Coto TMR Sensor - What is TMR?

Posted on Friday, September 29th, 2017

Coto Technology Provides General Overview of RedRock TMR Magnetic Sensors

Coto Technology Switch/Sensor Product Line Manager, Tanios BouRamia, explains TMR (Tunneling Magnetoresistance) sensing technology and how it works. A demonstration of TMR in featured, using an evaluation demo board and Coto’s RedRock TMR magnetic sensors. RedRock is the world's highest performing product line of TMR magnetic sensors with the lowest power consumption, highest sensitivity at the smallest size.

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What Exactly is TMR? Video

RR110 Analog Sensor                
- Highly sensitive
- Stable temperature performance
- Resistance changes linearly with magnetic distance
- Resistant to mechanical stress

RR120 Digital Sensor
- High sensitivity
- Low power consumption
- High frequency
- Logic output for design flexibility

RR130 Digital Switch
- High sensitivity
- Low power consumption
- High frequency
- Open drain MOSFET for design flexibility

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New CotoMos® Short Form Catalog

Posted on Friday, June 9th, 2017


Please download the newest version of the CotoMOS® Shortform Catalog.  The products are now grouped by application or featured characteristic - so it's EASIER than ever to choose and/or recommend CotoMOS® MOSFET relays.

12 Product groupings include: Automotive, Fast Switching, Form B, Form C, High Current, High Temperature, High Voltage, Low Leakage Current, Telecom, Low Capacitance and General Purpose.

Click here to download your copy.

For All CotoMOS
® part numbers.

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Therm-O-Disc’s G4 257C Microtemp® Thermal Fuse - Highest Open & Hold on the Market

Posted on Monday, June 5th, 2017

Hold Temperature (Th) of the industry leading MICROTEMP G4 257C has been increased to 220ºC to ensure applications with higher normal ambient temperature requirements will have added assurance of maintained operation for a minimum period of 168 hours without opening, as tested per IEC 60691. 

Features Include:

  • Holding Temperature - 220C - Industry Leading
  • Agency Approval - UL, VDE, CSA, CCC
  • Evaluated in laboratory conditions to maintain continuity for 1,000 hours at continuous thermal fuse body temperature of 220C.


See all Therm-O-Disc Products

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Using the RedRock™ TMR Magnetic Sensors RR120/130 for Speed & Direction Estimation in Rotating Systems

Posted on Friday, June 2nd, 2017

This application note discusses the use of TMR magnetic sensors in rotating systems where speed and direction of rotation are the bases for measurement. Such applications would include utility metering, motor position and other indexing applications, where the turn of a shaft is directly related to a quantity to be measured.  

See the RR110 specification

Please see the complete Application Note

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Interfacing the Coto Technology RedRock RR110

Posted on Thursday, May 4th, 2017

Interfacing the Coto Technology RR110 to an ADC using a low power analog interface circuit.

Background Portable medical devices, such as personal insulin pumps, have gotten smaller with time, allowing them to be conveniently carried by the user. This convenience has been made possible by intelligently and accurately dispensing product when active, and ensuring very low quiescent current when not active. Sensing technologies used to monitor the position of the plunger, therefore, need to be accurate in order to ensure the correct dosage, while being extremely frugal on power demand in order to fit within the operation profile of the device with the chosen battery. The RR110 analog sensor – from Coto Technology’s RedRock Series sensor product line – has high sensitivity and operates with ultra-low current, making it ideally suited for these applications. The RR110 is a two-terminal, passive analog magnetic sensor based on the Tunneling Magnetoresistance (TMR) principle. Resistance of the Magnetic Tunneling Junction (MTJ) changes from approximately 65kΩ with zero magnetic field, to approximately 40kΩ in the presence of ~10mT magnetic field and can be used reliably with a current as little as 1mA to measure the resistance change as a change in voltage. 

See the RR110 specification

Please see the complete Application Note

Contact Us for more information.

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