NVE Corporation has introduced a new series of tunneling magnetoresistance (TMR) magnetic switches that combine low voltage, low power requirements and high speed making them attractive for battery applications. The new AHT series becomes the third group in the company’s line of nano-power magnetic sensors.
TMR technology enables the ultralow power capability. They can operate in power conditions as low as 0.9 volts, so they can be powered by single-cell alkaline batteries, says NVE. Typical quiescent supply current is less than one microamp with no duty cycling. That means the parts will run nearly forever on button cells, making them well suited for battery-operated medical devices, utility meters and portable instruments.
Outputs are configured as magnetic switches, turning on when a magnetic field is applied and off when the field is removed. The field can be either polarity. They feature high sensitivity with magnetic operate points as low as 1.5 millitesla.
NVE has two other families of nano-power sensors. AHL-Series GMR magnetic switches have a 0.9 to 2.4-volt supply range. ADT-Series GMR magnetic switches have a 2.4 to 3.6-volt supply range for 3.3-volt or lithium battery power supplies. AHT- and AHL-Series sensors use giant magnetoresistance (GMR) technology with continuous-duty and duty-cycled versions. All the sensors are available with a choice of magnetic operate points.
For more info, see www.nve.com.