ABLIC S-57W1/W2 Dual Hall ICs Simplify Motor Feedback in Space-Constrained Designs

Motor feedback systems often rely on two Hall sensors mounted 90 degrees apart to deliver both speed and direction information. It works, but it takes extra board space and complicates the layout, and every time the magnet pole count changes, the PCB usually needs to be redesigned.

ABLIC’s S-57W1/W2 addresses that problem with a single IC that integrates two Hall elements, each sensing magnetic flux in a different direction. The chip generates the required 90-degree phase difference internally, so designers can cut component count and streamline their layouts. It also helps with production consistency, since there is only one device to place and align.

Designed for Higher-Resolution Sensing

One of the easiest ways to get finer resolution from an encoder is to increase the number of poles on the ring magnet, but that also reduces flux density. The S-57W1/W2 tackles this with high magnetic sensitivity down to 0.8 mT (typical), allowing it to detect even very weak fields. That means engineers can use high pole-count magnets for precision feedback without sacrificing reliability.

Compact Size, Low Profile

Both a standard SOT-23-5 and a very low-profile HSNT-6 package are available, the latter measuring just 0.5 mm thick. For actuators where space is tight, such as power window motors or sunroof drives, that height saving can make mechanical design easier.

Built for Fast-Moving Motors

The S-57W1/W2’s typical output delay time of 8.4 µs gives it the responsiveness needed to track rapidly changing magnetic fields. In practice, this means fewer missed pulses and more reliable position control in high-speed systems such as sliding doors, liftgates, or rotary controllers.

Flexible Configuration Options

ABLIC gives engineers several ways to configure the device, with choices of rotation speed/direction or quadrature output types, XY/ZX/ZY axis detection, and open-drain or pull-up driver outputs. Three sensitivity ranges: 0.8, 2.0, and 6.0 mT, make it easy to tune performance for different motor and magnet designs without redesigning the board.

The company is also introducing the S-5791/92 for consumer products, carrying the same dual-Hall concept into applications like e-bike pedal sensors, power tools, and robotic vacuum cleaners.

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