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. 145-7636
Mfr. Part No.INA219AID
kr 18,701
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. 817-6580
Mfr. Part No.INA219AID
kr 21,694
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. 825-3081
Mfr. Part No.INA213AIDCKR
kr 12,782
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. 162-8164
Mfr. Part No.INA199A3DCKT
kr 4,236
Each (On a Reel of 250)
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. 817-6546
Mfr. Part No.INA199A3DCKT
kr 7,398
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. 824-7083
Mfr. Part No.LMP8640MKE-T/NOPB
kr 20,00
Each (In a Pack of 5)
Units
Single 2.7 → 12 V - 103dB 1 Single Ended 2750 μA Surface Mount SOT-23 6 3.05 x 1.75 x 1mm 1mm 3.05mm 12 V
RS Stock No. 661-2491
Mfr. Part No.INA271AID
kr 24,82
Each
Units
Single 3 V, 5 V, 9 V, 12 V, 15 V - 80dB 1 - - Surface Mount SOIC 8 4.9 x 3.91 x 1.58mm 1.58mm 4.9mm 18 V
RS Stock No. 100-3849
Mfr. Part No.INA139NA/250
kr 10,21
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 40 V
RS Stock No. 545-7669
Mfr. Part No.INA198AIDBVT
kr 22,352
Each (In a Pack of 5)
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. 121-9732
Mfr. Part No.LMP8645HVMKE/NOPB
kr 16,486
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. 922-3322
Mfr. Part No.INA200AIDGKT
kr 14,634
Each (On a Reel of 250)
Units
- - - - - - - - - - - - - -
New
RS Stock No. 197-7169
Mfr. Part No.INA168NA/250
kr 19,402
Each (In a Pack of 5)
Units
Single 5 V - 100dB 1 Current - - SOT-23 5 - - - -
RS Stock No. 162-4671
Mfr. Part No.INA198AIDBVT
kr 15,262
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. 817-6603
Mfr. Part No.INA282AID
kr 30,848
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
New
RS Stock No. 197-7174
Mfr. Part No.INA213AIDCKT
kr 8,711
Each (On a Reel of 250)
Units
Single 5 V - 100dB 1 Voltage - - SC-70 6 - - - -
RS Stock No. 121-9269
Mfr. Part No.INA219BIDCNT
kr 15,731
Each (On a Reel of 250)
Units
- - - - - - - Surface Mount SOT-23 8 3 x 1.75 x 1.3mm 1.3mm 3mm -
RS Stock No. 162-6303
Mfr. Part No.LMP8603MA/NOPB
kr 14,268
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 3 x 3 x 0.86mm 0.86mm 3mm 5.5 V
RS Stock No. 545-7631
Mfr. Part No.INA195AIDBVT
kr 22,212
Each (In a Pack of 5)
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. 121-9343
Mfr. Part No.LMP8640MKE-F/NOPB
kr 9,846
Each (On a Reel of 250)
Units
Dual - ±12 V, ±2.7 V, ±5 V 103dB 1 Buffered 800 μA Surface Mount SOT-23 6 3.05 x 1.75 x 1mm 1mm 3.05mm 12 V
RS Stock No. 100-3851
Mfr. Part No.INA169NA/250
kr 15,262
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