Standex Electronics' GR150

DN Staff

April 10, 2010

1 Min Read
Standex Electronics' GR150

The GR150 is a normally open switch that closes whenproperly placed near a magnetic source. It consists of two magnetic members hermetically sealed in a glasscapsule, switching takes place in an inert environment. The small size and highmagnetic sensitivity makes the GR150 ideal for use in hearing aids, heartpacemakers, pill cams, cell phones and similar electronic devices. Hearing aids use the switch to automaticallyswitch the hearing aid to a mode (T-coil) that gives better performance whenthe end customer is using a telephone (which has a low-grade ceramic magnetlocated in the handset). The smallersize of the GR150 allows engineers more flexibility in the mechanical design ofminiature electronic devices. The availability of very tight ampere turn (AT)ranges allow the design engineer better control of the magnetic variables inhis design. The magnetic sensitivity ofreed switches is measured in Ampere Turns (AT) in a specified test coil. Unlikesome other magnetic sensors which have a power drain while in their off state,the GR150 consumes no power in the off state. The GR150 is just 3.7 mm inlength - the next largest magnetic reed switch available is approximately 10percent longer. Designs incorporatingsubminiature reed switches benefit substantially from a 10 percent reduction inswitch body length. Typical subminiaturemagnetic reed switches have a substantial spread in ampere turns (AT). As produced subminiature reed switchesnormally have a sensitivity range of 2 to 30AT. The unique GR150 manufacturing process is capable of an 80% processyield in a narrow 2AT band. This wouldmean that our manufacturing process is capable of giving us an 80 percent yieldin an AT range of 3 / 4AT.

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