SS421H Datasheet PDF - Honeywell

●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.

●Features:

● Wide Temperature Ranges for Design Flexibility

● Temperature Compensated for Consistent Operation with Low-Cost Magnets

● Bipolar Operation for Easy RPM Counting Using Ring Magnets

● Built-In Timing Circuit Greatly Simplifies and Reduces the Cost of PC Board Design

● Speed Trip Point Adjustable with External Resistor and Capacitor