Honeywell SS443A TO-92S Package Sensor

Honeywell SS443A TO-92S Package Sensor Specifications Sensor Type: Unipolar Hall switch (triggers only with S-pole south) Package: TO-92-Flat-3 (TO-92S flat 3-pin, through-hole); SMD version: SS443A-S (SOT-89) Supply Voltage: 3.8VDC ~ 30VDC, compatible with 5/12/24V systems Quiescent Current: Typical 10 mA Output Type: Open-collector NPN output, requires external pull-up resistor; max sinking current 20 mA Response Frequency: Up to 20 kHz, suitable for speed counting and high-speed detection Operating Temperature: -40℃ ~ 150℃ (industrial high temp) Protection: Built-in reverse polarity protection; RoHS compliant Magnetic Switch Threshold (25℃) Gauss / milliTesla conversion: 1 mT = 10 Gs Operate Point Bop (magnet approaches, output pulled low): 110~180 Gs (11‑18 mT), typical 125 Gs Release Point Brp (magnet moves away, output returns high impedance): 75‑155 Gs (7.5‑15.5 mT), typical 90 Gs Built-in hysteresis prevents false triggering due to magnetic fluctuations Pinout (TO-92S flat, with printed side facing you, pins down, left to right) Pin1: VCC +3.8-30V Pin2: GND Pin3: OUT (open-collector output) ⚠️Important: Pin3 is open-collector and cannot directly connect to MCU IO; an external pull-up resistor (1k-10k) to IO supply is required. Operating Logic No magnetic field / N-pole nearby: output is high impedance (pulled high with resistor) S-pole magnet strength above Bop: output pulled to GND (low) Magnetic field drops below Brp: output returns to high impedance / high Typical Applications Speed detection, motor Hall speed measurement, gear counting Magnet proximity detection, limit switches, door sensors High-temperature position sensing in industrial equipment; magnetic detection for 12V/24V devices Quick identification within the same series Honeywell SS443A TO-92S Package Sensor