NVE Introduces High-Sensitivity Nanopower TMR Magnetic Switches

Nanotech firm NVE Corporation, a developer of high-performance spintronics devices, has added two high-sensitivity models to its revolutionary ADT9xx-Series of tunneling magnetoresistance (TMR) magnetic switches. Fast, tiny and requiring little power, they provide attractive options for designers of battery-powered products such as utility meters and portable instruments. 

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Depicted above is a scene from a demonstration of the remarkable sensitivity of one of the new parts, available as a video on the company’s website. The new models provide magnetic operate points as low as 1.5 mT. The field can be either polarity, and the magnetic operate point is extremely stable over supply voltage and temperature. 

The ADT9xx-Series sensors operate from 2.4 to 4.2 volts, ideal for lithium or lithium-ion batteries and 3.3-volt supplies. TMR technology provides ultralow power. Typical quiescent supply current is just one microamp with no duty cycling. Less than the self-discharge rate of typical lithium-ion batteries, that makes the new sensors ideal for battery applications. 

Continuous operation without duty cycling means the sensors are fast, able to switch at more than 20 kilohertz. Outputs are configured as magnetic “switches,” turning on when a magnetic field is applied and off when the field is removed. 

Based in Eden Prairie, Minnesota, NVE is a leader in the practical commercialization of spintronics, a nanotechnology that relies on electron spin rather than electron charge to acquire, store and transmit information. The company manufactures an extensive portfolio of spintronic products including sensors and couplers that are used to acquire and transmit data. Visit www.nve.com for more info.