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. 168-7760
Mfr. Part No.TSC103IPT
$3.21
Each (On a Reel of 4000)
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
$2.34
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. 426-269
Mfr. Part No.TSC101CILT
$2.744
Each (In a Pack of 5)
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. 426-308
Mfr. Part No.TSC101BILT
$1.796
Each (In a Pack of 5)
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. 920-6311
Mfr. Part No.TSC101BILT
$1.326
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
$2.066
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. 860-7517
Mfr. Part No.CS30CL
$1.258
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. 168-8818
Mfr. Part No.CS30CL
$1.083
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. 920-6317
Mfr. Part No.TSC101AILT
$1.515
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. 426-190
Mfr. Part No.TSC101AILT
$2.156
Each (In a Pack of 5)
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. 165-5719
Mfr. Part No.TSC1021AIYPT
$1.203
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. 829-1541
Mfr. Part No.TSC1021AIYPT
$1.15
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. 795-9176
Mfr. Part No.TSC102IPT
$2.055
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. 168-8082
Mfr. Part No.TSC1021BIYPT
$1.354
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. 165-6638
Mfr. Part No.TSC1031IPT
$2.854
Each (On a Reel of 4000)
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. 829-1544
Mfr. Part No.TSC1021BIYPT
$1.584
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. 168-7749
Mfr. Part No.TSC102IPT
$2.401
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. 795-8634
Mfr. Part No.TSC1031IPT
$3.30
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. 860-7505
Mfr. Part No.CS30AL
$1.48
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. 860-7514
Mfr. Part No.CS30BL
$1.588
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 -