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. 159-7872
Mfr. Part No.AD8215YRZ
kr 22,03
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. 709-7076
Mfr. Part No.AD8215YRZ
kr 26,42
Each
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. 920-9846
Mfr. Part No.NCS199A3SQT2G
kr 5,653
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. 920-9833
Mfr. Part No.NCS199A1SQT2G
kr 5,643
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. 922-8238
Mfr. Part No.ZXCT1107SA-7
kr 3,435
Each (On a Reel of 3000)
Units
- - - - - - - - - - - - - -
RS Stock No. 162-8164
Mfr. Part No.INA199A3DCKT
kr 3,845
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. 738-5272
Mfr. Part No.ZXCT1107SA-7
kr 7,318
Each (In a Pack of 5)
Units
- - - - - - - - - - - - - -
RS Stock No. 764-8744
Mfr. Part No.AD8218BRMZ
kr 22,43
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. 824-5475
Mfr. Part No.ZXCT1020E5TA
kr 8,564
Each (In a Pack of 10)
Units
Single 2.5 → 20 V - - 1 Low Offset Current 35 μA Surface Mount SOT-23 5 3.1 x 1.8 x 1.3mm 1.3mm 3.1mm 20 V
RS Stock No. 163-0171
Mfr. Part No.NCS199A1SQT2G
kr 2,805
Each (On a Reel of 3000)
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. 145-7636
Mfr. Part No.INA219AID
kr 20,658
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. 145-1310
Mfr. Part No.LT1999IMS8-20#PBF
kr 31,063
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. 825-3081
Mfr. Part No.INA213AIDCKR
kr 10,508
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. 779-9568
Mfr. Part No.LT2940IMS#PBF
kr 52,14
Each
Units
Single 80 V - - 1 Bidirectional 5 mA Surface Mount MSOP 12 4.039 x 3 x 0.86mm 0.86mm 4.04mm 80 V
RS Stock No. 122-3297
Mfr. Part No.ZXCT1020E5TA
kr 5,051
Each (On a Reel of 3000)
Units
Single 2.5 → 20 V - - 1 Low Offset Current 35 μA Surface Mount SOT-23 5 3.1 x 1.8 x 1.3mm 1.3mm 3.1mm 20 V
RS Stock No. 155-5368
Mfr. Part No.LT2940IMS#PBF
kr 34,736
Each (In a Tube of 37)
Units
Single 80 V - - 1 Bidirectional 5 mA Surface Mount MSOP 12 4.039 x 3 x 0.86mm 0.86mm 4.04mm 80 V
RS Stock No. 822-5844
Mfr. Part No.LT1999IMS8-20#PBF
kr 43,17
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. 817-6546
Mfr. Part No.INA199A3DCKT
kr 6,70
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. 163-0173
Mfr. Part No.NCS199A3SQT2G
kr 2,805
Each (On a Reel of 3000)
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. 912-9914
Mfr. Part No.AD8218BRMZ
kr 18,458
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
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