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. 732-8380
Mfr. Part No.MAX4070AUA+
SGD3.74
Each
units
Single 2.7 → 24 V - 100dB 1 Rail to Rail 0.25 mA Surface Mount μMAX 8 3.05 x 3.05 x 0.95mm 0.95mm 3.05mm 24 V
RS Stock No. 168-8817
Mfr. Part No.CS30BL
SGD0.779
Each (On a Reel of 3000)
units
Single 2.8 → 30 V - - 2 Single Ended - Surface Mount SOT-23 5 3 x 1.75 x 1.3mm 1.3mm 3mm -
RS Stock No. 159-7872
Mfr. Part No.AD8215YRZ
SGD3.53
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 5.5 V
RS Stock No. 912-6215
Mfr. Part No.AD8210WYRZ
SGD5.80
Each (In a Tube of 98)
units
Single 5 V - - 1 - - Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 5.5 V
RS Stock No. 170-8232
Mfr. Part No.ISL28006FH50Z-T7A
SGD3.318
Each (On a Reel of 250)
units
Single 2.7 → 28 V - 105dB 1 - 50 μA Surface Mount SOT-23 5 2.9 x 1.6 x 1.14mm 1.14mm 2.9mm 28 V
RS Stock No. 795-9259
Mfr. Part No.TSC103IPT
SGD2.05
Each (In a Pack of 2)
units
Dual, Single 2.9 → 70 V -2.1 → 65V 90dB 1 Buffered 480 μA Surface Mount TSSOP 8 4.5 x 3.1 x 1.05mm 1.05mm 4.5mm 5.5 V
RS Stock No. 197-7163
Mfr. Part No.INA138NA/250
SGD2.994
Each (In a Pack of 5)
units
Single 5 V - 100dB 1 Current - - SOT-23 5 - - - -
RS Stock No. 817-6580
Mfr. Part No.INA219AID
SGD3.544
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. 190-6610
Mfr. Part No.MAX9611AUB+T
SGD4.132
Each (In a Pack of 5)
units
Single 2.7 → 5.5 V - 84dB 1 Rail to Rail 2.6 mA Surface Mount μMAX 10 3.16 x 3.12 x 0.95mm 0.95mm 3.16mm 5.5 V
RS Stock No. 661-3352
Mfr. Part No.INA200AIDGKT
SGD4.376
Each (In a Pack of 5)
units
- - - - - - - Surface Mount MSOP 8 3 x 3 x 0.97mm 0.97mm 3mm -
RS Stock No. 922-8232
Mfr. Part No.ZXCT1109SA-7
SGD0.565
Each (On a Reel of 3000)
units
- - - - - - - - - - - - - -
RS Stock No. 709-7095
Mfr. Part No.AD8273ARZ
SGD6.33
Each
units
Dual - ±12 V, ±15 V, ±3 V, ±5 V, ±9 V 77dB 2 - 5 mA Surface Mount SOIC N 14 8.75 x 4 x 1.5mm 1.5mm 8.75mm ±18 V
RS Stock No. 190-6299
Mfr. Part No.MAX4081SASA+
SGD3.886
Each (In a Pack of 5)
units
Single 4.5 → 76 V - 100dB 1 Voltage 190 μA Surface Mount SO 8 5 x 4 x 1.5mm 1.5mm 5mm 76 V
RS Stock No. 178-4554
Mfr. Part No.NCS199A1RSQT2G
SGD1.091
Each (In a Pack of 50)
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. 190-4308
Mfr. Part No.MAX4081TASA+
SGD3.296
Each (In a Tube of 100)
units
Single 4.5 → 76 V - 100dB 1 Voltage 190 μA Surface Mount SO 8 5 x 4 x 1.5mm 1.5mm 5mm 76 V
RS Stock No. 189-0234
Mfr. Part No.NCS211RSQT2G
SGD0.498
Each (On a Reel of 3000)
units
Single 5 V - 105dB 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. 190-6404
Mfr. Part No.MAX4080SAUA+T
SGD3.224
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. 920-9846
Mfr. Part No.NCS199A3SQT2G
SGD1.017
Each (In a Pack of 10)
units
Single 2.7 → 26 V - 100dB 1 Rail to Rail 5 mA Surface Mount SC-70 6 2.2 x 1.35 x 1mm 1mm 2.2mm 26 V
RS Stock No. 189-8918
Mfr. Part No.MAX9918ASA+
SGD3.05
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. 545-7669
Mfr. Part No.INA198AIDBVT
SGD3.83
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
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