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. 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
RS Stock No. 545-7603
Mfr. Part No.INA193AIDBVT
£2.028
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
RS Stock No. 923-3713
Mfr. Part No.INA193AIDBVT
£1.392
Each (On a Reel of 250)
Units
Single 3 V, 5 V, 9 V, 12 V, 15 V - 80dB 1 - - Surface Mount SOT-23 5 2.9 x 1.6 x 1.15mm 1.15mm 2.9mm 18 V
RS Stock No. 165-5536
Mfr. Part No.IR25750LTRPBF
BrandInfineon
£0.248
Each (On a Reel of 3000)
Units
Single -5 → 600 V - - 1 Single Ended - Surface Mount SOT-23 5 3 x 1.75 x 1.3mm 1.3mm 3mm 600 V
RS Stock No. 879-3375
Mfr. Part No.IR25750LTRPBF
BrandInfineon
£0.48
Each (In a Pack of 10)
Units
Single -5 → 600 V - - 1 Single Ended - Surface Mount SOT-23 5 3 x 1.75 x 1.3mm 1.3mm 3mm 600 V
RS Stock No. 825-3081
Mfr. Part No.INA213AIDCKR
£1.158
Each (In a Pack of 5)
Units
Single 5 V - 105dB 1 Analogue 5 mA Surface Mount SC-70 6 2.15 x 1.4 x 1mm 1mm 2.15mm 26 V
RS Stock No. 100-3850
Mfr. Part No.INA168NA/250
£1.225
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. 461-6564
Mfr. Part No.INA168NA/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. 160-8581
Mfr. Part No.AD8418BRMZ
£0.961
Each (In a Tube of 50)
Units
Single 5 V - 90dB 1 Bidirectional 130 μA Surface Mount MSOP 8 3.2 x 3.2 x 0.95mm 0.95mm 3.2mm 5.5 V
RS Stock No. 820-9390
Mfr. Part No.AD8418BRMZ
£0.944
Each (In a Pack of 5)
Units
Single 5 V - 90dB 1 Bidirectional 130 μA Surface Mount MSOP 8 3.2 x 3.2 x 0.95mm 0.95mm 3.2mm 5.5 V
RS Stock No. 145-0965
Mfr. Part No.LT6105CMS8#PBF
£1.284
Each (In a Tube of 50)
Units
Single 2.85 → 36 V - 120dB 1 Unidirectional 350 μA Surface Mount MSOP 8 3 x 3 x 0.86mm 0.86mm 3mm 36 V
RS Stock No. 820-9797
Mfr. Part No.AD8418WBRZ
£2.087
Each (In a Pack of 7)
Units
Single 5 V - 90dB 1 Bidirectional 130 μA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 5.5 V
RS Stock No. 121-6917
Mfr. Part No.AD8418WBRZ
£1.597
Each (In a Tube of 98)
Units
Single 5 V - 90dB 1 Bidirectional 130 μA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 5.5 V
RS Stock No. 145-1310
Mfr. Part No.LT1999IMS8-20#PBF
£2.773
Each (In a Tube of 50)
Units
Single 4.5 → 5.5 V - 80dB 1 Buffered, Rail to Rail 7.1 mA Surface Mount MSOP 8 3 x 3 x 0.9984mm 0.998mm 3mm 5.5 V
RS Stock No. 822-5844
Mfr. Part No.LT1999IMS8-20#PBF
£4.175
Each (In a Pack of 2)
Units
Single 4.5 → 5.5 V - 80dB 1 Buffered, Rail to Rail 7.1 mA Surface Mount MSOP 8 3 x 3 x 0.9984mm 0.998mm 3mm 5.5 V
RS Stock No. 851-6819
Mfr. Part No.LT6105CMS8#PBF
£1.93
Each (In a Pack of 5)
Units
Single 2.85 → 36 V - 120dB 1 Unidirectional 350 μA Surface Mount MSOP 8 3 x 3 x 0.86mm 0.86mm 3mm 36 V
RS Stock No. 901-3967
Mfr. Part No.Si8920AC-IP
£3.755
Each (In a Pack of 2)
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. 169-0202
Mfr. Part No.SI8920AC-IP
£3.381
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. 796-8912
Mfr. Part No.AD8211YRJZ-R2
£2.166
Each (In a Pack of 5)
Units
Single 5 V - 100dB 1 Buffered 2 mA Surface Mount SOT-23 5 3 x 1.7 x 1.3mm 1.3mm 3mm 5.5 V
RS Stock No. 159-9339
Mfr. Part No.AD8211YRJZ-R2
£1.441
Each (On a Reel of 250)
Units
Single 5 V - 100dB 1 Buffered 2 mA Surface Mount SOT-23 5 3 x 1.7 x 1.3mm 1.3mm 3mm 5.5 V
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