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. 189-8885
Mfr. Part No.MAX4372TEUK+T
HK$16.922
Each (In a Pack of 5)
units
Single 2.7 → 28 V - - 1 Differential 0.06 mA Surface Mount SOT-23 5 3 x 1.75 x 1.3mm 1.3mm 3mm 28 V
RS Stock No. 190-6329
Mfr. Part No.MAX4373FEUA+T
HK$20.82
Each (In a Pack of 5)
units
Single 2.7 → 28 V - 85 (Typ.)dB 1 Voltage 100 μA Surface Mount μMAX 8 3.1 x 3.1 x 0.95mm 0.95mm 3.1mm 28 V
RS Stock No. 185-8084
Mfr. Part No.NCS199A2RSQT2G
HK$2.689
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. 190-4315
Mfr. Part No.MAX4173HESA+
HK$11.64
Each (In a Tube of 100)
units
Single 3 → 28 V - 90 (Typ.)dB 1 Voltage 1 mA Surface Mount SO 8 5 x 4 x 1.5mm 1.5mm 5mm 28 V
RS Stock No. 920-6311
Mfr. Part No.TSC101BILT
HK$4.408
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. 191-3435
Mfr. Part No.MAX9938HEUK+T
HK$10.41
Each (In a Pack of 5)
units
Single 1.6 → 28 V - 94dB 1 Voltage 2.5 μA Surface Mount SOT-23 5 3 x 1.75 x 1.3mm 1.3mm 3mm 28 V
RS Stock No. 168-7760
Mfr. Part No.TSC103IPT
HK$8.704
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. 165-5474
Mfr. Part No.IR2175PBF
BrandInfineon
HK$25.41
Each (In a Tube of 50)
units
Single 5 V - - 1 Open Drain 0.5 mA Through Hole PDIP 8 5 x 4 x 1.75mm 1.75mm 5mm 5 V
RS Stock No. 190-4304
Mfr. Part No.MAX4081FASA+
HK$17.605
Each (In a Tube of 100)
units
Single 4.5 → 76 V - 100dB 1 Voltage 190 μA Surface Mount SO 8 5 x 4 x 1.5mm 1.5mm 5mm 76 V
RS Stock No. 121-8921
Mfr. Part No.INA194AIDBVT
HK$14.80
Each (On a Reel of 250)
units
Single 3 V, 5 V, 9 V, 12 V, 15 V - 80dB 1 - - Surface Mount SOT-23 5 2.9 x 1.6 x 1.15mm 1.15mm 2.9mm 18 V
RS Stock No. 190-4389
Mfr. Part No.MAX9938FEUK+T
HK$6.845
Each (On a Reel of 2500)
units
Single 1.6 → 28 V - 94dB 1 Voltage 2.5 μA Surface Mount SOT-23 5 3 x 1.75 x 1.3mm 1.3mm 3mm 28 V
RS Stock No. 709-8855
Mfr. Part No.INA219AIDCNT
HK$18.71
Each
units
- - - - - - - Surface Mount SOT-23 8 2.9 x 1.63 x 1.1mm 1.1mm 2.9mm -
RS Stock No. 920-9833
Mfr. Part No.NCS199A1SQT2G
HK$5.99
Each (In a Pack of 10)
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. 190-4328
Mfr. Part No.MAX4373TEUA+
HK$24.67
Each (In a Tube of 50)
units
Single 2.7 → 28 V - 85 (Typ.)dB 1 Voltage 100 μA Surface Mount μMAX 8 3.1 x 3.1 x 0.95mm 0.95mm 3.1mm 28 V
RS Stock No. 190-6688
Mfr. Part No.MAX9934TAUA+
HK$17.526
Each (In a Pack of 5)
units
Single 2.5 → 3.6 V - 98dB 1 Current 230 μA Surface Mount μMAX 8 3.1 x 3.1 x 0.95mm 0.95mm 3.1mm 3.6 V
RS Stock No. 190-6433
Mfr. Part No.MAX9938FEUK+T
HK$10.23
Each (In a Pack of 5)
units
Single 1.6 → 28 V - 94dB 1 Voltage 2.5 μA Surface Mount SOT-23 5 3 x 1.75 x 1.3mm 1.3mm 3mm 28 V
RS Stock No. 545-7669
Mfr. Part No.INA198AIDBVT
HK$21.73
Each (In a Pack of 5)
units
Single 3 V, 5 V, 9 V, 12 V, 15 V - 80dB 1 - - Surface Mount SOT-23 5 2.9 x 1.6 x 1.15mm 1.15mm 2.9mm 18 V
RS Stock No. 160-8581
Mfr. Part No.AD8418BRMZ
HK$17.20
Each (In a Tube of 50)
units
Single 5 V - 90dB 1 Bidirectional 130 μA Surface Mount MSOP 8 3.2 x 3.2 x 0.95mm 0.95mm 3.2mm 5.5 V
RS Stock No. 185-8909
Mfr. Part No.NCV210RSQT2G
HK$8.199
Each (In a Pack of 9)
units
Single 2.2 → 26 V - 105dB 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. 168-8818
Mfr. Part No.CS30CL
HK$4.285
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 -