Standex Electronics introduces the SR4J series of ultra small surface mount magnetic reed switches for non-contact position sensing in pill cams and other medical devices. Over molded around a proven GR150 magnetic reed switch, this J leaded version measures just 4.7 mm in length and 1.7 mm in height. The external leads of the reed switch form a tear drop terminal pad arrangement which preserves a greater portion of the initial magnetic circuit, thus enhancing the magnetic sensitivity of the sensor. The SR4J series boasts a maximum sensitivity range of 3/5 Ampere Turns (AT) (initial), and is available in a production range from 3 to 20 AT.

In addition to a small footprint and tight sensitivity range, the SR4J series is responsive, with a typical operating time of 0.2 milliseconds, and release time of 0.1 milliseconds (typical). The switches have a power rating of 1 VA maximum. A switching current (Max) of 0.05 Amp, DC is standard, as is a carry current rating (max) of 0.5 Amp, DC. Boasting an operating range of -40 to 125°C, the SR4J is well suited for use wherever small size and sensitivity are required for non-contact position sensing applications.

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