MCS1803 Current Sensor


Hall Effect Linear Current Sensor, 5V, 5-50A, 2400V

The MCS1803 is a Hall effect-based linear current sensor IC for AC or DC current sensing. The Hall array is differential to cancel out any stray magnetic field.

A low resistance primary conductor allows current flow within close proximity of an integrated circuit containing high accuracy Hall sensors. This current generates a magnetic field which is sensed at two different points by the integrated Hall transducers. The magnetic field difference between these two points is then converted into a voltage proportional to the applied current. Spinning current technique is used for a low stable offset.

The galvanic isolation between the pins of the primary conductive path and the sensor leads allows the MCS1803 to replace opto-isolators or other expensive isolation devices.

The MCS1803 requires a minimum number of readily available, standard external components. It is available in a SOIC-8 package. The small footprint saves board area and is ideal for space-constrained applications.


  • 5V single supply
  • Immune to external magnetic fields by differential sensing
  • 2.4 kVRMS minimum isolation voltage from pins 1-4 to pins 5-8
  • Operating temperature -40°C to 125°C
  • 0.9 mΩ internal conductor resistance
  • 5A to 50A range (see ordering information)
  • Adjustable bandwidth, up to 100kHz
  • 4μs output rise time
  • Ratiometric output from supply voltage
  • Output proportional to AC or DC currents
  • Factory-trimmed for accuracy
  • No magnetic hysteresis
  • Integrated shield suppressing capacitive coupling from current conductor to die (up to 10V/ns)
  • SOIC-8 package


  • Motor control
  • Automotive systems
  • Load detection & management
  • Switched-mode power supplies
  • Over-current fault protection

Ordering Information

Part No



Current Range


Typ. Sensivity




Isaolation Voltage


MCS1803GS-05 5 ±5 400 2.5 2400
MCS1803GS-10 5 ±10 200 2.5 2400
MCS1803GS-20 5 ±20 100 2.5 2400
MCS1803GS-30 5 ±30 66 2.5 2400
MCS1803GS-40 5 ±40 50 2.5 2400
MCS1803GS-50 5 ±50 40 2.5 2400


MCS1803 datasheet

MCS180x Family Current Sensors Brochure

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