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. 192-1935
Mfr. Part No.MAX9920ASA+
HK$12.278
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. 709-9117
Mfr. Part No.INA214AIDCKT
HK$12.75
Each
units
Single 3 V, 5 V, 9 V, 12 V, 15 V, 18 V, 24 V - 105dB 1 - - Surface Mount SC-70 6 2 x 1.25 x 0.9mm 0.9mm 2mm 26 V
RS Stock No. 145-6633
Mfr. Part No.AD8213WYRMZ
HK$39.19
Each (In a Tube of 50)
units
Single 5 V - 100dB 2 Buffered 4.5 mA Surface Mount MSOP 10 3.1 x 3.1 x 0.95mm 0.95mm 3.1mm 5.5 V
RS Stock No. 165-9497
Mfr. Part No.MAX4373TESA+
HK$17.984
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. 190-4308
Mfr. Part No.MAX4081TASA+
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. 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. 170-8125
Mfr. Part No.ISL28023FR12Z-T7A
BrandIntersil
HK$37.65
Each (On a Reel of 250)
units
Single 3.3 V - 136dB 2 Open Drain 1.24 mA Surface Mount QFN 24 4 x 4 x 0.85mm 0.85mm 4mm 5.5 V
RS Stock No. 795-9176
Mfr. Part No.TSC102IPT
HK$10.93
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. 738-5250
Mfr. Part No.ZXCT1082E5TA
HK$12.66
Each (In a Pack of 5)
units
Single 2.7 → 60 V - 80dB - - - - - - - - - -
RS Stock No. 190-6445
Mfr. Part No.MAX9938TEUK+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. 177-7171
Mfr. Part No.LTC6102IMS8#PBF
HK$27.133
Each (In a Tube of 50)
units
Single 5 → 100 V - - 1 Rail to Rail 650 μA Surface Mount MSOP 8 3 x 3 x 0.9984mm 0.998mm 3mm 100 V
RS Stock No. 178-4576
Mfr. Part No.NCS213RSQT2G
HK$5.81
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. 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. 865-5699
Mfr. Part No.IR2175PBF
BrandInfineon
HK$30.85
Each (In a Tube of 2)
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. 185-8099
Mfr. Part No.NCV214RSQT2G
HK$3.047
Each (On a Reel of 3000)
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. 817-6534
Mfr. Part No.INA199A2DCKT
HK$7.252
Each (In a Pack of 5)
units
Single 2.7 → 26 V - 100dB 1 Bidirectional 100 μA Surface Mount SC-70 6 2.15 x 1.4 x 1mm 1mm 2.15mm 26 V
RS Stock No. 709-7095
Mfr. Part No.AD8273ARZ
HK$35.94
Each
units
Dual - ±12 V, ±15 V, ±3 V, ±5 V, ±9 V 77dB 2 - 5 mA Surface Mount SOIC N 14 8.75 x 4 x 1.5mm 1.5mm 8.75mm ±18 V
RS Stock No. 919-9556
Mfr. Part No.LTC6101HVAHMS8#PBF
HK$32.431
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. 190-6392
Mfr. Part No.MAX4080SASA+T
HK$16.83
Each (In a Pack of 5)
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. 884-6775
Mfr. Part No.LTC6102HMS8#PBF
HK$49.335
Each (In a Pack of 2)
units
Single 12 V - - 1 - 675 μA Surface Mount MSOP 8 3 x 3 x 0.86mm 0.86mm 3mm 60 V
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