SS421H HONEYWELL-ACC | Alldatasheet
Document overview
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- PDF pages: 5
Technical content
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 Potential Applications
- Under-speed detection for fans
- Conveyors
- Motor control
- Power-up fault failure filter in motor start-up
Description
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.
Product Type Hall-Effect Under-speed Detector IC Package Style Radial Lead IC Supply Voltage 4.5 Vdc to 16 Vdc Output Type Sink Termination Type PC Board Magnetic Actuation Type Bipolar Operating Temperature Range -40 °C to 105 °C [-40 °F to 221 °F] Storage Temperature -40 °C to 125 °C [-40 °F to 257°F] Output Voltage 0.4 Vdc max. Switching Time Rise (10 % to 90 1.5 µs max. Switching Time Fall (90 % to 10 1.5 µs max. Output Voltage Span (min.) 0.4 Vdc Operate Point 250 G Release Point -250 G Availability Global Supply Current (max. @ 25 °C) 15 mA Output Current (max.) 20.0 mA Operate Point @ 25 °C 25.0 mT [250 G] max. Release Point @ 25 °C -25.0 mT [-250 G] min. Leakage Current max. 10 µA Differential 5.0 mT [50 G] min. Series Name SS421 Supply Current (typ. @ 25 °C) 15 mA