MG Series Magnets DatasheetMG Series Magnets The MG Series magnets offered by Honeywell Sensing and Control includes several bar magnets in various sizes and strengths for actuating Hall-effect and magnetoresistive sensor ICs. These bar magnets are for use in sensors with unipolar or omnipolar magnetic characteristics. Made from different magnetic materials and available in a variety of sizes and shapes, the MG Series magnets can be used for evaluation and design of magnetic systems, and in numerous potential applications across a variety of different industries. Some of these magnets are offered with threaded bushings for easy installation and have a good resistance to demagnetization which could be caused by magnetic shock. These magnets are designed to provide minimum magnetic fields at a specified distance to help system designers match the appropriate magnet to their requirements. Value to the Customer Variety of sizes, shapes, and packaging options to choose from The MG Series consists of a range of magnets based on varying dimensions and packaging types to help customers identify the most appropriate magnet that can be used to evaluate Honeywells Hall-effect and magnetoresistive sensor ICs in their applications. DID YOU KNOW Magnetic sensing characteristics of Hall-effect sensor ICs are specified within particular ranges. For example, assume an application with a temperature range of -40 C to 125 C -40 F to 257 F using an SS443A. The operate point may be up to 215 Gauss 21.5 mT and the release point may be 60 Gauss to 190 Gauss 6.0 mT to 19.0 mT . To ensure reliable operation, at least 215 Gauss 21.5 mT must be presented to the sensor. For a robust activation, the flux from the magnet at the maximum operating gap should be 20 % to 100 % higher than the sensors maximum operating point over temperature. The Gauss level must then be reduced below 60 Gauss 6.0 mT to ensure that the sensor will release. Therefore, it is necessary to know the flux density (Gauss) measured at the chip to be able to: Select a device with the best magnetic characteristics for the application Select the best magnet Verify the desired mechanical characteristics COMPACT SIZE WIDE RANGE VARIETY OF SHAPES sensing.honeywell.com 2