 mA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 28 V
RS Stock No. 190-4343
Mfr. Part No.MAX44284FAUT+T
SGD1.83
Each (On a Reel of 2500)
units
Single 1.7 → 5.5 V - 91.3dB 1 Voltage 41.5 μA Surface Mount SOT-23 6 3 x 1.75 x 1.3mm 1.3mm 3mm 5.5 V
RS Stock No. 783-3955
Mfr. Part No.MAX9920ASA+
SGD3.00
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. 191-3962
Mfr. Part No.MAX4378FAUD+
SGD4.903
Each (In a Tube of 96)
units
Single 3 → 28 V - 90dB - Voltage 2.2 mA Surface Mount TSSOP 14 5.1 x 4.5 x 0.95mm 0.95mm 5.1mm 28 V
RS Stock No. 189-7318
Mfr. Part No.MAX4372FESA+
SGD2.383
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. 190-4375
Mfr. Part No.MAX9634TEUK+T
SGD1.395
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. 191-5282
Mfr. Part No.MAX4377HASA+
SGD3.435
Each (In a Tube of 100)
units
Dual - ±8V 90dB 1 Buffered 2.2 mA Surface Mount SO 8 5 x 4 x 1.5mm 1.5mm 5mm 28 V
RS Stock No. 190-4331
Mfr. Part No.MAX4376TAUK+T
SGD1.943
Each (On a Reel of 2500)
units
Single 3 → 28 V - 90dB 1 Buffered 2.2 mA Surface Mount SOT-23 5 3 x 1.75 x 1.3mm 1.3mm 3mm 28 V
RS Stock No. 190-6341
Mfr. Part No.MAX4373TEUA+
SGD5.10
Each (In a Pack of 5)
units
Single 2.7 → 28 V - 85 (Typ.)dB 1 Voltage 100 μA Surface Mount μMAX 8 3.1 x 3.1 x 0.95mm 0.95mm 3.1mm 28 V
RS Stock No. 191-3435
Mfr. Part No.MAX9938HEUK+T
SGD1.908
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. 191-4880
Mfr. Part No.MAX4378FAUD+
SGD5.764
Each (In a Pack of 5)
units
Single 3 → 28 V - 90dB - Voltage 2.2 mA Surface Mount TSSOP 14 5.1 x 4.5 x 0.95mm 0.95mm 5.1mm 28 V
RS Stock No. 190-6433
Mfr. Part No.MAX9938FEUK+T
SGD1.908
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. 191-5163
Mfr. Part No.MAX9919FASA+
SGD3.50
Each (In a Pack of 5)
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. 191-6982
Mfr. Part No.MAX4377HASA+
SGD4.13
Each (In a Pack of 5)
units
Dual - ±8V 90dB 1 Buffered 2.2 mA Surface Mount SO 8 5 x 4 x 1.5mm 1.5mm 5mm 28 V
RS Stock No. 190-6445
Mfr. Part No.MAX9938TEUK+T
SGD1.78
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. 189-9010
Mfr. Part No.MAX9929FAUA+
SGD2.998
Each (In a Pack of 5)
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. 190-6673
Mfr. Part No.MAX9922EUB+
SGD4.978
Each (In a Pack of 5)
units
Single 2.85 → 5.5 V - 121dB 1 Rail to Rail 1500 μA Surface Mount μMAX 10 3.16 x 3.12 x 0.95mm 0.95mm 3.16mm 5.5 V
RS Stock No. 190-4344
Mfr. Part No.MAX44284HAUT+T
SGD1.874
Each (On a Reel of 2500)
units
Single 1.7 → 5.5 V - 91.3dB 1 Voltage 41.5 μA Surface Mount SOT-23 6 3 x 1.75 x 1.3mm 1.3mm 3mm 5.5 V
RS Stock No. 190-6559
Mfr. Part No.MAX4081SAUA+
SGD4.19
Each (In a Pack of 5)
units
Single 4.5 → 76 V - 100dB 1 Voltage 190 μA Surface Mount μMAX 8 3.1 x 3.1 x 0.95mm 0.95mm 3.1mm 76 V
RS Stock No. 189-7305
Mfr. Part No.MAX4173FESA+
SGD2.084
Each (In a Tube of 100)
units
Single 3 → 28 V - 90dB 1 Differential 1 mA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 28 V