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. 423-478
Mfr. Part No.LTC6104CMS8#PBF
PHP202.73
Each
units
Single 12 V, 15 V, 18 V, 24 V, 28 V, 5 V, 9 V - - 1 - 1.04 mA Surface Mount MSOP 8 3 x 3 x 0.86mm 0.86mm 3mm 60 V
RS Stock No. 145-7057
Mfr. Part No.LTC6104CMS8#PBF
PHP120.00
Each (In a Tube of 50)
units
Single 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V - - 1 - 1.04 mA Surface Mount MSOP 8 3 x 3 x 0.86mm 0.86mm 3mm 60 V
RS Stock No. 506-0417
Mfr. Part No.LT1787HVCS8#PBF
PHP344.31
Each
units
Single 3 V, 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V - - 1 - 0.12 mA Surface Mount SOIC 8 5 x 3.99 x 1.48mm 1.48mm 5mm 60 V
RS Stock No. 917-3520
Mfr. Part No.LT1787HVCS8#PBF
PHP451.68
Each (In a Tube of 100)
units
Single 3 V, 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V - - 1 - 0.12 mA Surface Mount SOIC 8 5 x 3.99 x 1.48mm 1.48mm 5mm 60 V
RS Stock No. 145-7690
Mfr. Part No.LT1787IMS8#PBF
PHP229.073
Each (In a Tube of 50)
units
Single 36 V - - 1 Bidirectional, Unidirectional 0.02 mA Surface Mount MSOP 8 3 x 3 x 0.86mm 0.86mm 3mm 36 V
RS Stock No. 835-3790
Mfr. Part No.AD8417WBRZ
PHP154.225
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. 145-7220
Mfr. Part No.AD8417BRMZ
PHP117.08
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. 145-6632
Mfr. Part No.AD8418WBRMZ
PHP104.48
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. 160-9876
Mfr. Part No.AD8418ABRMZ-RL
PHP86.921
Each (On a Reel of 3000)
units
Single 5 V - 90dB 1 Buffered 4.1 mA Surface Mount MSOP 8 3.2 x 3.2 x 0.95mm 0.95mm 3.2mm 5.5 V
RS Stock No. 177-7160
Mfr. Part No.LT6100IMS8#PBF
PHP217.08
Each (In a Tube of 50)
units
Single 2.7 → 36 V - 100dB 1 Differential 145 μA Surface Mount MSOP 8 3 x 3 x 0.86mm 0.86mm 3mm 36 V
RS Stock No. 919-9556
Mfr. Part No.LTC6101HVAHMS8#PBF
PHP368.602
Each (In a Tube of 50)
units
Single 100 V - - 1 Unidirectional 0.72 mA Surface Mount MSOP 8 3 x 3 x 0.86mm 0.86mm 3mm 100 V
RS Stock No. 183-1929
Mfr. Part No.AD8418ABRMZ
PHP152.40
Each (In a Pack of 5)
units
Single 2.7 → 5.5 V - 90dB 1 Buffered - Surface Mount MSOP 8 3.2 x 3.2 x 0.95mm 0.95mm 3.2mm 5.5 V
RS Stock No. 155-7545
Mfr. Part No.LTC4151IDD#PBF
PHP220.487
Each (In a Tube of 141)
units
Single 4.5 → 5.5 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. 822-5743
Mfr. Part No.LTC4151CDD#PBF
PHP337.75
Each
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. 709-7095
Mfr. Part No.AD8273ARZ
PHP244.77
Each
units
Dual - ±12 V, ±15 V, ±3 V, ±5 V, ±9 V 77dB 2 - 5 mA Surface Mount SOIC N 14 8.75 x 4 x 1.5mm 1.5mm 8.75mm ±18 V
RS Stock No. 761-8894
Mfr. Part No.LT6105IMS8#PBF
PHP142.61
Each
units
Single 36 V - 90dB 1 Differential 0.35 mA Surface Mount MSOP 8 3 x 3 x 0.86mm 0.86mm 3mm 36 V
RS Stock No. 819-7294
Mfr. Part No.AD8213YRMZ
PHP271.505
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. 919-9881
Mfr. Part No.LT6106HS5#TRMPBF
PHP153.743
Each (On a Reel of 500)
units
Single 2.7 → 36 V - - 1 - 115 μA Surface Mount TSOT-23 5 2.9 x 1.75 x 0.9mm 0.9mm 2.9mm 36 V
RS Stock No. 697-7224
Mfr. Part No.AD8210WYRZ
PHP263.55
Each
units
Single 5 V - - 1 - - Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 5.5 V
RS Stock No. 822-5844
Mfr. Part No.LT1999IMS8-20#PBF
PHP278.46
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