TMR Switch – Littlefuse
Digital magnetic switch integrating TMR and CMOS technologies.
The TMR Switch is a digital magnetic switch that combines Tunneling Magnetoresistance (TMR) and CMOS technologies to provide highly sensitive magnetic detection with ultra-low power consumption.
The device integrates a TMR magnetic sensor and CMOS signal-processing circuitry within a single package, including an on-chip TMR voltage generator, voltage amplifier, comparator, and Schmitt trigger for precise switching and excellent noise immunity. An internal bandgap regulator delivers temperature-compensated supply voltage, ensuring stable performance across a wide operating voltage range.
Available in the compact SOT23-3 package, the TMR Switch is well suited for battery-powered applications, smart gas and water meters, industrial sensors, and IoT devices.
Key Features
- TMR technology with operating points (Bop) of 5, 7, 10, 14, or 17 Gauss
- Ultra-low power consumption: 200 nA at 50 Hz response or 1.5 µA at 1 kHz response
- Available with X-axis or Z-axis sensing
- Unipolar, omnipolar, or bipolar (latching) operating modes
- Excellent thermal stability
- Open-drain or push-pull output options
- Compact SOT23-3 package