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 64,68
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. 824-5475
Mfr. Part No.ZXCT1020E5TA
kr 17,275
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. 163-0173
Mfr. Part No.NCS199A3SQT2G
Brandonsemi
kr 2,462
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. 920-9846
Mfr. Part No.NCS199A3SQT2G
Brandonsemi
kr 2,519
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. 922-8238
Mfr. Part No.ZXCT1107SA-7
kr 5,408
Each (On a Reel of 3000)
Units
- - - - - - - - - - - - - -
RS Stock No. 145-7636
Mfr. Part No.INA219AID
kr 29,288
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. 738-5272
Mfr. Part No.ZXCT1107SA-7
kr 12,72
Each (In a Pack of 5)
Units
- - - - - - - - - - - - - -
RS Stock No. 122-3297
Mfr. Part No.ZXCT1020E5TA
kr 8,588
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. 817-6580
Mfr. Part No.INA219AID
kr 34,418
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. 426-308
Mfr. Part No.TSC101BILT
kr 40,746
Each (In a Pack of 5)
Units
Single 12 V, 15 V, 18 V, 5 V, 9 V - 90dB 1 - 0.3 mA Surface Mount SOT-23 5 3 x 1.75 x 1.3mm 1.3mm 3mm 24 V
RS Stock No. 170-8124
Mfr. Part No.ISL28022FRZ-T7A
BrandIntersil
kr 31,814
Each (On a Reel of 250)
Units
Single 3.3 V - 110dB 2 Open Drain 0.7 mA Surface Mount QFN 16 3 x 3 x 0.85mm 0.85mm 3mm 5.5 V
RS Stock No. 169-0202
Mfr. Part No.SI8920AC-IP
kr 64,091
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. 234-8924
Mfr. Part No.TSC213IYCT
kr 15,049
Each (On a Reel of 3000)
Units
Single 2.7 → 26 V - 105dB - - - - SC70-6 6 - - - -
RS Stock No. 202-4761
Mfr. Part No.TSC2011IDT
kr 70 956,00
1 Reel of 2500
Reel(s)
Single 5.5 V - 85dB 1 Bidirectional - - SO8 8 - - - -
RS Stock No. 170-8125
Mfr. Part No.ISL28023FR12Z-T7A
BrandIntersil
kr 32,072
Each (On a Reel of 250)
Units
Single 3.3 V - 136dB 2 Open Drain 1.24 mA Surface Mount QFN 24 4 x 4 x 0.85mm 0.85mm 4mm 5.5 V
RS Stock No. 190-6341
Mfr. Part No.MAX4373TEUA+
kr 71,382
Each (In a Pack of 5)
Units
Single 2.7 → 28 V - 85 (Typ.)dB 1 Voltage 100 μA Surface Mount μMAX 8 3.1 x 3.1 x 0.95mm 0.95mm 3.1mm 28 V
RS Stock No. 234-8927
Mfr. Part No.TSC214IYCT
kr 18,156
Each (In a Pack of 5)
Units
Single 2.7 → 26 V - 105dB - - - - SC70-6 6 - - - -
RS Stock No. 545-7647
Mfr. Part No.INA196AIDBVT
kr 36,788
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
New
RS Stock No. 249-4943
Mfr. Part No.LMP8645MKE/NOPB
kr 23,846
Each (On a Reel of 250)
Units
Single 2.7 to 12 V - 85dB 1 - - - SOT-23-THIN 6 - - - -
RS Stock No. 234-8925
Mfr. Part No.TSC213IYCT
kr 18,156
Each (In a Pack of 5)
Units
Single 2.7 → 26 V - 105dB - - - - SC70-6 6 - - - -