Omnipolar TMR low-power switch sensor is from Littelfuse| Electronics Weekly

The part enables high-sensitivity magnetic field sensing with 1.5 µA current draw for always-on, battery-powered designs.

Omnipolar detection

The company highlights that, unlike traditional hall-effect sensors, the TX00AS314TRA features omnipolar detection. This allows it to respond to both north and south magnetic poles.

This simplifies magnet alignment, reduces mechanical constraints, and accelerates system design, says Littelfuse.

“The TX00AS314TRA delivers a meaningful advancement in magnetic sensing efficiency,” said Julius Venckus, Sensors Global Products Manager at Littelfuse.

“By combining omnipolar sensing with ultra-low 1.5µA power consumption, it enables engineers to design smaller, longer-lasting systems while simplifying mechanical and electrical design challenges.”

TX00AS314TRA

The TX00AS314TRA integrates a precision TMR (tunnel magnetoresistance) sensing element with CMOS signal-processing circuitry. This includes an on-chip voltage generator, low-noise amplifier, comparator, and Schmitt trigger—to deliver accurate switching, strong noise immunity, and thermal stability.

The device features X-axis (in-plane) magnetic sensing, enabling detection of magnetic fields parallel to the sensor surface, for greater mechanical design flexibility.

As mentioned, it operates with a typical supply current of 1.5 µA while supporting high-speed detection up to 1 kHz, enabling reliable sensing in dynamic, always-on systems. It is designed for clean, bounce-free switching even in electrically noisy environments.

The TX00AS314TRA TMR switches are available in tube or tape-and-reel packaging.

Possible applications for the omnipolar switches include building and home automation. For example, smart meters with tamper detection, position and limit sensing. Or industrial automation, such as for proximity sensing. Or consumer electronics, for example, in appliances, power tools, battery-powered IoT, and wearable devices).

Request samples should be through any authorised Littelfuse distributor.

Starting 95 years ago, the headquarters of Littelfuse are in Chicago, Illinois

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