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. 786-9727
Mfr. Part No.LT6106HS5#TRMPBF
HK$24.57
Each (In a Pack of 5)
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. 919-9881
Mfr. Part No.LT6106HS5#TRMPBF
HK$15.025
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. 822-5844
Mfr. Part No.LT1999IMS8-20#PBF
HK$50.925
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
RS Stock No. 919-9550
Mfr. Part No.LTC6101BIS5#TRMPBF
HK$22.634
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. 761-9623
Mfr. Part No.LTC6101BIS5#TRMPBF
HK$36.63
Each
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. 820-9393
Mfr. Part No.AD8417BRMZ
HK$26.944
Each (In a Pack of 5)
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. 423-472
Mfr. Part No.LTC6102CMS8#PBF
HK$38.95
Each
units
Single 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V - - 1 - 0.45 mA Surface Mount MSOP 8 3 x 3 x 0.86mm 0.86mm 3mm 60 V
RS Stock No. 709-7095
Mfr. Part No.AD8273ARZ
HK$38.95
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. 761-8897
Mfr. Part No.LT6106CS5#TRMPBF
HK$21.74
Each
units
Single 36 V - - 1 - 0.13 mA Surface Mount TSOT-23 5 2.9 x 1.75 x 0.9mm 0.9mm 2.9mm 36 V
RS Stock No. 919-9358
Mfr. Part No.LT6106CS5#TRMPBF
HK$13.403
Each (On a Reel of 500)
units
Single 36 V - - 1 - 0.13 mA Surface Mount TSOT-23 5 2.9 x 1.75 x 0.9mm 0.9mm 2.9mm 36 V
RS Stock No. 761-9614
Mfr. Part No.LTC6101BCS5#TRMPBF
HK$29.74
Each
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. 798-9903
Mfr. Part No.AD8418AWBRZ
HK$26.79
Each
units
Single 2.7 → 5.5 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. 851-6828
Mfr. Part No.LT6108IMS8-2#PBF
HK$32.362
Each (In a Pack of 5)
units
Single 2.7 → 60 V - 125dB 1 Open Drain 450 μA Surface Mount MSOP 8 3 x 3 x 0.86mm 0.86mm 3mm 60 V
RS Stock No. 884-6775
Mfr. Part No.LTC6102HMS8#PBF
HK$52.645
Each (In a Pack of 2)
units
Single 12 V - - 1 - 675 μA Surface Mount MSOP 8 3 x 3 x 0.86mm 0.86mm 3mm 60 V
RS Stock No. 786-9714
Mfr. Part No.LT6100CMS8#PBF
HK$25.586
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. 709-5636
Mfr. Part No.AD22057RZ
HK$122.16
Each
units
Single 5 V - 80dB 1 - - Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 36 V
RS Stock No. 820-9397
Mfr. Part No.AD8418WBRMZ
HK$25.63
Each (In a Pack of 5)
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. 796-8912
Mfr. Part No.AD8211YRJZ-R2
HK$25.368
Each (In a Pack of 5)
units
Single 5 V - 100dB 1 Buffered 2 mA Surface Mount SOT-23 5 3 x 1.7 x 1.3mm 1.3mm 3mm 5.5 V
RS Stock No. 835-3790
Mfr. Part No.AD8417WBRZ
HK$26.615
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. 851-6819
Mfr. Part No.LT6105CMS8#PBF
HK$26.082
Each (In a Pack of 5)
units
Single 2.85 → 36 V - 120dB 1 Unidirectional 350 μA Surface Mount MSOP 8 3 x 3 x 0.86mm 0.86mm 3mm 36 V