High Linearity/High Resolution Contactless Current Sensor


CT220: High Linearity/High Resolution Contactless Current Sensor Product Image


Top Features

Typical Applications


The CT220 is a high linearity and high-resolution contactless current sensor from Allegro MicroSystems developed on its patented XtremeSense™ TMR technology with the capability of measuring up to 1,000 A. It measures the magnetic field of the current flowing through a busbar or printed circuit board (PCB) trace and converts it to an analog output voltage that represents the field and therefore current.

The CT220 is an ideal contactless current sensing solution for applications that need to have excellent isolation and accurate current measurements. There are four (4) variants of the CT220 that will sense the following magnetic fields: ±1.5 mT, ±5.0 mT, ±10.0 mT and ±15.0 mT.

  • AC or DC Contactless Current Sensing Range: Up to 1,000 A
  • Resolution of 5 mA
  • Inherently High Isolation
  • Magnetic Field (Current) Range:
    • ±1.5 mT
    • ±5.0 mT
    • ±10.0 mT
    • ±15.0 mT
  • Stable Performance over Temperature
  • Supply Current: ~1.2 mA
  • FLAG Pin to Indicate 90% and 10% of Full Field Range
    • Active LOW Digital Output (Push-pull)
  • Supply Voltage: 2.7 V to 5.5 V
  • Operating Temperature Ranges:
    • Industrial: -40°C to +85°C
    • Extended Industrial: -40°C to +125°C
  • Package: 5-Lead SOT23

The CT220 is available in an industry standard 5-lead SOT23-5 package.

Part Number Specifications and Availability

Documentation and Resources