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. 709-7076
Mfr. Part No.AD8215YRZ
kr 28,48
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. 145-7636
Mfr. Part No.INA219AID
kr 22,871
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. 920-9846
Mfr. Part No.NCS199A3SQT2G
Brandonsemi
kr 2,277
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. 122-3297
Mfr. Part No.ZXCT1020E5TA
kr 6,12
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. 738-5272
Mfr. Part No.ZXCT1107SA-7
kr 9,218
Each (In a Pack of 5)
Units
- - - - - - - - - - - - - -
RS Stock No. 163-0173
Mfr. Part No.NCS199A3SQT2G
Brandonsemi
kr 2,27
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. 817-6580
Mfr. Part No.INA219AID
kr 26,83
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. 824-5475
Mfr. Part No.ZXCT1020E5TA
kr 13,241
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. 764-8744
Mfr. Part No.AD8218BRMZ
kr 25,00
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. 822-5844
Mfr. Part No.LT1999IMS8-20#PBF
kr 47,615
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. 922-8238
Mfr. Part No.ZXCT1107SA-7
kr 3,90
Each (On a Reel of 3000)
Units
- - - - - - - - - - - - - -
RS Stock No. 168-8818
Mfr. Part No.CS30CL
kr 5,73
Each (On a Reel of 3000)
Units
Single 2.8 → 30 V - - 2 Single Ended - Surface Mount SOT-23 5 3 x 1.75 x 1.3mm 1.3mm 3mm -
RS Stock No. 121-9269
Mfr. Part No.INA219BIDCNT
kr 19,141
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. 154-7664
Mfr. Part No.LTC6101BCS5#TRMPBF
kr 23,73
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. 190-1271
Mfr. Part No.MAX4080TAUA+
kr 24,982
Each (In a Pack of 5)
Units
Single 4.5 → 76 V - 100dB 1 Rail to Rail 0.19 mA Surface Mount μMAX 8 3.1 x 3.1 x 0.95mm 0.95mm 3.1mm 76 V
RS Stock No. 191-4007
Mfr. Part No.MAX9919FASA+
kr 17,763
Each (In a Tube of 100)
Units
Single 4.5 → 5.5 V - 96dB 1 Rail to Rail 2.2 mA Surface Mount SOIC 8 4.98 x 3.99 x 1.58mm 1.58mm 4.98mm 5.5 V
RS Stock No. 189-8953
Mfr. Part No.MAX9919NASA+
kr 24,156
Each (In a Pack of 5)
Units
Single 4.5 → 5.5 V - 80dB 1 Rail to Rail 2.2 mA Surface Mount SOIC 8 4.98 x 3.99 x 1.58mm 1.58mm 4.98mm 5.5 V
RS Stock No. 190-4390
Mfr. Part No.MAX9938TEUK+T
kr 8,299
Each (On a Reel of 2500)
Units
Single 1.6 → 28 V - 94dB 1 Voltage 2.5 μA Surface Mount SOT-23 5 3 x 1.75 x 1.3mm 1.3mm 3mm 28 V
RS Stock No. 212-2553
Mfr. Part No.MAX40204ANA+T
kr 18,046
Each (In a Pack of 5)
Units
Single 5.5 V 36V 110dB 2 Bidirectional - - 8-Bump WLP 8 - - - -
RS Stock No. 901-3976
Mfr. Part No.Si8920BC-IP
kr 32,29
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