Dual-action feature on DT-Series tactile domes

15th March 2021
Alex Lynn

Snaptron has announced a new feature to its DT-Series, also known as dual-touch tactile domes. The DT dome is similar to a standard four-legged metal dome, except one foot is shorter. The new feature, called ‘Continuous Dual-Touch’, maintains two separate electrical contacts through two actuations in a single dome switch.

The DT dome can detect two different force levels or actuation positions. The first position provides no tactile sensation but makes electrical contact. While the second position makes a second electrical contact—giving the tactile feedback synonymous with traditional domes switches.

The Continuous Dual-Touch Feature, indicated by DTSD in the part number, takes this functionality a step further. Two dimples located on the short foot ensure that the dome maintains electrical contact through both actuations. DTSD domes are beneficial when the first actuation plays a critical part in the switch's full function; the second actuation is dependent on the first maintaining contact; or if both electrical contacts detect the state of a system.

"We are seeing designs getting smaller and more sophisticated," said Ashley Steinbach, Director of Strategic Development. "This is requiring engineers to do more with limited space, presenting the need for multi-functional components like the DTSD dome."

The DTSD dome also assists with off-center actuations while sustaining a consistent trip force. This design allows the first contact to work consistently, even when pressed at an angle or off-center.

DTSD domes come standard in 6, 7, 8.5, 10, and 12mm with forces ranging from 180 to 340g, depending on diameter, and life cycle ratings up to 5,000,000 cycles. All standard DTSD domes are nickel-plated.

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