Honeywell SS421H

Sensors, Magnetic Position Sensors, PCB level Position Sensors (Miniature Plastic package)

Hall Effect Sensor; Operate Point Max:250G; Operate Point Min:-250G; Release Point Min:-250G; Supply Voltage Max:25VDC; Supply Voltage Min:-25VDC; Mounting Type:PCB; Polarization:Bipolar; Sensor Terminals:Through Hole ;RoHS Compliant: Yes

The SS421 Series Adjustable Hall-effect Under-speed Detectors are designed to monitor fan or motor performance. This temperature-compensated, Hall-effect IC contains a timing circuit and logic, that senses magnetic input frequency. The internal circuitry contains a timer so that one or two pulses at a slower repetition rate than the set point do not produce an unwanted output. A small amount of hysteresis has been built into the output so that operation right at the set point does not result in a chattering output. The user simply provides an external resistor and capacitor combination to select the RPM trip point that will fit the particular application.