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. 426-308
Mfr. Part No.TSC101BILT
PHP71.508
Each (In a Pack of 5)
units
Single 12 V, 15 V, 18 V, 5 V, 9 V - 90dB 1 - 0.3 mA Surface Mount SOT-23 5 3 x 1.75 x 1.3mm 1.3mm 3mm 24 V
RS Stock No. 920-6311
Mfr. Part No.TSC101BILT
PHP35.203
Each (On a Reel of 3000)
units
Single 5 V, 9 V, 12 V, 15 V, 18 V - 90dB 1 - 0.3 mA Surface Mount SOT-23 5 3 x 1.75 x 1.3mm 1.3mm 3mm 24 V
RS Stock No. 166-0789
Mfr. Part No.TSC101CILT
PHP44.936
Each (On a Reel of 3000)
units
Single 5 V, 9 V, 12 V, 15 V, 18 V - 90dB 1 - 0.3 mA Surface Mount SOT-23 5 3 x 1.75 x 1.3mm 1.3mm 3mm 24 V
RS Stock No. 426-269
Mfr. Part No.TSC101CILT
PHP83.23
Each (In a Pack of 5)
units
Single 12 V, 15 V, 18 V, 5 V, 9 V - 90dB 1 - 0.3 mA Surface Mount SOT-23 5 3 x 1.75 x 1.3mm 1.3mm 3mm 24 V
RS Stock No. 860-7514
Mfr. Part No.CS30BL
PHP49.576
Each (In a Pack of 5)
units
Single 2.8 → 30 V - - 2 Single Ended - Surface Mount SOT-23 5 3 x 1.75 x 1.3mm 1.3mm 3mm -
RS Stock No. 920-6317
Mfr. Part No.TSC101AILT
PHP35.203
Each (On a Reel of 3000)
units
Single 5 V, 9 V, 12 V, 15 V, 18 V - 90dB 1 - 0.3 mA Surface Mount SOT-23 5 3 x 1.75 x 1.3mm 1.3mm 3mm 24 V
RS Stock No. 829-1544
Mfr. Part No.TSC1021BIYPT
PHP65.754
Each (In a Pack of 5)
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. 168-8817
Mfr. Part No.CS30BL
PHP35.617
Each (On a Reel of 3000)
units
Single 2.8 → 30 V - - 2 Single Ended - Surface Mount SOT-23 5 3 x 1.75 x 1.3mm 1.3mm 3mm -
RS Stock No. 860-7505
Mfr. Part No.CS30AL
PHP60.446
Each (In a Pack of 5)
units
Single 2.8 → 30 V - - 2 Single Ended - Surface Mount SOT-23 5 3 x 1.75 x 1.3mm 1.3mm 3mm -
RS Stock No. 829-1541
Mfr. Part No.TSC1021AIYPT
PHP43.552
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. 426-190
Mfr. Part No.TSC101AILT
PHP58.09
Each (In a Pack of 5)
units
Single 12 V, 15 V, 18 V, 5 V, 9 V - 90dB 1 - 0.3 mA Surface Mount SOT-23 5 3 x 1.75 x 1.3mm 1.3mm 3mm 24 V
RS Stock No. 795-8634
Mfr. Part No.TSC1031IPT
PHP134.838
Each (In a Pack of 5)
units
Dual, Single 2.9 → 70 V -2.1 → 65V 90dB 1 Buffered 480 μA Surface Mount TSSOP 8 4.5 x 3.1 x 1.05mm 1.05mm 4.5mm 5.5 V
RS Stock No. 795-9259
Mfr. Part No.TSC103IPT
PHP117.08
Each (In a Pack of 2)
units
Dual, Single 2.9 → 70 V -2.1 → 65V 90dB 1 Buffered 480 μA Surface Mount TSSOP 8 4.5 x 3.1 x 1.05mm 1.05mm 4.5mm 5.5 V
RS Stock No. 795-9176
Mfr. Part No.TSC102IPT
PHP88.20
Each (In a Pack of 2)
units
Single 2.8 → 30 V - 90dB 1 - 700 μA Surface Mount TSSOP 8 4.5 x 3.1 x 1.05mm 1.05mm 4.5mm 5.5 V
RS Stock No. 168-8818
Mfr. Part No.CS30CL
PHP35.617
Each (On a Reel of 3000)
units
Single 2.8 → 30 V - - 2 Single Ended - Surface Mount SOT-23 5 3 x 1.75 x 1.3mm 1.3mm 3mm -
RS Stock No. 168-7749
Mfr. Part No.TSC102IPT
PHP38.96
Each (On a Reel of 4000)
units
Single 2.8 → 30 V - 90dB 1 - 700 μA Surface Mount TSSOP 8 4.5 x 3.1 x 1.05mm 1.05mm 4.5mm 5.5 V
RS Stock No. 860-7517
Mfr. Part No.CS30CL
PHP49.452
Each (In a Pack of 5)
units
Single 2.8 → 30 V - - 2 Single Ended - Surface Mount SOT-23 5 3 x 1.75 x 1.3mm 1.3mm 3mm -
RS Stock No. 168-8815
Mfr. Part No.CS30AL
PHP35.617
Each (On a Reel of 3000)
units
Single 2.8 → 30 V - - 2 Single Ended - Surface Mount SOT-23 5 3 x 1.75 x 1.3mm 1.3mm 3mm -
RS Stock No. 165-5719
Mfr. Part No.TSC1021AIYPT
PHP44.761
Each (On a Reel of 4000)
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. 168-8082
Mfr. Part No.TSC1021BIYPT
PHP44.521
Each (On a Reel of 4000)
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