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. 145-7057
Mfr. Part No.LTC6104CMS8#PBF
£2.489
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. 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. 661-3422
Mfr. Part No.INA206AID
£2.13
Each
Units
- - - - - - - Surface Mount SOIC 14 8.65 x 3.91 x 1.58mm 1.58mm 8.65mm -
RS Stock No. 165-9409
Mfr. Part No.MAX9611AUB+
BrandMaxim
£1.544
Each (In a Tube of 50)
Units
Single 2.7 → 5.5 V - 106dB 1 Rail to Rail 2.6 mA Surface Mount μMAX 10 3.05 x 3.05 x 0.95mm 0.95mm 3.05mm 6 V
RS Stock No. 817-6580
Mfr. Part No.INA219AID
£2.00
Each (In a Pack of 5)
Units
Single 3 → 5.5 V - 100dB 1 Bidirectional 1 mA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 5.5 V
RS Stock No. 162-8163
Mfr. Part No.INA199A2DCKT
£0.441
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. 761-6328
Mfr. Part No.LMP8601MA/NOPB
£2.62
Each
Units
Single 5 V - 80dB 1 Bidirectional, Differential, Rail to Rail, Unidirectional 1.3 mA Surface Mount SOIC 8 4.9 x 3.9 x 1.45mm 1.45mm 4.9mm 5.5 V
RS Stock No. 103-9967
Mfr. Part No.MAX4080TASA+
BrandMaxim
£1.198
Each (In a Tube of 100)
Units
Single 4.5 → 76 V - 100dB 1 Rail to Rail 0.19 mA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 76 V
RS Stock No. 162-8164
Mfr. Part No.INA199A3DCKT
£0.353
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. 732-7891
Mfr. Part No.MAX4080TASA+
BrandMaxim
£1.36
Each
Units
Single 4.5 → 76 V - 100dB 1 Rail to Rail 0.19 mA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 76 V
RS Stock No. 798-9903
Mfr. Part No.AD8418AWBRZ
£2.31
Each
Units
Single 2.7 → 5.5 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. 820-9750
Mfr. Part No.AD8418AWBRMZ
£1.208
Each (In a Pack of 5)
Units
Single 5 V - 90dB 1 Bidirectional 130 μA Surface Mount MSOP 8 3.2 x 3.2 x 0.95mm 0.95mm 3.2mm 5.5 V
RS Stock No. 912-9914
Mfr. Part No.AD8218BRMZ
£1.637
Each (In a Tube of 50)
Units
Single 4 → 80 V - 90dB 1 Rail to Rail 60 μA Surface Mount MSOP 8 3.2 x 3.2 x 0.95mm 0.95mm 3.2mm 80 V
RS Stock No. 160-4523
Mfr. Part No.AD8213YRMZ
£2.171
Each (In a Tube of 50)
Units
Single 5 V - 100dB 2 Buffered 3.7 mA Surface Mount MSOP 10 3.1 x 3.1 x 0.95mm 0.95mm 3.1mm 5.5 V
RS Stock No. 162-6302
Mfr. Part No.LMP8602MME/NOPB
£1.185
Each (On a Reel of 250)
Units
Single 5 V - 80dB 1 Bidirectional, Differential, Rail to Rail, Unidirectional 1.3 mA Surface Mount MSOP 8 4.9 x 3.9 x 1.45mm 1.45mm 4.9mm 5.5 V
RS Stock No. 811-5800
Mfr. Part No.LMP8645MKE/NOPB
£1.892
Each (In a Pack of 5)
Units
Dual - ±12 V, ±2.7 V, ±5 V 95dB 1 Buffered 710 μA Surface Mount SOT-23 6 3.05 x 1.75 x 1mm 1mm 3.05mm 12 V
RS Stock No. 761-6330
Mfr. Part No.LMP8602MME/NOPB
£1.17
Each
Units
Single 5 V - 80dB 1 Bidirectional, Differential, Rail to Rail, Unidirectional 1.3 mA Surface Mount MSOP 8 4.9 x 3.9 x 1.45mm 1.45mm 4.9mm 5.5 V
RS Stock No. 919-9550
Mfr. Part No.LTC6101BIS5#TRMPBF
£1.933
Each (On a Reel of 500)
Units
Single 4 → 60 V 4 → 60V - 1 Unidirectional 0.64 mA Surface Mount TSOT-23 5 2.9 x 1.75 x 0.9mm 0.9mm 2.9mm 60 V
RS Stock No. 819-7294
Mfr. Part No.AD8213YRMZ
£2.16
Each (In a Pack of 2)
Units
Single 5 V - 100dB 2 Buffered 3.7 mA Surface Mount MSOP 10 3.1 x 3.1 x 0.95mm 0.95mm 3.1mm 5.5 V
RS Stock No. 159-9535
Mfr. Part No.AD8418AWBRZ
£1.764
Each (In a Tube of 98)
Units
Single 2.7 → 5.5 V - 90dB 1 Buffered 4.1 mA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 5.5 V
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