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. 145-1310
Mfr. Part No.LT1999IMS8-20#PBF
HK$29.441
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. 122-0319
Mfr. Part No.ZXCT1110W5-7
HK$4.166
Each (On a Reel of 3000)
units
- - - - - - - - - - - - - -
RS Stock No. 168-4361
Mfr. Part No.INA213AIDCKR
HK$7.521
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. 162-6301
Mfr. Part No.LMP8602MA/NOPB
HK$26.333
Each (In a Tube of 95)
units
Single 5 V - 80dB 1 Bidirectional, Differential, Rail to Rail, Unidirectional 1.3 mA Surface Mount SOIC 8 3 x 3 x 0.86mm 0.86mm 3mm 5.5 V
RS Stock No. 738-5285
Mfr. Part No.ZXCT1110W5-7
HK$7.38
Each (In a Pack of 5)
units
- - - - - - - - - - - - - -
RS Stock No. 661-3407
Mfr. Part No.XTR111AIDGQT
HK$22.99
Each
units
- - - - - - - Surface Mount HTSSOP 10 3 x 3 x 1.02mm 1.02mm 3mm -
RS Stock No. 162-8163
Mfr. Part No.INA199A2DCKT
HK$4.567
Each (On a Reel of 250)
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. 165-9686
Mfr. Part No.MAX9919NASA+
HK$19.883
Each (In a Tube of 100)
units
Single 4.5 → 5.5 V - 80dB 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. 829-1541
Mfr. Part No.TSC1021AIYPT
HK$5.304
Each (In a Pack of 10)
units
Single - - 90dB 2 Analogue 450 μA Surface Mount TSSOP 8 4.5 x 3.1 x 1.05mm 1.05mm 4.5mm 5.5 V dc
New
RS Stock No. 189-8723
Mfr. Part No.MAX4173FESA+
HK$13.024
Each (In a Pack of 10)
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. 162-8164
Mfr. Part No.INA199A3DCKT
HK$4.567
Each (On a Reel of 250)
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. 165-9687
Mfr. Part No.MAX9920ASA+
HK$17.178
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
New
RS Stock No. 191-4880
Mfr. Part No.MAX4378FAUD+
HK$26.722
Each (In a Pack of 5)
units
Single 3 → 28 V - 90dB - Voltage 2.2 mA Surface Mount TSSOP 14 5.1 x 4.5 x 0.95mm 0.95mm 5.1mm 28 V
New
RS Stock No. 191-5281
Mfr. Part No.MAX4373FEUA+
HK$21.559
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. 884-6775
Mfr. Part No.LTC6102HMS8#PBF
HK$37.11
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
RS Stock No. 162-5367
Mfr. Part No.INA202AIDGKT
HK$15.347
Each (On a Reel of 250)
units
- - - - - - - Surface Mount MSOP 8 3 x 3 x 0.97mm 0.97mm 3mm -
RS Stock No. 761-6334
Mfr. Part No.LMP8603MA/NOPB
HK$25.26
Each
units
Single 5 V - 80dB 1 Bidirectional, Differential, Rail to Rail, Unidirectional 1.3 mA Surface Mount SOIC 8 3 x 3 x 0.86mm 0.86mm 3mm 5.5 V
RS Stock No. 162-4671
Mfr. Part No.INA198AIDBVT
HK$14.504
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. 761-8897
Mfr. Part No.LT6106CS5#TRMPBF
HK$18.58
Each
units
Single 36 V - - 1 - 0.13 mA Surface Mount TSOT-23 5 2.9 x 1.75 x 0.9mm 0.9mm 2.9mm 36 V
RS Stock No. 661-3356
Mfr. Part No.INA201AIDGKT
HK$19.164
Each (In a Pack of 5)
units
- - - - - - - Surface Mount MSOP 8 3 x 3 x 0.97mm 0.97mm 3mm -
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