Epec's Blog | Electronics Manufacturing Solutions

Many applications would be better suited using a membrane switch (low profile, flat surface keypad assembly) along with a rigid printed circuit board (PCB), replacing screen-printed silver conductors on polyester sheets.

Printed circuit boards with gold plated switch contact pads and gold plated dome switches greatly improve the reliability of your application, offering longer operating life with lower switch resistance and contact bounce.

The smallest bend radius that can be used on a membrane switch tail will depend on the type of design. Deciding factors will depend whether or not the user interface is constructed with one tail/circuit layer or dual tail/circuit layers, and where the bend is located.

Overmolded cables are full assemblies that seamlessly combine the wire and the connector into a single part. The process of overmolding a cable involves injecting a molten material into a mold cavity, which conforms to the desired shape when cooled. The mold cavity can be built as a simple design with no markings or as a more complex design if you wanted to include a company name, corporate logo, flanges to be used as attachment points, or an extended strain relief area.

Custom low-profile keypad assemblies used in OEM applications incorporate snap-acting dome switches. Dome switches are a type of keypad assembly switch intended for very long cycle life and years of trouble-free use but are intended for logic-level switching, not power switching.