Overview

Murata Manufacturing Co., Ltd. has commercialized a magnetic switch ideal for open/close detection for mobile phones, note-size PCs and digital cameras, etc.
By using Murata’s own circuit design technology we have been able to reduce both the size and cost. A comprehensive lineup of this product, encompassing high and low sensitivity models, can accommodate a wide range of technological requirements.
In addition to industrial standard packages such as SOT23 and SON4, we have also developed an ultra-small size package at 1.0x0.9x0.5mm to help make overall packaging smaller and with a lower-profile.

Background

Until now, mechanical switches have been used for open/close detection for mobile phones and note-size PCs; however recently, magnetic switches and magnetic field sensors have been gaining popularity. Unlike their mechanical counterparts, magnetic switches eliminate wear caused by contact between sensor and magnet making it more reliable. Additionally, magnetic switches make it possible to design water-tight products with the switches being protected from the outside elements.
Demand for magnetic switches is projected to accelerate as equipment manufacturers adopt magnetic switches in applications that have utilized mechanical switches in the past.

Features

• Sensor IC incorporating both AMR (Anisotropic Magneto Resistance) element and CMOS IC
• Wide range of sensitivities in the product lineup (Standard sensitivity 1.5mT, high-sensitivity 0.5mT and low-sensitivity 3.0mT)
• Available in an ultra small size package at 1.0x0.9x0.5mm in addition to SOT23 and SON4
• Bipolar (N-pole or S-pole) detection type
• Low power consumption (1.6μA/1.8V)

Applications

• Open/close detection for mobile phones, note-size PCs and digital cameras
• Open/close detection for household appliances including refrigerators and washing machines
• Open/close detection for security equipment including door security

Part Number

• Product part number listing
  
  

  Part Number	Size	Sensitivity	Driving voltage	Consumption current
  AS-M15TA-R	2.9x2.8x1.2mm (SOT23)	1.5mT	1.6-3.5V	1.6μA
  AS-M15TB-R	2.9x2.8x1.2mm (SOT23)	1.5mT	3.6-6.0V	4.7μA
  AS-M15NA-R	2.0x2.1x0.6mm (SON4)	1.5mT	1.6-3.5V	1.6μA
  AS-M15XA-R	1.0x0.9x0.5mm	1.5mT	1.6-3.5V	1.6μA

Characteristic chart

• Timing chart

External Size

• AS-M15XA-R

Production

Mass production begins in 2008.

Sample Price

35YEN per unit

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