Honeywell VF401 2-wire magnetoresistive fine-pitch ring magnet sensor

Manufacturer: Honeywell

The VF401 is a high performance, digital, 2-wire, MR (magnetoresistive) sensor in a miniature, flat, TO-92-style, plastic package 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.

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Features Applications Model Document

Robust design operating from -40 °C to 150 °C [-40 °F to 302 °F] can withstand short durations up to 175 °C [347 °F], allowing use in potential applications with extreme temperature requirements.
Not damaged by reverse polarity voltages when customer-supplied sense resistor is installed, enhancing protection.
Patented MR bridge optimized for stable sensing of 20- to 50-pole pair ring magnets with improved insensitivity to run-out, tilt and twist.
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 2,5 mm [0.098 in]) and higher pole density (up to 50-pole pairs depending on ring diameter).
One pulse per pole pair output and differential bridge operation allow compatibility with differential Hall sensors which can make it easier to upgrade existing applications.
Wide speed capability provides application flexibility with true zero speed sensing and operation up to 3000 Hz.
Output pattern independent of gap between target and sensor.
RoHS-compliant materials meet Directive 2002/95/EC.

Transportation

Speed encoding using a multipole ring magnet
Enhanced accuracy rotational position sensing
Wheel speed sensing
Window lift applications
Speed and direction sensing

Industrial

Shaft speed encoding using a multipole ring magnet
Enhanced accuracy rotational position sensing
Precision motor speed measurement
Speed control in machine tools
Elevator speed sensing
Speed control in motorized industrial equipment

Medical

Shaft speed encoding using a multipole ring magnet

Mfr. Part No.	Description
VF401	flat TO-92-style, 500 units/bulk

Honeywell VF401 2-wire magnetoresistive fine-pitch ring magnet sensor

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