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. 169-5577
Mfr. Part No.INA206AID
HK$21.026
Each (In a Tube of 50)
units
- - - - - - - Surface Mount SOIC 14 8.65 x 3.91 x 1.58mm 1.58mm 8.65mm -
RS Stock No. 661-3407
Mfr. Part No.XTR111AIDGQT
HK$14.66
Each
units
- - - - - - - Surface Mount HTSSOP 10 3 x 3 x 1.02mm 1.02mm 3mm -
RS Stock No. 738-5285
Mfr. Part No.ZXCT1110W5-7
HK$6.868
Each (In a Pack of 5)
units
- - - - - - - - - - - - - -
RS Stock No. 122-0319
Mfr. Part No.ZXCT1110W5-7
HK$4.166
Each (On a Reel of 3000)
units
- - - - - - - - - - - - - -
RS Stock No. 145-1310
Mfr. Part No.LT1999IMS8-20#PBF
HK$29.898
Each (In a Tube of 50)
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. 155-5368
Mfr. Part No.LT2940IMS#PBF
HK$34.208
Each (In a Tube of 37)
units
Single 80 V - - 1 Bidirectional 5 mA Surface Mount MSOP 12 4.039 x 3 x 0.86mm 0.86mm 4.04mm 80 V
RS Stock No. 103-9967
Mfr. Part No.MAX4080TASA+
BrandMaxim
HK$17.922
Each (In a Tube of 100)
units
Single 4.5 → 76 V - 100dB 1 Rail to Rail 0.19 mA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 76 V
RS Stock No. 168-8082
Mfr. Part No.TSC1021BIYPT
HK$7.262
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. 162-8168
Mfr. Part No.INA216A2YFFT
HK$6.759
Each (On a Reel of 250)
units
Single 1.8 → 5.5 V - 90dB 1 Unidirectional 100 μA Surface Mount DSBGA 4 0.79 x 0.79 x 0.325mm 0.325mm 0.79mm 5.5 V
RS Stock No. 919-9556
Mfr. Part No.LTC6101HVAHMS8#PBF
HK$29.894
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. 178-7428
Mfr. Part No.IR2172SPBF
BrandInfineon
HK$49.54
Each (In a Tube of 95)
units
Single 5 V - - 1 Open Drain 2 mA Surface Mount SOIC 8 5 x 4 x 1.75mm 1.75mm 5mm 5 V
RS Stock No. 786-1108
Mfr. Part No.MAX4173TESA+
BrandMaxim
HK$15.86
Each (In a Pack of 5)
units
Single 3 → 28 V - 90dB 1 Differential 1 mA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 28 V
RS Stock No. 165-9409
Mfr. Part No.MAX9611AUB+
BrandMaxim
HK$31.797
Each (In a Tube of 50)
units
Single 2.7 → 5.5 V - 106dB 1 Rail to Rail 2.6 mA Surface Mount μMAX 10 3.05 x 3.05 x 0.95mm 0.95mm 3.05mm 6 V
RS Stock No. 860-7514
Mfr. Part No.CS30BL
HK$8.40
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. 183-1949
Mfr. Part No.AD8210YRZ-REEL7
HK$41.04
Each (In a Pack of 2)
units
Single 5 V - 100dB 1 Single Ended - Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 5.5 V
RS Stock No. 786-1363
Mfr. Part No.MAX9918ASA+
BrandMaxim
HK$19.882
Each (In a Pack of 5)
units
Single 4.5 → 5.5 V - 96dB 1 Rail to Rail 2.2 mA Surface Mount SOIC 8 4.98 x 3.99 x 1.58mm 1.58mm 4.98mm 5.5 V
RS Stock No. 795-9259
Mfr. Part No.TSC103IPT
HK$25.545
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. 165-9496
Mfr. Part No.MAX4373FESA+
BrandMaxim
HK$30.913
Each (In a Tube of 100)
units
Single 2.7 → 28 V - 85dB 1 Differential 100 μA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 28 V
RS Stock No. 133-0174
Mfr. Part No.INA250A3PW
HK$39.31
Each (In a Pack of 2)
units
Single - - 106dB 1 Analogue, Bidirectional ±15 A Surface Mount TSSOP 16 5.1 x 4.5 x 1.05mm 1.05mm 5.1mm 36 V
RS Stock No. 919-9358
Mfr. Part No.LT6106CS5#TRMPBF
HK$11.655
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
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