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The working principle and advantages and disadvantages of the tact switch

The tact switch is an electronic switch, which can be turned on by lightly tapping the switch button during use. When the hand is released, the switch is disconnected, and its internal structure is realized by the force of the metal shrapnel to switch on and off.


Tact switches are widely used in household appliances due to their small size and light weight, such as: audio-visual products, digital products, remote controls, communication products, household appliances, security products, toys, computer products, fitness equipment, medical equipment, currency detector pens , Laser pen buttons, etc. But the tact switch also has its shortcomings: frequent pressing will cause the metal shrapnel to fatigue and lose its elasticity and fail. Therefore, the buttons of most electrical appliances are directly replaced by conductive rubber or metal shrapnel of the pot switch, such as computer keyboards, remote controls, and so on.


Advantages of tact switch:


The advantage of the tact switch is that it is suitable for high-density surface mounting, some can be cleaned after soldering, the sealed type can be dust-proof, and it is most suitable for harsh environments. Product life span ranges from 100,000 to 10 million times. The product has become a series. But the tact switch also has its shortcomings. Frequent pressing will cause the metal shrapnel to fatigue and lose its elasticity and fail. The light tact switch cannot produce function independently, and must be used in conjunction with the PCB circuit board to form a complete open control system.


Package type of tact switch


There are three kinds of packages for the tact switch: bulk manual plug-in, SMT chip package, and DIP plug-in taping package.


Tact switch pin connection


Regarding the pin connection of the five-pin tact switch: two pins are a group, four pins are for more stable soldering, and the fifth pin is for grounding.


Disadvantages of tact switch:


1. tacting the tact switch too frequently will cause its metal shrapnel to fatigue and lose its elasticity, which will cause the tact switch to fail. In fact, this is a common problem of electronic switches. Frequent use of any electronic components will accelerate aging.


2. In addition, the tact switch cannot produce its own function independently, that is to say, the tact switch needs other PCB circuit boards to cooperate with each other to form a complete switch control system.



Post time: May-31-2021

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