S331T is a tactile switch made by NKK Switches. It is a 2-pin, surface-mountable switch with a snap-action mechanism. The switch is rated for 5mA at 6VDC and is designed for use in membrane keyboards or low-current logic switching applications. The switch has a contact pathway of 0.25mm and a maximum travel of 0.7mm. It is available with a variety of actuator options, including black, red, yellow, white and grey. The height of the switch is 4.4mm and the operating temperature range is -40 to 85 degrees Celsius.