Lowest power magnetic switch uses nanoamps

Lowest power magnetic switch uses nanoamps

New Products |
By Graham Prophet

The company is introducing its CT832 Digital Magnetic Switch, in the CT83X series, a multi- function switching device with high sensitivity, reliability and new lows in power consumption, that it positions as the industry’s lowest power consuming switch.


The solid-state magnetic switches provide higher reliability, faster frequency response, and extremely low power consumption in small form factor for battery powered applications. The CT83X has both a digital and analogue (proportional to field strength) output that serves multiple applications from a single switch with lower power consumption; when configured solely with a digital output it becomes the industry’s lowest power consuming switch with only 200 nA. It will operate with large air gaps and with fields a low as 3 mT (milli-Tesla). Packaging is SOT-23 or low-profile LGA, 1.4 x 1.4 mm.


“…[A] magnetic switch that combines the lowest power consumption with multiple functionalities to bring intelligence sensing to wide a variety of applications and systems, …across consumer goods, industrial applications, and IoT.” states Zak Deiri, Chief Sales and Marketing Officer, Crocus Technologies.


Approximately the size of a typical shunt resistor, the CT83X not only replaces it but provides added intelligence with enhanced switching and current monitoring capability. The CT83X either detects the magnetic field as generated by a permanent magnet or induced by a current-carrying conductor. As a contactless current switch, the CT83X monitors the current on a wire or the PCB trace used with many IoT applications, appliances, and industrial automation environments. The contactless nature of the CT832X enables safe, non-invasive current monitoring. When used as a proximity switch, it will detect window or door movement in intrusion alarm systems and appliances, while the additional analogue output adds another dimension of intelligence by sensing if the window or door is ajar with its proximity detection capability. Unlike typical Hall sensors, the CT83X offers high sensitivity for large air gap environment to provide System Designers greater flexibility.


In smart flow meters, for example, the CT83X acts as a safeguard against tampering by allowing the analogue output to detect specific magnetic field signatures of the application. The digital output provides the common switching signal to microcontrollers and application specific circuits, while the analogue output provides proximity measurement.


Additional applications include activating wake-up and sleep modes in mobile devices such as laptops with open/closed lid detection, white goods, electric vehicles where up to 35 switches may be employed, industrial applications and the growing number of IoT environments that require high sensitivity, multi-functional performance with low power consumption.


NXP licenses Crocus

Crocus also recently announced that it has licensed advanced magnetic TMR technology to NXP Semiconductors, for automotive semiconductor solutions where TMR will help enable the next generation of applications such as Power steering and Electronic Throttle Control (ETC). Crocus’ TMR magnetic sensor technology is ‘CMOS-friendly’, and lends itself to high volume manufacturing.



The Crocus advanced sensor technology will allow NXP to deliver greater sensitivity, performance, reduced power consumption and improved integration for its automotive applications. Crocus makes this possible by offering NXP a viable and robust technology to address a wide range of applications.


“As the industry steers towards higher energy/fuel efficiency, autonomous cars, and higher connectivity, we expect TMR magnetic sensors will play an increasingly important role in the development of smarter features and functionality,” said Stephan zur Verth, Vice President Magnetic Sensors, NXP.


Crocus Technology;


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