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
New
RS Stock No. 190-4309
Mfr. Part No.MAX4081TAUA+
BrandMaxim
£1.459
Each (In a Tube of 50)
Units
Single 4.5 → 76 V - 100dB 1 Voltage 190 μA Surface Mount μMAX 8 3.1 x 3.1 x 0.95mm 0.95mm 3.1mm 76 V
RS Stock No. 185-8901
Mfr. Part No.NCS210RSQT2G
£0.62
Each (In a Pack of 10)
Units
Single 2.2 → 26 V - 105dB 1 Rail to Rail 60 μA Surface Mount SC-70 6 2.2 x 1.35 x 1mm 1mm 2.2mm 26 V
New
RS Stock No. 189-8799
Mfr. Part No.MAX4080TASA+
BrandMaxim
£1.51
Each (In a Pack of 5)
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. 178-4566
Mfr. Part No.NCS210RMUTAG
£0.358
Each (In a Pack of 50)
Units
Single 5 V - 105dB 1 Rail to Rail 80 μA Surface Mount UQFN 10 1.4 x 1.8 x 0.55mm 0.55mm 1.4mm 26 V
New
RS Stock No. 190-4389
Mfr. Part No.MAX9938FEUK+T
BrandMaxim
£0.567
Each (On a Reel of 2500)
Units
Single 1.6 → 28 V - 94dB 1 Voltage 2.5 μA Surface Mount SOT-23 5 3 x 1.75 x 1.3mm 1.3mm 3mm 28 V
New
RS Stock No. 190-6404
Mfr. Part No.MAX4080SAUA+T
BrandMaxim
£2.256
Each (In a Pack of 5)
Units
Single 4.5 → 76 V - 100dB 1 Voltage 190 μA Surface Mount μMAX 8 3.1 x 3.1 x 0.95mm 0.95mm 3.1mm 76 V
RS Stock No. 178-4386
Mfr. Part No.NCS213RSQT2G
£0.215
Each (On a Reel of 3000)
Units
Single 5 V - 100dB 1 Rail to Rail 80 μA Surface Mount SC-70 6 2.2 x 1.35 x 1mm 1mm 2.2mm 26 V
New
RS Stock No. 189-8749
Mfr. Part No.MAX4173FEUT+T
BrandMaxim
£2.49
Each (In a Pack of 5)
Units
Single 3 → 28 V - 90dB 1 - 1 mA Surface Mount SOT-23 6 3 x 1.75 x 1.3mm 1.3mm 3mm 28 V
New
RS Stock No. 190-6410
Mfr. Part No.MAX4080TASA+T
BrandMaxim
£2.204
Each (In a Pack of 5)
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
New
RS Stock No. 190-6296
Mfr. Part No.MAX4173HESA+
BrandMaxim
£1.123
Each (In a Pack of 10)
Units
Single 3 → 28 V - 90 (Typ.)dB 1 Voltage 1 mA Surface Mount SO 8 5 x 4 x 1.5mm 1.5mm 5mm 28 V
RS Stock No. 811-5793
Mfr. Part No.LMP8602QMA/NOPB
£1.39
Each (In a Pack of 5)
Units
Single 5 V - 90dB 1 Bidirectional 1.3 mA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 60 V
New
RS Stock No. 190-6368
Mfr. Part No.MAX4073TAUT+T
BrandMaxim
£1.834
Each (In a Pack of 5)
Units
Single 3 → 28 V - 90 (Typ.)dB 1 Voltage 1.2 mA Surface Mount SOT-23 6 3 x 1.75 x 1.3mm 1.3mm 3mm 28 V
New
RS Stock No. 190-6571
Mfr. Part No.MAX4081TASA+
BrandMaxim
£1.648
Each (In a Pack of 5)
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
New
RS Stock No. 190-4330
Mfr. Part No.MAX4376FAUK+T
BrandMaxim
£0.90
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
New
RS Stock No. 191-3231
Mfr. Part No.MAX9938HEUK+T
BrandMaxim
£0.567
Each (On a Reel of 2500)
Units
Single 1.6 → 28 V - 94dB 1 Voltage 2.5 μA Surface Mount SOT-23 5 3 x 1.75 x 1.3mm 1.3mm 3mm 28 V
RS Stock No. 178-4384
Mfr. Part No.NCS199A1RSQT2G
£0.215
Each (On a Reel of 3000)
Units
Single 5 V - 100dB 1 Rail to Rail 80 μA Surface Mount SC-70 6 2.2 x 1.35 x 1mm 1mm 2.2mm 26 V
RS Stock No. 860-7517
Mfr. Part No.CS30CL
£0.362
Each (In a Pack of 5)
Units
Single 2.8 → 30 V - - 2 Single Ended - Surface Mount SOT-23 5 3 x 1.75 x 1.3mm 1.3mm 3mm -
New
RS Stock No. 189-9010
Mfr. Part No.MAX9929FAUA+
BrandMaxim
£1.336
Each (In a Pack of 5)
Units
Single - - 87dB 2 Bidirectional, Unidirectional 20 μA Surface Mount μMAX 8 3.1 x 3.1 x 0.95mm 0.95mm 3.1mm 5.5 V
RS Stock No. 795-9259
Mfr. Part No.TSC103IPT
£1.07
Each (In a Pack of 2)
Units
Dual, Single 2.9 → 70 V -2.1 → 65V 90dB 1 Buffered 480 μA Surface Mount TSSOP 8 4.5 x 3.1 x 1.05mm 1.05mm 4.5mm 5.5 V
New
RS Stock No. 189-7297
Mfr. Part No.MAX4080TASA+
BrandMaxim
£1.284
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
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