Using proven TMR (Tunneling Magnetoresistance) technology, the high-performance RedRock™ RR111 analog TMR magnetic sensor series, the RR121 & RR122 digital sensor series, and the RR131 digital switch series have numerous technologically-advanced applications in multiple markets. Offering both high sensitivity, ultra-miniature package size, ultra-low power consumption and a highly-competitive price, the TMR Magnetic Sensor devices are ideally suited to the demands of next generation medical, automotive, instrumentation, consumer and industrial applications. The tiny TMR Magnetic Sensors offer high magnetic sensitivity with high hysteresis, EMF resistance, and a small package size, all while consuming almost NO POWER!


Coto Technology is the worldwide leader of small signal switching products sold into the Automatic Test Equipment, Data Acquisition, Instrumentation, Process Control, Telecommunications, Medical and Security markets. Our Classic line of Relays & Switches contains a wide range of form and function. And all of our products are 100% tested!


CotoMOS® relays are a reliable and readily-available switching solution by Coto Technology. Utilizing highly-reliable, custom-designed MOSFET technology, CotoMOS® relays provide a high-performance, solid state solution for applications requiring low input power and virtually unlimited life. Ideally suited to the needs of industrial controls, security, metering, instrumentation and automatic test equipment, CotoMOS® relays are available in Form A, Form B, and Form A+B (Form C) form factors to service a wide range of switching requirements.


Located in Mexicali, Mexico, Coto’s manufacturing facility offers a full range of comprehensive services. Provisions include physical resources, engineering, procurement, and supply chain management - as well as production planning and product cell manufacturing using highly-automated, precision machinery in conjunction with complex hand-assembly processing. Finishing services include final product testing, marking, packaging , inventorying and shipping.

News & Events

RedRock® RR122-1B12-511 / 512 TMR Digital Magnetic Sensor Released

The RR122-1B12 TMR sensor features an operating frequency of 2 Hz, a voltage supply range of +1.7V to +5.5V and an extremely strong magnetic sensitivity (30 G or 3 mT) in an ultra-miniature package size at a highly-competitive price.  Read More!

RedRock® RR122-1A22-511 / 512 TMR Digital Magnetic Sensor Released

Coto Technology’s RedRock® RR122-1A22-511 / 512 Series TMR Digital Magnetic Sensor offers the highest sensitivity and lowest power consumption available in an active magnetic sensor. Read More!

RedRock® TMR Sensors Featured on MikroE’s new Click Board

Coto has collaborated with MikroE in their new TMR mix-sens Click Board to target product development engineers who currently use or might use the MikroE ecosystem to speed prototype and development of products using Coto RedRock® TMR magnetic sensors.  Read More!

Covid-19 Update

Although we continue to manufacture at near full capacity with production lead times back to normal, we remain vigilant during the recent resurgence of the Coronavirus. We maintain strict hygiene standards throughout our facilities and conduct scheduled health checks before and during workdays to ensure the safety and well-being of our employees. However, despite all advanced safety measures, adherence to strict guidelines and our “essential business” status, manufacturing sustainability is always a concern as the virus continues to surge worldwide and federal lockdowns become possibilities. We are hopeful that better times are ahead in the near future.  Meanwhile, we wish all good health and safety for the upcoming holiday season.

In Case you Missed it – Tune In to a Recorded Version of Coto at MicroChip’s Livestream Event!

The Use of Low Power Sensors in IoT Applications was be the featured topic on Friday, March 13 at the MicroChip Virtual Conference during IoT Design Week 2020. Coto Technology Business Development Manager, Tim Resker, appeared at the MicroChip studio to help lead the discussion and answer questions about Low-Power TMR Magnetic Sensors in IoT and battery-powered applications. Watch Now!

Understanding TMR Magnetic Sensors (Video)!

Showcasing five of Coto Technology’s RedRock TMR (Tunneling Magnetoresistance) magnetic sensors of omnipolar, unipolar, bipolar and linear types, the RR1EK3-0002 demo board provides an engineering playground designed to promote understanding of TMR’s high-sensitivity and precise polarity performance. Via LED indicator lights, the analog and digital sensors react visually to the provided magnets – demonstrating latching, dual output, wake-up, directional, and other magnetic behaviors.  Check it out here! 

New TMR RR111 Analog Magnetic Sensor Product Released!

Coto Technology’s RedRock™ RR111 Series TMR Analog Magnetic Sensors offer high sensitivity and an even smaller package size than previous TMR analog technologies.  (Read More)

Coto Awarded BEST OF SHOW Silver at Sensors Midwest!

Coto Technology has been awarded Sensors Midwest’s Best of Show “Silver” award for its newly released RedRock TMR RR121 Magnetic Sensor. (Read More)

RedRock TMR Product Launched in Europe

RedRock TMR Ultra-Miniature Switches & Sensors were Introduced to Europe at Electronica Germany  (Read More)

NEW App Note!

A critical component for good RF performance in a reed relay is optimized leads. Read about why leads matter in Coto’s newest App Note: “Leadform Follows Function in RF Reed Relay Design.”Optimized leads are critical for good RF performance.