Using proven ultra low power consumption TMR magnetic sensor technology, the high-performance RedRock® analog and digital TMR magnetic sensors have numerous technologically-advanced applications in multiple markets. Offering the lowest power consumption, highest sensitivity, ultra-miniature package size, short lead times and a highly-competitive price, the TMR Magnetic Sensor devices are ideally suited to the demands of next generation security, metering, medical, automotive, instrumentation, and industrial markets. Target applications include fluid level detection, open-close detection, proximity, rotary sensing, smart phones, tablets and laptops, “wake-up” and more.  Due to their low power consumption, high sensitivity, small size and ready availability, RedRock® magnetic sensors are popular alternatives to existing Hall Effect sensors and Reed Switches.

Please note that the RR111, RR121 & RR131 TMR Sensor series are approaching end-of-life; they are being replaced by Coto’s new RR112, RR122 and RR132 series sensors.  Consult the official EOL notification today for recommended replacements!  Or contact with questions.

For Product Specifications Comparisons (RR121,RR131 vs. RR122, RR132), please consult our Product Comparison Guide

For recommendations regarding RR111 to RR112 conversion, please contact directly.



wdt_ID Part Number Coto Part Number Datasheet Magnetic Polarity Response Operative Sensitivity (G) Release Sensitivity (G) Frequency (Hz) IAVG (µA) Temp Rating (ºC) Supply Voltage (VDD) Output Response Package Axis of Sensitivity
wdt_ID Coto Part Number Datasheet Magnetic Polarity Response Magnetic Sensitivity Range Minimum (G) Magnetic Sensitivity Range Maximum (G) Frequency (Hz) IAVG (µA) Temp Rating (ºC) Supply Voltage (VDD) Output Response Package Axis of Sensitivity


TMR Magnetic Sensor Applications
  • Proximity Detection
  • Rotary Sensing
  • Fluid Level Detection
  • Door & Lid Closure Detection
  • Utility Meters
  • Portable Medical Devices
  • Motor Controllers
  • Consumer Electronics
  • Wake-Up uProcessor

Security Sensors - Using RedRock® TMR Magnetic Sensors in Security Applications

Security applications use magnetic sensing in their devices to detect the unauthorized opening of a door or window. The main mechanism typically consists of a digital magnetic sensor and a magnet that are close to each other when the door/window is closed. In the event of an intrusion, the magnet moves away from the sensor, an action which is designed to trigger an alarm. While the application is fairly simple, the requirements of the sensor are significant. Featuring RedRock® TMR magnetic sensors’ extremely low power consumption, high sensitivity, ultra-miniature size and high degree of robustness and reliability, this brief video demonstrates TMR to be the ideal solution when used in security devices.

Proximity Sensing with RedRock® TMR Magnetic Sensors

RedRock® TMR magnetic sensors can be used in a wide variety of proximity applications such as detecting the opening/closure of an automatic sliding gate or detecting position of a linear actuator or a conveyor belt. This brief video demonstrates an example using feedback from a TMR sensor to stop a moving motor. Requirements met by the TMR sensors are high reliability, extremely low current drain (which is important if the device is battery powered) and a high level of sensitivity.

Device "Wake-Up" Sensors - using RedRock® TMR Magnetic Sensors

To conserve battery power, many devices are kept “asleep” or turned off until the time is right for them to operate. When the device is removed from its enclosure, a sensor is used to trigger its “wake-up.” In this brief video, this function is explained and demonstrated using a RedRock® TMR magnetic sensor within a medical pill camera device which requires the sensor to be tiny, highly sensitive and able to operate within a hermetically-sealed environment while using nearly zero power.

Overview - Gen 2.0 TMR Demo Board (Tony Parakka)

Coto Technology Applications Engineer, Tony Parakka, provides a peek at Coto's newest 2.0 Generation demo board featuring RedRock TMR magnetic sensor products: RR111 (Analog Output); RR120 (Digital Unipolar Sensor); RR121 (Bipolar Digital Latching) and RR121 (Digital Omnipolar ). This video serves as a basic overview of the different products. Engineers can opt to see more in-depth, functional discussions on each individual product in Coto's new 4-video series of Engineering Discussions.

Coto Technology