24 V GMR current sensor

4 March 2009 Passive Components

NVE’s AAV003-10E GMR current sensor now features a maximum bridge input voltage of 24 V, as opposed to its former rating of 12 V, making it compatible with PLC logic applications for industrial process control and instrumentation.

The sensor features high linearity and low hysteresis with an on-chip current strap. A GMR bridge sensor element close to the current strap senses the magnetic field created by the current. The GMR sensor element uses a unique, bipolar-output, low-hysteresis GMR material for excellent accuracy. The four terminals of the bridge sensor are available externally. The output terminals of the bridge provide a bipolar voltage signal proportional to the current through the strap.

The module provides typical sensitivity of 2 mV/mA with no amplification from

-80 mA to +80 mA. This sensitivity makes it suitable for 4–20 mA current loop detection. In addition to the higher bridge voltage specification, the sensor now has an isolation voltage specification of 240 Vrms.

The sensor comes in an ultra-miniature 2,5 x 2,5 mm 6-pin TDFN package.

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