Ultra-small magnetic sensors combine ruggedness and ease of use

Murata has reduced the size of its AS-M15xx-R Anisotropic Magneto- Resistance (AMR) switches to 1.0mm x 0.9mm x 0.5mm, delivering more compact and reliable alternatives to mechanical switches.

Compared to conventional switches used to detect opening and closing of doors, lids and enclosures in many types of equipment, magnetic switches are wear-free and easily sealed against contaminants such as water or dirt. These advantages extend lifetime, enhance reliability, and can simplify design for faster time to market and lower cost.

AMR switches also have advantages over Hall ICs, which are sometimes used for non-contact sensing. They display comparable sensitivity, can be used with thin magnets to save space, and also have a wider detection area. This enhanced detection allows more freedom when positioning the sensor, and also relaxes the need for precision alignment.

The standard sensitivity is 1.5mT, and switches are available to 3.0mT to satisfy a wide variety of applications. Each sensor incorporates the AMR element and a CMOS IC, and features bipolar construction enabling sensing to be independent of the magnetic pole.

 

FEATURES 1.8V supply voltage 1.6µA operating current Alternative packages: SOT23, SON4

APPLICATIONS Domestic appliances Security monitoring Safety systems Tamper detection

 

 

Murata / AS-M15xx-R