Magnetoresistive (MR) Sensors
Magnetoresistive sensors, also known as MR sensors, detects external electromagnetic fields. You can think of it as a kind of magnetic field sensor. They are very small, energy-efficient, and robust, which makes them ideal for use in places where energy supply is unstable. Magnetoresistive was discovered by Lord Kelvin in 1857, after he noticed that there was a small change in the electrical resistance of an iron positioned in a magnetic field. However, the concept of the first magnetoresistive sensor was only introduced in 1971. The earlier versions of MR sensors were simpler. Read More
A magnetoresistive sensor has a waveguide, which acts as its sensing element. Its other essential components include electronics, damping module, position magnet, and a strain pulse detection system. The round-shaped position magnet goes around the waveguide.
Magnetoresistive sensors use conductive materials like copper, aluminum, iron, gold, and nickel. These sensors can be applied in dynamic current measurements, contactless switches, path and angle management. MR sensors can also be used to determine magnetic fields.
Types
There are three types of MR devices: TMR (tunneling magnetoresistive), giant magnetoresistive (GMR), and anisotropic magnetoresistive (AMR).
- Tunneling magnetoresistive has the same structure with spin valves. The only difference is that instead of conductors, the former uses ultra-thin insulating layers for separating two magnetic layers.
Tunneling magnetoresistive technology is currently undergoing additional studies, particularly for use in advanced MRAM (magnetic random access memory) and hard disk read heads. - Giant magnetoresistive produces a 10% to 15% change resistance. Its ferromagnetic metals have two or more layers.
- Anisotropic magnetoresistive is found in ferromagnetic materials and relies on the angle between the magnetization direction and electric current.
Advantages
Magnetoresistive sensors are non-contact sensors. The position magnet and waveguide do not touch each other. Thus, they do not create friction and the operating cycles are not affected. There are no limits to the number of operating cycles created.
Parts from Magnetoresistive (MR) Sensors Category
PROGRAMMABLE ANGLE SENSOR, AMR, SIP; Magnetoresistive Sensor Technology:Anisotropic Magneto Resistive (AMR); Magnetoresistive Sensor Type:-; Supply Voltage Min:4.5V; Supply Voltage Max:5.5V; No. of Pins:3Pins; Sensor Case Style:SIP RoHS Compliant: Yes
SPEED SENSOR, AEC-Q100, 16V, SOT-477B; Magnetoresistive Sensor Technology:Anisotropic Magneto Resistive (AMR); Magnetoresistive Sensor Type:Bipolar Switch; Supply Voltage Min:4.5V; Supply Voltage Max:16V; No. of Pins:3Pins; Sensor RoHS Compliant: Yes
ANGULAR SENSOR, AEC-Q100, GMR, TSSOP-16; Magnetoresistive Sensor Technology:Giant Magneto Resistance Sensor (GMR); Magnetoresistive Sensor Type:-; Supply Voltage Min:4.5V; Supply Voltage Max:5.5V; No. of Pins:16Pins; Product Range:- RoHS Compliant: Yes
ANGULAR SENSOR, AEC-Q100, GMR, TSSOP-16; Magnetoresistive Sensor Technology:Giant Magneto Resistance Sensor (GMR); Magnetoresistive Sensor Type:-; Supply Voltage Min:-; Supply Voltage Max:-; No. of Pins:16Pins; Sensor Case Style:TDSORoHS Compliant: Yes
ANGULAR SENSOR, GMR, 5.5V, SOIC-8; Magnetoresistive Sensor Technology:Giant Magneto Resistance Sensor (GMR); Magnetoresistive Sensor Type:-; Supply Voltage Min:3V; Supply Voltage Max:5.5V; No. of Pins:8Pins; Sensor Case Style:SOIC RoHS Compliant: Yes
ANGLE SENSOR, AEC-Q100, GMR, 3.6V, SOIC8; Magnetoresistive Sensor Technology:Giant Magneto Resistance Sensor (GMR); Magnetoresistive Sensor Type:-; Supply Voltage Min:3V; Supply Voltage Max:3.6V; No. of Pins:8Pins; Sensor Case RoHS Compliant: Yes
GMR SENSOR, -40 TO 150DEG C; Magnetoresistive Sensor Technology:Giant Magneto Resistance Sensor (GMR); Magnetoresistive Sensor Type:-; Supply Voltage Min:4.5V; Supply Voltage Max:5.5V; No. of Pins:8Pins; Sensor Case Style:SOIC RoHS Compliant: Yes
ANGULAR SENSOR, AEC-Q100, GMR, SOIC-8; Magnetoresistive Sensor Technology:Giant Magneto Resistance Sensor (GMR); Magnetoresistive Sensor Type:-; Supply Voltage Min:3V; Supply Voltage Max:5.5V; No. of Pins:8Pins; Sensor Case RoHS Compliant: Yes
GMR ANGLE SENSOR, TSSOP ROHS COMPLIANT: YES
GMR ANGLE SENSOR, 5.5V, SOIC ROHS COMPLIANT: YES
GMR/AMR ANGLE SENSOR, -40 TO 125DEG C ROHS COMPLIANT: YES
TMR SENSOR, UNIPOLAR, 3.6V, SOT-23-3; Magnetoresistive Sensor Technology:Tunneling Magneto Resistance (TMR); Magnetoresistive Sensor Type:Unipolar Switch; Supply Voltage Min:2.7V; Supply Voltage Max:3.6V; No. of Pins:3Pins; MSL:- RoHS Compliant: Yes
TMR SENSOR, OMNIPOLAR, 3.6V, SOT-23-3; Magnetoresistive Sensor Technology:Tunneling Magneto Resistance (TMR); Magnetoresistive Sensor Type:Omnipolar Switch; Supply Voltage Min:2.7V; Supply Voltage Max:3.6V; No. of Pins:3Pins; MSL:- RoHS Compliant: Yes
TMR SENSOR, OMNIPOLAR, 3.6V, LGA-3; Magnetoresistive Sensor Technology:Tunneling Magneto Resistance (TMR); Magnetoresistive Sensor Type:Omnipolar Switch; Supply Voltage Min:2.7V; Supply Voltage Max:3.6V; No. of Pins:4Pins; MSL:- RoHS Compliant: Yes
TMR SENSOR, OMNIPOLAR, 3.6V, SOT-23-3; Magnetoresistive Sensor Technology:Tunneling Magneto Resistance (TMR); Magnetoresistive Sensor Type:Omnipolar Switch; Supply Voltage Min:2.7V; Supply Voltage Max:3.6V; No. of Pins:3Pins; MSL:- RoHS Compliant: Yes