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. 159-9535
Mfr. Part No.AD8418AWBRZ
£1.676
Each (In a Tube of 98)
Units
Single 2.7 → 5.5 V - 90dB 1 Buffered 4.1 mA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 5.5 V
RS Stock No. 162-6300
Mfr. Part No.LMP8601MA/NOPB
£2.402
Each (In a Tube of 95)
Units
Single 5 V - 80dB 1 Bidirectional, Differential, Rail to Rail, Unidirectional 1.3 mA Surface Mount SOIC 8 4.9 x 3.9 x 1.45mm 1.45mm 4.9mm 5.5 V
RS Stock No. 817-6580
Mfr. Part No.INA219AID
£2.00
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. 761-6330
Mfr. Part No.LMP8602MME/NOPB
£2.94
Each
Units
Single 5 V - 80dB 1 Bidirectional, Differential, Rail to Rail, Unidirectional 1.3 mA Surface Mount MSOP 8 4.9 x 3.9 x 1.45mm 1.45mm 4.9mm 5.5 V
RS Stock No. 912-9914
Mfr. Part No.AD8218BRMZ
£1.555
Each (In a Tube of 50)
Units
Single 4 → 80 V - 90dB 1 Rail to Rail 60 μA Surface Mount MSOP 8 3.2 x 3.2 x 0.95mm 0.95mm 3.2mm 80 V
RS Stock No. 824-7086
Mfr. Part No.LMP8645HVMKE/NOPB
£2.205
Each (In a Pack of 2)
Units
Single 2.7 → 12 V - 95dB 1 Single Ended 2700 μA Surface Mount SOT-23 6 3.05 x 1.75 x 1mm 1mm 3.05mm 12 V
RS Stock No. 160-4523
Mfr. Part No.AD8213YRMZ
£2.989
Each (In a Tube of 50)
Units
Single 5 V - 100dB 2 Buffered 3.7 mA Surface Mount MSOP 10 3.1 x 3.1 x 0.95mm 0.95mm 3.1mm 5.5 V
RS Stock No. 121-9732
Mfr. Part No.LMP8645HVMKE/NOPB
£1.445
Each (On a Reel of 250)
Units
Single 2.7 → 12 V - 95dB 1 Single Ended 2700 μA Surface Mount SOT-23 6 3.05 x 1.75 x 1mm 1mm 3.05mm 12 V
RS Stock No. 160-9848
Mfr. Part No.AD8418AWBRMZ
£1.676
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. 817-6546
Mfr. Part No.INA199A3DCKT
£0.628
Each (In a Pack of 5)
Units
Single 2.7 → 26 V - 100dB 1 Bidirectional 100 μA Surface Mount SC-70 6 2.15 x 1.4 x 1mm 1mm 2.15mm 26 V
RS Stock No. 919-9550
Mfr. Part No.LTC6101BIS5#TRMPBF
£1.951
Each (On a Reel of 500)
Units
Single 4 → 60 V 4 → 60V - 1 Unidirectional 0.64 mA Surface Mount TSOT-23 5 2.9 x 1.75 x 0.9mm 0.9mm 2.9mm 60 V
RS Stock No. 145-7636
Mfr. Part No.INA219AID
£1.62
Each (In a Tube of 75)
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. 764-8744
Mfr. Part No.AD8218BRMZ
£2.02
Each
Units
Single 4 → 80 V - 90dB 1 Rail to Rail 60 μA Surface Mount MSOP 8 3.2 x 3.2 x 0.95mm 0.95mm 3.2mm 80 V
RS Stock No. 817-6534
Mfr. Part No.INA199A2DCKT
£0.634
Each (In a Pack of 5)
Units
Single 2.7 → 26 V - 100dB 1 Bidirectional 100 μA Surface Mount SC-70 6 2.15 x 1.4 x 1mm 1mm 2.15mm 26 V
RS Stock No. 817-6616
Mfr. Part No.INA286AID
£2.332
Each (In a Pack of 5)
Units
Single 2.7 → 18 V - 120dB 1 Bidirectional 900 μA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 18 V
RS Stock No. 921-2959
Mfr. Part No.INA286AID
£2.107
Each (In a Tube of 75)
Units
Single 2.7 → 18 V - 120dB 1 Bidirectional 900 μA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 18 V
RS Stock No. 786-9718
Mfr. Part No.LT6100IMS8#PBF
£2.50
Each (In a Pack of 2)
Units
Single 2.7 → 36 V - 100dB 1 Differential 145 μA Surface Mount MSOP 8 3 x 3 x 0.86mm 0.86mm 3mm 36 V
RS Stock No. 920-9833
Mfr. Part No.NCS199A1SQT2G
£0.488
Each (In a Pack of 10)
Units
Single 2.7 → 26 V - 97dB 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. 121-8924
Mfr. Part No.INA197AIDBVT
£1.51
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. 122-0315
Mfr. Part No.ZXCT1082E5TA
£0.553
Each (On a Reel of 3000)
Units
- 2.7 to 60 V - 80dB - - - - - - - - - -
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