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. 761-6328
Mfr. Part No.LMP8601MA/NOPB
HK$31.45
Each
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. 162-6300
Mfr. Part No.LMP8601MA/NOPB
HK$32.161
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. 921-2940
Mfr. Part No.INA282AID
HK$32.161
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. 817-6603
Mfr. Part No.INA282AID
HK$37.822
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. 825-3081
Mfr. Part No.INA213AIDCKR
HK$12.758
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. 661-3407
Mfr. Part No.XTR111AIDGQT
HK$19.86
Each
units
- - - - - - - Surface Mount HTSSOP 10 3 x 3 x 1.02mm 1.02mm 3mm -
RS Stock No. 100-3849
Mfr. Part No.INA139NA/250
HK$13.278
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. 121-9269
Mfr. Part No.INA219BIDCNT
HK$16.17
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. 168-4361
Mfr. Part No.INA213AIDCKR
HK$4.736
Each (On a Reel of 3000)
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. 730-0556
Mfr. Part No.INA219BIDCNT
HK$25.97
Each
units
- - - - - - - Surface Mount SOT-23 8 3 x 1.75 x 1.3mm 1.3mm 3mm -
RS Stock No. 461-6558
Mfr. Part No.INA139NA/250
HK$18.24
Each
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. 922-3344
Mfr. Part No.XTR111AIDGQT
HK$11.771
Each (On a Reel of 250)
units
- - - - - - - - - - - - - -
RS Stock No. 145-6618
Mfr. Part No.LMP8602QMA/NOPB
HK$37.013
Each (In a Tube of 95)
units
Single 5 V - 90dB 1 Bidirectional 1.3 mA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 60 V
RS Stock No. 817-6584
Mfr. Part No.INA220AIDGST
HK$23.576
Each (In a Pack of 5)
units
Single 3 → 5.5 V - 100dB 1 Bidirectional 1 mA Surface Mount VSSOP 10 3.1 x 3.1 x 0.95mm 0.95mm 3.1mm 5.5 V
RS Stock No. 817-6616
Mfr. Part No.INA286AID
HK$31.448
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. 197-7168
Mfr. Part No.INA168NA/250
HK$13.40
Each (On a Reel of 250)
units
Single 5 V - 100dB 1 Current - - SOT-23 5 - - - -
RS Stock No. 545-7625
Mfr. Part No.INA194AIDBVT
HK$27.406
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. 197-7170
Mfr. Part No.INA169NA/250
HK$14.892
Each (On a Reel of 250)
units
Single 5 V - 100dB 1 Current - - SOT-23 5 - - - -
RS Stock No. 162-8573
Mfr. Part No.INA219AIDCNR
HK$10.542
Each (On a Reel of 3000)
units
Single 6 V - 100dB 1 Digital 5 mA Surface Mount SOT-23 8 3 x 1.75 x 1.3mm 1.3mm 3mm 5.5 V
RS Stock No. 162-4671
Mfr. Part No.INA198AIDBVT
HK$15.162
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