VM721D1 Anisotropic magnetoresistive (AMR) speed and direction sensor IC, 2-pin SIP, 500 units/bag.

The VM721D1 Anisotropic Magnetoresistive (AMR) 2-Pin Pulse Width Modulated (PWM) Speed and Direction Sensor Integrated Circuit (IC) is designed to detect the speed and direction of a ring magnet encoder target using a unique (patent pending) bridge design. The frequency of the digital supply current is proportional to the rotational speed of the target, and the rotational direction is encoded by modulating the pulse width of the supply current. The sensor IC works over a wide range of speeds, temperatures and air gaps.

Value to Customers

The VM721D1 sensor IC has a higher sensitivity AMR bridge array that operates with a larger airgap than Hall-effect sensor ICs, which allows for enhanced design flexibility and assembly tolerances. The sensor IC has been optimized to provide an output that is not affected by target runout or sudden air gap changes. It is insensitive to magnet pole size, allowing one sensor to be paired with different ring magnets. The VM721D1 sensor IC contains an integral capacitor for EMC protection, eliminating the need for an external capacitor in most applications. The wide leads are designed for a welded assembly, making the part easier to mount in customer applications.


Honeywell’s unique solution utilizes the AMR bridge in saturation, which provides a more stable output response when the system has vibration, sudden air gap changes, or target runout without requiring complex magnitude compensation algorithms. The AMR signal has greater sensitivity than Hall-effect sensor ICs, and does not require automatic gain control or chopper stabilization that can lead to increased jitter over the operating range.

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