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. 160-9875
Mfr. Part No.AD8417WBRZ
$3.36
Each (In a Tube of 98)
units
Single 5 V - 90dB 1 Buffered 4.1 mA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 5.5 V
RS Stock No. 145-6049
Mfr. Part No.LT6100CMS8#PBF
$2.919
Each (In a Tube of 50)
units
Single 2.7 → 36 V - 100dB 1 Differential 130 μA Surface Mount MSOP 8 3 x 3 x 0.86mm 0.86mm 3mm 36 V
RS Stock No. 738-5279
Mfr. Part No.ZXCT1087E5TA
$2.26
Each (In a Pack of 5)
units
- - - - - - - - - - - - - -
RS Stock No. 738-5263
Mfr. Part No.ZXCT1084E5TA
$2.32
Each (On a Tape of 5)
units
- - - - - - - - - - - - - -
RS Stock No. 921-5087
Mfr. Part No.INA219AIDCNT
$2.69
Each (On a Reel of 250)
units
- - - - - - - Surface Mount SOT-23 8 2.9 x 1.63 x 1.1mm 1.1mm 2.9mm -
RS Stock No. 835-3790
Mfr. Part No.AD8417WBRZ
$4.40
Each (In a Pack of 2)
units
Single 5 V - 90dB 1 Buffered 4.1 mA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 5.5 V
RS Stock No. 761-9626
Mfr. Part No.LTC6101HVACS5#TRMPBF
$7.10
Each
units
Single 5 → 100 V 5 → 100V - 1 Unidirectional 0.64 mA Surface Mount TSOT-23 5 2.9 x 1.75 x 0.9mm 0.9mm 2.9mm 100 V
RS Stock No. 461-6558
Mfr. Part No.INA139NA/250
$2.48
Each
units
Single 12 V, 15 V, 18 V, 24 V, 28 V, 3 V, 5 V, 9 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. 786-9714
Mfr. Part No.LT6100CMS8#PBF
$4.65
Each (In a Pack of 5)
units
Single 2.7 → 36 V - 100dB 1 Differential 130 μA Surface Mount MSOP 8 3 x 3 x 0.86mm 0.86mm 3mm 36 V
RS Stock No. 919-9569
Mfr. Part No.LTC6101HVACS5#TRMPBF
$4.00
Each (On a Reel of 500)
units
Single 5 → 100 V 5 → 100V - 1 Unidirectional 0.64 mA Surface Mount TSOT-23 5 2.9 x 1.75 x 0.9mm 0.9mm 2.9mm 100 V
RS Stock No. 121-6917
Mfr. Part No.AD8418WBRZ
$3.04
Each (In a Tube of 98)
units
Single 5 V - 90dB 1 Bidirectional 130 μA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 5.5 V
RS Stock No. 169-0202
Mfr. Part No.SI8920AC-IP
$6.44
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. 921-2940
Mfr. Part No.INA282AID
$4.80
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. 121-6660
Mfr. Part No.AD8273ARZ
$4.92
Each (In a Tube of 56)
units
- - - - - - - - - - - - - -
RS Stock No. 121-8924
Mfr. Part No.INA197AIDBVT
$2.64
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. 921-5961
Mfr. Part No.ISL28006FH50Z-T7A
$5.36
Each (In a Pack of 5)
units
Single 2.7 → 28 V - 105dB 1 - 50 μA Surface Mount SOT-23 5 2.9 x 1.6 x 1.14mm 1.14mm 2.9mm 28 V
RS Stock No. 660-4841
Mfr. Part No.INA170EA/250
$5.39
Each
units
Single 3 V, 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V - 100dB 1 - - Surface Mount MSOP 8 3 x 3 x 0.97mm 0.97mm 3mm 40 V
RS Stock No. 163-0187
Mfr. Part No.NCS210SQT2G
$1.342
Each (On a Reel of 3000)
units
Single 2.7 → 26 V - 103dB 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. 168-4352
Mfr. Part No.LTC4151CDD#PBF
$6.476
Each (In a Tube of 121)
units
Single 7 → 80 V - - 1 Open Collector 1.7 mA Surface Mount DFN 10 3 x 3 x 0.7mm 0.7mm 3mm 80 V
RS Stock No. 169-0204
Mfr. Part No.SI8920BC-IP
$5.38
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
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