VF401

The VF401 is a high performance, digital, 2-wire Magnetoresistive Sensor with a current output, designed for sensing fine pitch ring magnets. The unique VF401 bridge array (patent number 6,297,628) has been optimized to allow a greater air gap between the target and the sensor with reduced loss in sensor signal or accuracy. The VF401 has a reduced sensitivity to run-out (shift in sensor position relative to the inside or outside diameter of the ring magnet). It is also less sensitive to tilt tolerance (deviation from parallel positioning of the sensing elements and ring magnet), accepting up to 10°, versus only 2° to 3° for typical ring magnet sensors, as well as being less sensitive to twist (deviation of perfect angular position of the bridge runners relative to the pole transitions).

• Robust design, allowing use in potential applications with extreme temperature requirements
• Not damaged by reverse polarity voltages when customer-supplied sense resistor is installed
• Patented MR bridge optimized for stable sensing of 20- to 50-pole pair ring magnets
• 2-wire digital current output simplifies wiring and interfacing which can reduce total system cost
• Enhanced sensitivity, ±7 gauss typical, allows for larger air gaps (up to 2.5mm [0.098"])
• Higher pole density (up to 50-pole pairs depending on ring diameter)
• One pulse per pole pair output and differential bridge operation
• Wide speed capability provides application flexibility with true zero speed sensing
• Output pattern independent of gap between target and sensor

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