Littelfuse, an industrial technology manufacturing company shaping solutions for the safe and efficient transfer of electrical energy, announced the TX00AS314TRA Omnipolar TMR Switch Sensor, a high-performance magnetic sensing solution designed for fast response, high sensitivity, and ultra-low power operation in compact, battery-powered applications.
The TX00AS314TRA integrates a precision TMR (tunnel magnetoresistance) sensing element with CMOS signal-processing circuitry—including an on-chip voltage generator, low-noise amplifier, comparator, and Schmitt trigger—to deliver accurate switching, strong noise immunity, and excellent thermal stability. The device features X-axis (in-plane) magnetic sensing, enabling detection of magnetic fields parallel to the sensor surface, thereby enabling greater mechanical design flexibility. It operates with a typical supply current of just 1.5 µA while supporting high-speed detection up to 1 kHz, enabling reliable sensing in dynamic, always-on systems.
Unlike traditional hall-effect sensors, the TX00AS314TRA features omnipolar detection, allowing it to respond to both north and south magnetic poles. This simplifies magnet alignment, reduces mechanical constraints, and accelerates system design. Its precise operate and release thresholds, combined with built-in hysteresis, ensure clean, bounce-free switching even in electrically noisy environments.
“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.”
Key features and benefits
- Ultra-low power consumption (1.5 µA typ.) extends battery life in always-on systems
- High sensitivity (~14 Gauss) enables reliable detection with small magnets
- Omnipolar sensing simplifies design and reduces alignment requirements
- Fast response (up to 1 kHz) supports dynamic and rotational sensing
- Integrated signal conditioning and hysteresis improve noise immunity and switching stability
- Compact SOT-23-3 package supports space-constrained designs
Markets and Applications
The TX00AS314TRA is optimized for applications requiring low power, high reliability, and compact form factors, including:
- Building and home automation (smart meters with tamper detection, position and limit sensing)
- Industrial automation (proximity sensing)
- Consumer electronics (appliances, power tools, battery-powered IoT, and wearable devices)
- Utilities (gas, water, and heat metering)
By enabling accurate magnetic detection with minimal power draw, the device helps engineers design smaller, smarter, and longer-lasting products while reducing maintenance requirements and improving system reliability.
The TX00AS314TRA expands the Littelfuse TMR sensor portfolio, strengthening its position in energy-efficient sensing solutions for next-generation electronics.
Click here to learn more about the TX00 Series.
