TMR4001 TMR Gear tooth sensor with high sensitivity to magnetic field gradient
Part No.: TMR4001
Previous Part No.: MMG145F
Single / Double Full: Single Full
Supply Voltage (V): 0~7 V
TMR Element Spacing (mm): 0.25
Gear Tooth Pitch Range:

optimal pitch at 0.5mm

Resistance (kΩ): 15
Saturation Field (Oe): ±70
Sensing Direction: X-axis
Form Factor: LGA6L(3x3x0.9)
Lead Time: In stock
  • TMR4001

General Description:The TMR400X magnetic gear tooth sensors utilize a unique push-pull Wheatstone bridge design, including one or two Wheatstone full bridges, with four or eight unshielded high sensitivity TMR sensing elements. The Wheatstone bridge creates a differential voltage output with respect to the magnetic field gradient along the sensor’s sensitive direction. In the dual-bridge configuration, the two orthogonal Wheatstone full bridges provide sine and cosine voltage signals that can be used to measure both the gear tooth position and the direction of motion. The TMR400X magnetic gear tooth sensors offer superior performance with high sensitivity to the magnetic field gradient. They can detect very small changes in magnetic field, along with good temperature stability of the output signal.

The TMR400X magnetic gear tooth sensors are available in 8 different standard spacings of 0.25mm, 0.5mm, 0.75mm, 1.0mm, 2.0mm, 3.0mm,4.0mm,and 5.0mm. Three types of small form factor LGA packages are available. The package dimensions are 3mm × 3mm × 0.9mm, 3mm × 6mm × 0.9mm,and 3mm × 8mm × 0.9mm.


Features and Benefits:(1)Tunneling Magnetoresistance (TMR) Technology;(2)High Saturation Point Allowing Operation under Large DC Magnetic Field;(3)Wide Air-Gap Tolerance;(4)High Sensitivity to Magnetic Field Gradient;(5)Capable of Small-Pitch Gear Tooth Detection;(6)DC (Zero-Speed) Operation;(7)Sine/Cosine Signal Outputs with Precise Phase Shift;(8)Excellent Thermal Stability;(9)Good Immunity to Environmental Magnetic Field;(10)Compact Ultra-Thin Package.


Applications:(1)Gear Tooth Motion, Speed, and Direction Sensing;(2)Linear and Rotary Speed Sensing;(3)Linear and Rotary Position Sensing;(4)Linear Magnetic Scales;(5)Magnetic Encoders.



The information provided herein by MultiDimension Technology Co., Ltd. (hereinafter MultiDimension) is believed to be accurate and reliable. Publication neither conveys nor implies any license under patent or other industrial or intellectual property rights. MultiDimension reserves the right to make changes to product specifications for the purpose of improving product quality, reliability, and functionality. MultiDimension does not assume any liability arising out of the application and use of its products. MultiDimension’s customers using or selling this product for use in appliances, devices, or systems where malfunction can reasonably be expected to result in personal injury do so at their own risk and agree to fully indemnify MultiDimension for any damages resulting from such applications.

“MultiDimension”, “MultiDimension Sensing the Future”, and “MDT” are registered trademarks of MultiDimension Technology Co., Ltd.

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