Metal dome membrane switch

Source: FLEXKYS Editorial Office Release time：2022-08-31 16:53 Click：

(Equipped with a unique four-legged shape, these innovative dome switches offer enhanced durability, reliability and versatility while maintaining exceptional tactile feel for single or double-sided printed circuit boards, flex circuits, and membrane switch panels. Offered in Mini (.331” Dia), Compact (.394” Dia) and Maxi (.480” Dia) styles with trip forces from 7.8 oz. to 14.8 oz.)

Construction of metal dome membrane switch and its circuits design

Working principle of Metal Dome Membrane Switch

The deformation of the metal dome causes the connection of anode and cathode when press the key. That is how the switch work.

(They function in the following way: The metal domes are placed on the printed circuit board by means of pressure-sensitive adhesive tape. In their relaxed state, the metal domes rest on the outer rim of the primary pathway. When pushed, the domes collapse and make contact with the secondary pathway, thereby closing the circuit.)

Common shapes of metal dome and its specifications

ID	Type	Size	Force
1	Four legs	6mm,8.4mm,10mm, 12mm,16mm,20mm.	180g,200g,250g,280g, 300g,350g,400g,450g,600g.
2	Four legs with hole
3	Triangle
4	Round

Four legs: Four leg series metal domes (4-leg tactile metal domes, cross metal dome)

1 2 3 4

Four legs with hole:

Triangle: (triangle tactile metal domes)

Advantages of metal dome membrane switch

Multiple shapes can be applied to different custom designsMeal dome is contact well and low resistanceStable form assure the same key pressure on multi-button panel.

Distinct hand feeling give clear feedback when pressing.

(These snap action switches provide positive feedback with an audible and tactile click.)

Electrical Performance

Item	Data	Item		Data
1.Wire Resistance	0.5mm width,<1Ω/cm		2.Rated Current	25-200mA,0-30V DC
3.Insulation Resistance	>100MΩ 250V DC		4.Working Voltage	<50V DC
5.Working Life	>0.5 million times		6.Working Temperature	-30℃-50℃
7.Working Humidity	40℃,98%RH No Influence		8.Feed backTime	10ms