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. 540-3791
Mfr. Part No.MAX4172ESA+
BrandMaxim
£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. 146-1151
Mfr. Part No.MAX4172ESA+
BrandMaxim
£2.009
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. 154-920
Mfr. Part No.ZXCT1009FTA
£0.754
Each (In a Pack of 5)
Units
- 2.5 → 20 V - - - - - Surface Mount SOT-23 3 3.05 x 1.4 x 1mm 1mm 3.05mm -
RS Stock No. 922-7617
Mfr. Part No.ZXCT1009FTA
£0.343
Each (On a Reel of 3000)
Units
- 2.5 → 20 V - - - - - Surface Mount SOT-23 3 3.05 x 1.4 x 1mm 1mm 3.05mm -
RS Stock No. 865-5699
Mfr. Part No.IR2175PBF
BrandInfineon
£2.615
Each (In a Tube of 2)
Units
Single 5 V - - 1 Open Drain 0.5 mA Through Hole PDIP 8 5 x 4 x 1.75mm 1.75mm 5mm 5 V
RS Stock No. 165-5474
Mfr. Part No.IR2175PBF
BrandInfineon
£2.215
Each (In a Tube of 50)
Units
Single 5 V - - 1 Open Drain 0.5 mA Through Hole PDIP 8 5 x 4 x 1.75mm 1.75mm 5mm 5 V
RS Stock No. 461-6586
Mfr. Part No.INA169NA/250
£2.01
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. 100-3851
Mfr. Part No.INA169NA/250
£1.392
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 60 V
RS Stock No. 160-1727
Mfr. Part No.AD8219BRMZ
£1.725
Each (In a Tube of 50)
Units
Single -0.3 → 85 V - 94dB 1 Unidirectional 130 Bias μA Surface Mount MSOP 8 3.2 x 3.2 x 0.95mm 0.95mm 3.2mm 80 V
RS Stock No. 806-7907
Mfr. Part No.AD8219BRMZ
£2.125
Each (In a Pack of 2)
Units
Single -0.3 → 85 V - 94dB 1 Unidirectional 130 Bias μA Surface Mount MSOP 8 3.2 x 3.2 x 0.95mm 0.95mm 3.2mm 80 V
RS Stock No. 162-8573
Mfr. Part No.INA219AIDCNR
£0.768
Each (On a Reel of 3000)
Units
Single 6 V - 100dB 1 Digital 5 mA Surface Mount SOT-23 8 3 x 1.75 x 1.3mm 1.3mm 3mm 5.5 V
RS Stock No. 825-3088
Mfr. Part No.INA219AIDCNR
£1.656
Each (In a Pack of 5)
Units
Single 6 V - 100dB 1 Digital 5 mA Surface Mount SOT-23 8 3 x 1.75 x 1.3mm 1.3mm 3mm 5.5 V
RS Stock No. 661-3407
Mfr. Part No.XTR111AIDGQT
£2.01
Each
Units
- - - - - - - Surface Mount HTSSOP 10 3 x 3 x 1.02mm 1.02mm 3mm -
RS Stock No. 732-8425
Mfr. Part No.MAX4372FEUK+T
BrandMaxim
£1.724
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
BrandMaxim
£0.931
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. 100-3828
Mfr. Part No.INA138NA/250
£1.049
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 36 V
RS Stock No. 835-3793
Mfr. Part No.AD8418ABRMZ-RL
£2.213
Each (In a Pack of 3)
Units
Single 5 V - 90dB 1 Buffered 4.1 mA Surface Mount MSOP 8 3.2 x 3.2 x 0.95mm 0.95mm 3.2mm 5.5 V
RS Stock No. 378-2755
Mfr. Part No.INA138NA/250
£2.01
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 36 V
RS Stock No. 160-9876
Mfr. Part No.AD8418ABRMZ-RL
£1.116
Each (On a Reel of 3000)
Units
Single 5 V - 90dB 1 Buffered 4.1 mA Surface Mount MSOP 8 3.2 x 3.2 x 0.95mm 0.95mm 3.2mm 5.5 V
RS Stock No. 506-0417
Mfr. Part No.LT1787HVCS8#PBF
£5.65
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
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