TMR4101 magnetic scale sensor 
The TMR4101 magnetic scale sensor is designed for consumer electronics and industrial applications, including camera autofocus and zoom, micron-level displacement measurement, linear and angular position measurement, and magnetic encoders. It operates in conjunction with a multi-pole magnetic scale with a 0.4mm magnetic pole pitch. As the sensor moves along the magnetic scale, its two push-pull TMR half-bridge structures output sine and cosine signals with a 90° phase shift. The signal period corresponds to the 0.8mm length of a pair of adjacent north and south poles.

Featuring excellent signal sensitivity and low noise thanks to MDT’s unique TMR technology, the TMR4101’s differential gradiometric sensor design provides high immunity to stray field interference. The TMR4101 supports temperature-compensated precision measurement capabilities that effectively negate temperature impacts on measurement accuracy by calculating the position through both sine and cosine signals with identical temperature characteristics. MDT also offers high-precision 0.4mm pole-pitch magnetic scales to complement the TMR4101, with the length and width of the magnetic scale customizable according to application requirements. In typical applications, the combination of the TMR4101 and magnetic scale can achieve a repeatability precision within +/-1 micron.

Key Features of TMR4101:

• Consistent micron-precision in unrestricted linear displacement ranges
• Stable signal output with large tolerance to mechanical alignment and air gap
• High immunity to stray field interference
• Support for temperature-compensated precision measurement solutions
• Ultra-thin DFN4L package (1.32mm×0.66mm×0.3mm) suitable for space-constrained applications such as smartphone camera modules
• RoHS/REACH compliance

Applications

• Camera Autofocus System
• Gear motion speed and direction detection
• Linear and angular velocity sensing
• Linear and curved displacement measurement
• Magnetic scale and magnetic encoder

Follow us on:

• Facebook
• LinkedIn
• twitter

MultiDimension Technology(MDT®) is a leading supplier of magnetic sensors specializing in Tunneling Magnetoresistance (TMR) technology. The company offers high-quality TMR magnetic sensors and system solutions for industrial and consumer sensor applications. MDT has corporate headquarters in Zhangjiagang Free Trade Zone, Jiangsu, China, with branch offices located in San Jose, CA, USA and Shanghai, China. MDT owns a unique portfolio of intellectual properties and state-of-the-art manufacturing facilities that support volume production of high-performance, low-power and low-cost sensors to satisfy the most demanding customer needs. Led by its founding team of elite experts and veterans in magnetic sensor technology and engineering services, MDT is committed to creating added values to its customers and ensuring their success.