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I.C.-Based Potentiometer Switch

Mon, 02/11/2002 - 3:57am
Electro-Mech's new SW44109 Hall-effect potentiometer switch offers both rotary and digital regulation for maximum operation control in a compact size. A one or two sealed, Hall-effect integrated circuit combined with a 295° linear (S) taper potentiometer enables the user to specify a value so that at the push of a button, the circuit or channel automatically opens at the preset level.

Featuring a non-lighted momentary pushbutton switch, the SW44109 utilizes translucent knobs illuminated when used with an edge-lit panel. Typical applications for the SW44109 switch include industrial/avionics displays and audio controls, instrument panel controls, and other high-density panels.

Lightweight and compact, the new switch weighs less than one ounce and measures less than one square inch. The SW44109 requires only 2 inches of space behind the display panel and is easy to mount via a 1/4 inches diameter threaded bushing and hex nut. PCB interface is provided via front facing PC pins that plug into through-hole board circuitry, enabling board location immediately behind the display panel.

The SW44109 requires a 3.8-volt minimum supply voltage and 5 mA maximum supply current. Output leakage current is 5 μA maximum and potentiometer resistance is 100 K ohms ± 5%. Other features provided by the SW44109 include snap-feel momentary switching with an operating pressure of 35 oz. (± 5 oz.), plunger travel of approximately 0.060 inches, and a rated switch life of 100,000 minimum actuations.

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