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ROSEMONT, Ill, January 13, 2026 -- Littelfuse, Inc. (NASDAQ: LFUS), a diversified, industrial technology manufacturing company empowering a sustainable, connected, and safer world, today announced the launch of two next-generation omnipolar magnetic switches, the LF21173TMR and LF21177TMR. These devices combine Tunneling Magnetoresistance (TMR) and CMOS technologies in a compact LGA4 package, providing ultra-low power consumption, exceptional magnetic sensitivity, and fast response for compact, battery-powered systems. (View the video in English, Chinese, and Japanese)

Designed for operation across a wide voltage range (1.8 V–5.5 V), the LF21173TMR and LF21177TMR support multiple magnetic thresholds, enabling flexible integration into space-constrained applications such as smart meters, electronic locks, medical devices, and portable consumer electronics. Compared with conventional Hall-effect switches, these TMR devices deliver significantly higher sensitivity and lower power draw, helping engineers build smaller, more energy-efficient, and longer-lasting products.

“With the launch of the LF21173TMR and LF21177TMR switches, we’re bringing our customers a new level of precision and efficiency in magnetic sensing,” said Julius Venckus, Global Product Manager, Sensors at Littelfuse. “By integrating advanced TMR technology, this switch delivers ultra-low power consumption and high sensitivity—solving key challenges in compact, battery-powered designs. It’s a game-changer for engineers building smarter, more reliable devices in industrial, medical, and consumer applications.”

TMR Advantage

Unlike traditional hall-effect technology that relies on the hall voltage generated by magnetic flux, TMR sensors measure resistance changes in magnetic tunnel junctions, producing stronger signal output at much lower current levels. The result is a switch that consumes less power while maintaining excellent accuracy and thermal stability—ideal for energy-constrained applications where every microamp counts.

At-a-Glance: Key Features and Benefits

Ultra-low power consumption extends battery life in portable devices.
High magnetic sensitivity (9 – 30 Gauss) ensures reliable detection with smaller magnets.
Wide 1.8 V–5.5 V operating range supports flexible system integration.
Fast response time enables precise, real-time sensing.
Compact LGA4 package fits space-constrained designs.
Omnipolar operation detects both the north and south poles, simplifying the layout.

Markets and Applications

Health care: continuous glucose monitors and drug delivery pens
Building automation: smart gas and water meters
Consumer electronics: robotic appliances and portable devices
Industrial automation: industrial controls and electronic locks
Transportation: e-bikes, two-/three-wheelers, and off-highway vehicles

The LF21173TMR and LF21177TMR expand the Littelfuse magnetic sensors portfolio, empowering engineers to design the next generation of compact, energy-efficient smart devices that seamlessly sense, respond, and perform with precision.

Frequently Asked Questions: LF21173TMR and LF21177TMR TMR Switches

Are these switches compatible with standard CMOS circuits?
Yes. The integrated CMOS output interface ensures easy connection with low-power logic circuits, making these TMR switches drop-in ready for a wide range of electronic designs.

LFxxxxxTMR Switches Image

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Littelfuse Expands Magnetic Sensor Portfolio with Ultra-Low-Power Omnipolar TMR Switches

Frequently Asked Questions: LF21173TMR and LF21177TMR TMR Switches