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. 824-5475
Mfr. Part No.ZXCT1020E5TA
$1.165
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. 122-3297
Mfr. Part No.ZXCT1020E5TA
$0.984
Each (On a Reel of 3000)
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. 738-5285
Mfr. Part No.ZXCT1110W5-7
$2.428
Each (In a Pack of 5)
units
- - - - - - - - - - - - - -
RS Stock No. 122-0315
Mfr. Part No.ZXCT1082E5TA
$1.121
Each (On a Reel of 3000)
units
- 2.7 to 60 V - 80dB - - - - - - - - - -
RS Stock No. 738-5272
Mfr. Part No.ZXCT1107SA-7
$1.46
Each (In a Pack of 5)
units
- - - - - - - - - - - - - -
RS Stock No. 922-7617
Mfr. Part No.ZXCT1009FTA
$0.978
Each (On a Reel of 3000)
units
- 2.5 → 20 V - - - - - Surface Mount SOT-23 3 3.05 x 1.4 x 1mm 1mm 3.05mm -
RS Stock No. 738-5279
Mfr. Part No.ZXCT1087E5TA
$1.574
Each (In a Pack of 5)
units
- - - - - - - - - - - - - -
RS Stock No. 154-920
Mfr. Part No.ZXCT1009FTA
$2.206
Each (In a Pack of 5)
units
- 2.5 → 20 V - - - - - Surface Mount SOT-23 3 3.05 x 1.4 x 1mm 1mm 3.05mm -
RS Stock No. 922-8241
Mfr. Part No.ZXCT1087E5TA
$1.172
Each (On a Reel of 3000)
units
- - - - - - - - - - - - - -
RS Stock No. 738-5131
Mfr. Part No.ZXCT1022E5TA
$1.378
Each (In a Pack of 5)
units
- - - - - - - - - - - - - -
RS Stock No. 738-5263
Mfr. Part No.ZXCT1084E5TA
$2.128
Each (On a Tape of 5)
units
- - - - - - - - - - - - - -
RS Stock No. 738-5250
Mfr. Part No.ZXCT1082E5TA
$2.24
Each (In a Pack of 5)
units
Single 2.7 → 60 V - 80dB - - - - - - - - - -
RS Stock No. 922-8232
Mfr. Part No.ZXCT1109SA-7
$0.785
Each (On a Reel of 3000)
units
- - - - - - - - - - - - - -
RS Stock No. 922-8238
Mfr. Part No.ZXCT1107SA-7
$0.812
Each (On a Reel of 3000)
units
- - - - - - - - - - - - - -
RS Stock No. 738-5276
Mfr. Part No.ZXCT1109SA-7
$1.294
Each (In a Pack of 5)
units
- - - - - - - - - - - - - -
RS Stock No. 922-8235
Mfr. Part No.ZXCT1084E5TA
$1.287
Each (On a Reel of 3000)
units
- - - - - - - - - - - - - -
RS Stock No. 122-0307
Mfr. Part No.ZXCT1022E5TA
$1.064
Each (On a Reel of 3000)
units
- - - - - - - - - - - - - -
RS Stock No. 122-0319
Mfr. Part No.ZXCT1110W5-7
$0.721
Each (On a Reel of 3000)
units
- - - - - - - - - - - - - -