Application notes and selection know-how across automotive, robotics, industrial and consumer electronics — each note explains the pain point, the recommended device set and the key implementation points. Updated continuously.
FAQ
Selection FAQ
Latching typerequires alternating N and S poles across the sensing face, output follows the pole transition, suited forContinuous pulse, commutation, direction detection scenarios (BLDC commutation, travel counting);
Unipolar typeResponds to a single pole only, switching on approach and departure — suited to position detection. Rule of thumb: choose latching for pulse trains, unipolar for a simple switch signal.
Bop (Operate Point) is the magnetic flux density that switches the output, Brp (Release Point)is the level at which the output recovers; the difference between them is the hysteresis. In magnetic design, the field strength at the working air gap must satisfy:
On approach Above Bop (reliable switching), and when moving away Below |Brp| (reliable release), with margin reserved for temperature drift and magnet tolerance. Call us for magnetic circuit and device matching support — we will run the numbers with you.
The conventional approach is "Hall + local PCB + 3 or more wires";PCB-Less Current OutputDevices (such as SC25898 / SC25896) merges supply and signal onto two wires,
Encoding the magnetic state in current level eliminates the internal PCB and excess harness, connecting directly to the ECU current-sensing input —door locks, window lifts and other long-harness, space-constrained actuatorsDelivers the clearest cost reduction.
Load-dump transients on a 48V bus far exceed 48V, so the rating must be evaluated against the system specification. If you wantDirect supply, no step-down stage needed, ultra-high-voltage parts are available — such as
SC2919: Operating Voltage 4.0~125V and voltage rating 250V, designed for direct supply in 48V vehicle systems; it can also work with an LDO/DC-DC step-down approach — we will compare both against your electrical architecture.
Typically 3 latching Hall devices at 120 electrical degreescompletes three-phase commutation; if you also need Direction Detection, two phase signals are enough to determine direction, and pulse counting can be reused for speed/travel measurement.
Single-phase brushless (e.g. fans) needs only one commutation Hall device. Fan applications also need attention to the effect of chopping frequency on audible noise.
No matching application?
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