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Dome switch touts higher tactile ratio

Posted: 08 Aug 2006 ?? ?Print Version ?Bookmark and Share

Keywords:Snaptron? WT04170? tactile dome switch?

Tactile dome switch

Meeting industry demand for smaller tactile dome switches, Snaptron Inc. claims to offer the smallest 3-leg dome switch with the 4mm WT04170 series.

Historically, 4mm and smaller domes are round in shape. The advantage of the 3-leg dome is it allows for a higher tactile ratio to be achieved, giving the switch a more crisp "snap" feel, said the company. For example, Snaptron offers a round 4mm dome that has a tactile ratio between 30 percent and 45 percent, however, the WT04170 has a much higher tactile ratio of between 60 percent and 75 percent. Another advantage of the 3-leg design is it allows the domes to fit closely to each other and other components for applications where board space is limited.

The WT series domes are constructed of stainless steel. Key specifications include a switching voltage of .1-50Vdc, a switching current of .005-100mA DC, and a switching capacity of 1W. The dome offers 170g of force and is specified to 500,000 cycles. The operating temperature range is -45C to 100C.

The WT series domes can be used anywhere a momentary switch with tactile feedback is required. This includes PCBs, flex circuits and membrane applications. Typical applications include automotive, portable communications, discrete switch, qwerty keypads, medical devices, instrumentation controls, computer/peripheral and consumer electronics.

Snaptron also plans to release two domes to accompany the WT04170. These are the WTD06540 (3-leg, with dimple, 6mm, with 540g of force) and the WTD07500 (3-leg, with dimple, 7mm, with 500g of force). Both of these products will be available this month.

Pricing for the raw dome is 10.2 cents in quantities of 100,000. Delivery is from stock to two weeks.

- Gina Roos
eeProductCenter




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