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. 170-8232
Mfr. Part No.ISL28006FH50Z-T7A
£1.228
Each (On a Reel of 250)
Units
Single 2.7 → 28 V - 105dB 1 - 50 μA Surface Mount SOT-23 5 2.9 x 1.6 x 1.14mm 1.14mm 2.9mm 28 V
RS Stock No. 919-9881
Mfr. Part No.LT6106HS5#TRMPBF
£1.135
Each (On a Reel of 500)
Units
Single 2.7 → 36 V - - 1 - 115 μA Surface Mount TSOT-23 5 2.9 x 1.75 x 0.9mm 0.9mm 2.9mm 36 V
RS Stock No. 921-5961
Mfr. Part No.ISL28006FH50Z-T7A
£1.248
Each (In a Pack of 5)
Units
Single 2.7 → 28 V - 105dB 1 - 50 μA Surface Mount SOT-23 5 2.9 x 1.6 x 1.14mm 1.14mm 2.9mm 28 V
RS Stock No. 166-0789
Mfr. Part No.TSC101CILT
£0.379
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. 761-8894
Mfr. Part No.LT6105IMS8#PBF
£2.21
Each
Units
Single 36 V - 90dB 1 Differential 0.35 mA Surface Mount MSOP 8 3 x 3 x 0.86mm 0.86mm 3mm 36 V
RS Stock No. 919-9354
Mfr. Part No.LT6105IMS8#PBF
£1.479
Each (In a Tube of 50)
Units
Single 36 V - 90dB 1 Differential 0.35 mA Surface Mount MSOP 8 3 x 3 x 0.86mm 0.86mm 3mm 36 V
RS Stock No. 786-9727
Mfr. Part No.LT6106HS5#TRMPBF
£1.234
Each (In a Pack of 5)
Units
Single 2.7 → 36 V - - 1 - 115 μA Surface Mount TSOT-23 5 2.9 x 1.75 x 0.9mm 0.9mm 2.9mm 36 V
RS Stock No. 121-9260
Mfr. Part No.INA210AIDCKT
£0.813
Each (On a Reel of 250)
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. 103-9965
Mfr. Part No.MAX4080SAUA+
£1.284
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. 145-7057
Mfr. Part No.LTC6104CMS8#PBF
£1.547
Each (In a Tube of 50)
Units
Single 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V - - 1 - 1.04 mA Surface Mount MSOP 8 3 x 3 x 0.86mm 0.86mm 3mm 60 V
RS Stock No. 761-8897
Mfr. Part No.LT6106CS5#TRMPBF
£1.69
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. 779-9568
Mfr. Part No.LT2940IMS#PBF
£4.80
Each
Units
Single 80 V - - 1 Bidirectional 5 mA Surface Mount MSOP 12 4.039 x 3 x 0.86mm 0.86mm 4.04mm 80 V
RS Stock No. 423-478
Mfr. Part No.LTC6104CMS8#PBF
£1.57
Each
Units
Single 12 V, 15 V, 18 V, 24 V, 28 V, 5 V, 9 V - - 1 - 1.04 mA Surface Mount MSOP 8 3 x 3 x 0.86mm 0.86mm 3mm 60 V
RS Stock No. 155-5368
Mfr. Part No.LT2940IMS#PBF
£3.185
Each (In a Tube of 37)
Units
Single 80 V - - 1 Bidirectional 5 mA Surface Mount MSOP 12 4.039 x 3 x 0.86mm 0.86mm 4.04mm 80 V
RS Stock No. 169-5577
Mfr. Part No.INA206AID
£1.921
Each (In a Tube of 50)
Units
- - - - - - - Surface Mount SOIC 14 8.65 x 3.91 x 1.58mm 1.58mm 8.65mm -
RS Stock No. 923-6908
Mfr. Part No.INA213AIDCKT
£0.813
Each (On a Reel of 250)
Units
Single 3 V, 5 V, 9 V, 12 V, 15 V, 18 V, 24 V - 100dB 1 - - Surface Mount SC-70 6 2 x 1.25 x 0.9mm 0.9mm 2mm 26 V
RS Stock No. 709-4535
Mfr. Part No.INA213AIDCKT
£2.01
Each
Units
Single 12 V, 15 V, 18 V, 24 V, 3 V, 5 V, 9 V - 100dB 1 - - Surface Mount SC-70 6 2 x 1.25 x 0.9mm 0.9mm 2mm 26 V
RS Stock No. 732-7882
Mfr. Part No.MAX4080SAUA+
£1.51
Each
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. 423-472
Mfr. Part No.LTC6102CMS8#PBF
£3.34
Each
Units
Single 12 V, 15 V, 18 V, 24 V, 28 V, 5 V, 9 V - - 1 - 0.45 mA Surface Mount MSOP 8 3 x 3 x 0.86mm 0.86mm 3mm 60 V
RS Stock No. 919-9358
Mfr. Part No.LT6106CS5#TRMPBF
£1.026
Each (On a Reel of 500)
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
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Current Sensing Amplifiers have a voltage output that ...
Description:
Current Sensing Amplifiers have a voltage output that is proportional to the volt drop across a very low value resistor, usually in a high-current power rail. Hence they measure the current flowing in that power rail.
Current Sensing Amplifiers have a voltage output that ...
Description:
Current Sensing Amplifiers have a voltage output that is proportional to the volt drop across a very low value resistor, usually in a high-current power rail. Hence they measure the current flowing in that power rail.
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