Andi Wardihan Sinrang, St. Fadhliah Yasmin, and Muh. Tahir

The is a unipolar Hall-effect switch sensor IC designed for position and proximity sensing in automotive and industrial environments. It operates from 2.5V to 24V DC, features a chopper-stabilized amplifier, and delivers an open-drain output. The “F1S4” suffix indicates a flat TO-92 package with 4 mm lead spacing and a temperature range of -40°C to +150°C.

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I regret to say that does not correspond to any known, publicly documented component, standard technical specification, product code, or academic reference as of my latest knowledge (including electronics, automotive, industrial machinery, HVAC, computing, or military nomenclature).

Often associated with 2017 manufacturing dates in many legacy units.