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. 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. 732-7891
Mfr. Part No.MAX4080TASA+
BrandMaxim
HK$22.55
Each
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. 811-5800
Mfr. Part No.LMP8645MKE/NOPB
HK$18.124
Each (In a Pack of 5)
units
Dual - ±12 V, ±2.7 V, ±5 V 95dB 1 Buffered 710 μA Surface Mount SOT-23 6 3.05 x 1.75 x 1mm 1mm 3.05mm 12 V
RS Stock No. 738-5131
Mfr. Part No.ZXCT1022E5TA
HK$10.606
Each (In a Pack of 5)
units
- - - - - - - - - - - - - -
RS Stock No. 786-1322
Mfr. Part No.MAX9611AUB+
BrandMaxim
HK$26.165
Each (In a Pack of 2)
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. 660-4841
Mfr. Part No.INA170EA/250
HK$25.45
Each
units
Single 3 V, 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V - 100dB 1 - - Surface Mount MSOP 8 3 x 3 x 0.97mm 0.97mm 3mm 40 V
RS Stock No. 163-0171
Mfr. Part No.NCS199A1SQT2G
HK$4.318
Each (On a Reel of 3000)
units
Single 2.7 → 26 V - 97dB 1 Rail to Rail 5 mA Surface Mount SC-70 6 2.2 x 1.35 x 1mm 1mm 2.2mm 26 V
RS Stock No. 162-8172
Mfr. Part No.INA3221AIRGVT
HK$36.164
Each (On a Reel of 250)
units
Single 2.7 → 5.5 V - 110dB 1 Open Drain 450 μA Surface Mount VQFN 16 4.15 x 4.15 x 0.95mm 0.95mm 4.15mm 5.5 V
RS Stock No. 165-9687
Mfr. Part No.MAX9920ASA+
BrandMaxim
HK$18.471
Each (In a Tube of 100)
units
Single 4.5 → 5.5 V - 72dB 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. 122-0307
Mfr. Part No.ZXCT1022E5TA
HK$4.959
Each (On a Reel of 3000)
units
- - - - - - - - - - - - - -
RS Stock No. 921-3006
Mfr. Part No.INA200AIDGKR
HK$12.826
Each (On a Reel of 2500)
units
Single 12 V - 80dB 1 Analogue 5 mA Surface Mount VSSOP 8 3.1 x 3.1 x 0.95mm 0.95mm 3.1mm 18 V
New
RS Stock No. 185-8098
Mfr. Part No.NCV213RSQT2G
HK$3.047
Each (On a Reel of 3000)
units
Single 2.2 → 26 V - 100dB 1 Rail to Rail 60 μA Surface Mount SC-70 6 2.2 x 1.35 x 1mm 1mm 2.2mm 26 V
RS Stock No. 920-6311
Mfr. Part No.TSC101BILT
HK$6.082
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. 860-7505
Mfr. Part No.CS30AL
HK$9.072
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 -
New
RS Stock No. 178-4554
Mfr. Part No.NCS199A1RSQT2G
HK$4.319
Each (In a Pack of 50)
units
Single 5 V - 100dB 1 Rail to Rail 80 μA Surface Mount SC-70 6 2.2 x 1.35 x 1mm 1mm 2.2mm 26 V
RS Stock No. 783-3557
Mfr. Part No.MAX4173FEUT+T
BrandMaxim
HK$18.88
Each (In a Pack of 2)
units
Single 3 → 28 V - 90dB 1 - 1 mA Surface Mount SOT-23 6 3 x 1.75 x 1.3mm 1.3mm 3mm 28 V
New
RS Stock No. 189-0235
Mfr. Part No.NCV211RSQT2G
HK$3.016
Each (On a Reel of 3000)
units
Single 5 V - 105dB 1 Rail to Rail 80 μA Surface Mount SC-70 6 2.2 x 1.35 x 1mm 1mm 2.2mm 26 V
RS Stock No. 155-7545
Mfr. Part No.LTC4151IDD#PBF
HK$42.499
Each (In a Tube of 141)
units
Single 4.5 → 5.5 V - - 1 Open Collector 1.7 mA Surface Mount DFN 10 3 x 3 x 0.7mm 0.7mm 3mm 80 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. 146-1075
Mfr. Part No.MAX4173TESA+
BrandMaxim
HK$15.481
Each (In a Tube of 100)
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
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