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. 122-3297
Mfr. Part No.ZXCT1020E5TA
HK$4.88
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. 160-9875
Mfr. Part No.AD8417WBRZ
HK$18.83
Each (In a Tube of 98)
units
Single 5 V - 90dB 1 Buffered 4.1 mA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 5.5 V
RS Stock No. 190-4301
Mfr. Part No.MAX4080SASA+T
HK$12.558
Each (On a Reel of 2500)
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. 121-6660
Mfr. Part No.AD8273ARZ
HK$27.55
Each (In a Tube of 56)
units
- - - - - - - - - - - - - -
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. 189-7273
Mfr. Part No.MAX4070AUA+
HK$17.235
Each (In a Tube of 50)
units
Single 2.7 → 24 V - 100dB 1 Rail to Rail 0.25 mA Surface Mount μMAX 8 3.05 x 3.05 x 0.95mm 0.95mm 3.05mm 24 V
RS Stock No. 730-0552
Mfr. Part No.INA216A4YFFT
HK$10.01
Each (In a Pack of 5)
units
Single 1.8 → 5.5 V - 90dB 1 Rail to Rail 0.025 mA Surface Mount DSBGA 4 0.79 x 0.79 x 0.325mm 0.325mm 0.79mm 5.5 V
New
RS Stock No. 197-7169
Mfr. Part No.INA168NA/250
HK$19.794
Each (In a Pack of 5)
units
Single 5 V - 100dB 1 Current - - SOT-23 5 - - - -
RS Stock No. 185-8979
Mfr. Part No.NCV213RSQT2G
HK$8.199
Each (In a Pack of 9)
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. 165-9191
Mfr. Part No.MAX4080TAUA+
HK$16.305
Each (In a Tube of 50)
units
Single 4.5 → 76 V - 100dB 1 Rail to Rail 0.19 mA Surface Mount μMAX 8 3.1 x 3.1 x 0.95mm 0.95mm 3.1mm 76 V
RS Stock No. 183-1761
Mfr. Part No.AD8417WHRMZ
HK$24.744
Each (In a Tube of 50)
units
Single 2.7 → 5.5 V - 90dB 1 Buffered - Surface Mount MSOP 8 3.2 x 3.2 x 0.95mm 0.95mm 3.2mm 5.5 V
RS Stock No. 192-2361
Mfr. Part No.MAX9920ASA+
HK$16.60
Each (In a Pack of 5)
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. 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. 185-8085
Mfr. Part No.NCS199A3RSQT2G
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. 917-3435
Mfr. Part No.LTC6102CMS8#PBF
HK$23.526
Each (In a Tube of 50)
units
Single 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V - - 1 - 0.45 mA Surface Mount MSOP 8 3 x 3 x 0.86mm 0.86mm 3mm 60 V
RS Stock No. 412-456
Mfr. Part No.AD8210YRZ
HK$39.11
Each
units
Single 5 V - 120 1 Bidirectional - Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 5.5 V
RS Stock No. 190-4316
Mfr. Part No.MAX4173TEUT+T
HK$15.512
Each (On a Reel of 2500)
units
Single 3 → 28 V - 90 (Typ.)dB 1 Voltage 1 mA Surface Mount SOT-23 6 3 x 1.75 x 1.3mm 1.3mm 3mm 28 V
RS Stock No. 163-0187
Mfr. Part No.NCS210SQT2G
HK$5.78
Each (On a Reel of 3000)
units
Single 2.7 → 26 V - 103dB 1 Rail to Rail 5 mA Surface Mount SC-70 6 2.2 x 1.35 x 1mm 1mm 2.2mm 26 V
New
RS Stock No. 197-7170
Mfr. Part No.INA169NA/250
HK$15.094
Each (On a Reel of 250)
units
Single 5 V - 100dB 1 Current - - SOT-23 5 - - - -
RS Stock No. 742-2889
Mfr. Part No.INA226AIDGST
HK$29.77
Each
units
- - - - - - - Surface Mount MSOP 10 3.1 x 3.1 x 0.95mm 0.95mm 3.1mm -
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