The LF21173TMR and LF21177TMR, two next-generation omnipolar magnetic switches, were unveiled by Littelfuse.
These devices offer ultra-low power consumption, remarkable magnetic sensitivity, and fast response for compact, battery-powered systems by combining CMOS and Tunneling Magnetoresistance (TMR) technologies in a compact LGA4 package.
The LF21173TMR and LF21177TMR are designed to operate across a wide voltage range (1.8 V–5.5 V) and support multiple magnetic thresholds, allowing for flexible integration into space-constrained applications such electronic locks, smart meters, medical equipment, and portable consumer electronics.
These TMR devices have noticeably higher sensitivity and lower power consumption than traditional Hall-effect switches, helping engineers to develop more compact, long-lasting, and energy-efficient products.
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
- Healthcare: 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.
TMR Sensors 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.
Key Comment
“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.”
Availability
They are available in tape-and-reel format in quantities of 3000 pieces. Sample requests are accepted through authorized Littelfuse distributors worldwide.
For a listing of Littelfuse distributors, CLICK HERE
Know More Here About LF21173TMR and LF21177TMR Product Pages
