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. 121-9269
Mfr. Part No.INA219BIDCNT
HK$13.823
Each (On a Reel of 250)
units
- - - - - - - Surface Mount SOT-23 8 3 x 1.75 x 1.3mm 1.3mm 3mm -
RS Stock No. 545-7603
Mfr. Part No.INA193AIDBVT
HK$25.472
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. 922-8241
Mfr. Part No.ZXCT1087E5TA
HK$5.655
Each (On a Reel of 3000)
units
- - - - - - - - - - - - - -
RS Stock No. 461-6558
Mfr. Part No.INA139NA/250
HK$15.61
Each
units
Single 3 V, 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V - 100dB 1 - - Surface Mount SOT-23 5 2.9 x 1.6 x 1.15mm 1.15mm 2.9mm 40 V
RS Stock No. 738-5279
Mfr. Part No.ZXCT1087E5TA
HK$13.226
Each (In a Pack of 5)
units
- - - - - - - - - - - - - -
RS Stock No. 168-4361
Mfr. Part No.INA213AIDCKR
HK$4.379
Each (On a Reel of 3000)
units
Single 5 V - 105dB 1 Analogue 5 mA Surface Mount SC-70 6 2.15 x 1.4 x 1mm 1mm 2.15mm 26 V
RS Stock No. 100-3849
Mfr. Part No.INA139NA/250
HK$10.65
Each (On a Reel of 250)
units
Single 3 V, 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V - 100dB 1 - - Surface Mount SOT-23 5 2.9 x 1.6 x 1.15mm 1.15mm 2.9mm 40 V
RS Stock No. 122-0319
Mfr. Part No.ZXCT1110W5-7
HK$3.574
Each (On a Reel of 3000)
units
- - - - - - - - - - - - - -
RS Stock No. 145-1310
Mfr. Part No.LT1999IMS8-20#PBF
HK$26.615
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. 923-3713
Mfr. Part No.INA193AIDBVT
HK$13.984
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. 922-3344
Mfr. Part No.XTR111AIDGQT
HK$9.434
Each (On a Reel of 250)
units
- - - - - - - - - - - - - -
RS Stock No. 730-0556
Mfr. Part No.INA219BIDCNT
HK$21.01
Each
units
- - - - - - - Surface Mount SOT-23 8 3 x 1.75 x 1.3mm 1.3mm 3mm -
RS Stock No. 545-7669
Mfr. Part No.INA198AIDBVT
HK$25.142
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. 197-7170
Mfr. Part No.INA169NA/250
HK$14.892
Each (On a Reel of 250)
units
Single 5 V - 100dB 1 Current - - SOT-23 5 - - - -
RS Stock No. 423-472
Mfr. Part No.LTC6102CMS8#PBF
HK$32.82
Each
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. 177-7160
Mfr. Part No.LT6100IMS8#PBF
HK$16.88
Each (In a Tube of 50)
units
Single 2.7 → 36 V - 100dB 1 Differential 145 μA Surface Mount MSOP 8 3 x 3 x 0.86mm 0.86mm 3mm 36 V
RS Stock No. 170-8124
Mfr. Part No.ISL28022FRZ-T7A
BrandIntersil
HK$19.836
Each (On a Reel of 250)
units
Single 3.3 V - 110dB 2 Open Drain 0.7 mA Surface Mount QFN 16 3 x 3 x 0.85mm 0.85mm 3mm 5.5 V
RS Stock No. 197-7171
Mfr. Part No.INA169NA/250
HK$25.142
Each (In a Pack of 5)
units
Single 5 V - 100dB 1 Current - - SOT-23 5 - - - -
RS Stock No. 190-4330
Mfr. Part No.MAX4376FAUK+T
HK$9.187
Each (On a Reel of 2500)
units
Single 3 → 28 V - 90dB 1 Buffered 2.2 mA 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 -
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