Hall-Effect Vane Switch
q Contactless switch with open collector
output (40 mA)
q Static switching
q High switching frequency
q Hermetically sealed with plastic
q Unaffected by dirt, light, vibration
q Large temperature and voltage range
q Integrated overvoltage protection
q High interference immunity
q Integrated capacitors for EMI protection
The Hall-effect vane switch HKZ 121 is a contactless switch consisting of a monolithic
integrated Hall-effect circuit and a special magnetic circuit hermetically sealed in a plastic
package. The switch is actuated by a soft-iron vane which is passed through the air gap
between magnet and Hall sensor.
The main application field is in cars, i.e. as a breakerless trigger in electronic ignition systems.
Numerous industrial applications can be found in control engineering, especially in those areas
where switches must operate maintenance-free under harsh environmental conditions (e.g.
rpm sensor, limit switch, position sensor, speed measurement, shaft encoder, scanning of
coding disks, etc.).