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. 145-6632
Mfr. Part No.AD8418WBRMZ
$3.04
Each (In a Tube of 50)
units
Single 5 V - 90dB 1 Bidirectional 130 μA Surface Mount MSOP 8 3.2 x 3.2 x 0.95mm 0.95mm 3.2mm 5.5 V
RS Stock No. 824-5475
Mfr. Part No.ZXCT1020E5TA
$1.62
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. 819-7294
Mfr. Part No.AD8213YRMZ
$7.75
Each (In a Pack of 2)
units
Single 5 V - 100dB 2 Buffered 3.7 mA Surface Mount MSOP 10 3.1 x 3.1 x 0.95mm 0.95mm 3.1mm 5.5 V
RS Stock No. 823-0079
Mfr. Part No.LTC6102IMS8#PBF
$7.79
Each (In a Pack of 2)
units
Single 5 → 100 V - - 1 Rail to Rail 650 μA Surface Mount MSOP 8 3 x 3 x 0.9984mm 0.998mm 3mm 100 V
RS Stock No. 920-9833
Mfr. Part No.NCS199A1SQT2G
$1.11
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. 764-8744
Mfr. Part No.AD8218BRMZ
$4.05
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. 162-8163
Mfr. Part No.INA199A2DCKT
$0.832
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. 829-1541
Mfr. Part No.TSC1021AIYPT
$1.96
Each (In a Pack of 10)
units
Single - - 90dB 2 Analogue 450 μA Surface Mount TSSOP 8 4.5 x 3.1 x 1.05mm 1.05mm 4.5mm 5.5 V dc
RS Stock No. 709-4529
Mfr. Part No.INA210AIDCKT
$2.28
Each
units
Single 12 V, 15 V, 18 V, 24 V, 3 V, 5 V, 9 V - 105dB 1 - - Surface Mount SC-70 6 2 x 1.25 x 0.9mm 0.9mm 2mm 26 V
RS Stock No. 820-9797
Mfr. Part No.AD8418WBRZ
$4.11
Each (In a Pack of 7)
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. 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. 738-5263
Mfr. Part No.ZXCT1084E5TA
$2.32
Each (On a Tape of 5)
units
- - - - - - - - - - - - - -
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. 100-3849
Mfr. Part No.INA139NA/250
$2.02
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. 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. 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. 922-8241
Mfr. Part No.ZXCT1087E5TA
$1.03
Each (On a Reel of 3000)
units
- - - - - - - - - - - - - -
RS Stock No. 738-5279
Mfr. Part No.ZXCT1087E5TA
$2.26
Each (In a Pack of 5)
units
- - - - - - - - - - - - - -
RS Stock No. 919-9550
Mfr. Part No.LTC6101BIS5#TRMPBF
$3.649
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. 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
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