Sound Components (Buzzer)Pin Type Piezoelectric Sounders: Request to Use One-sided Boards

If you use a two-sided through-hole board instead of a one-sided board, the rear cover or the fixing points of the pins are likely to become deformed,resulting in poor contact or an open circuit, which in turn may result in reduced sound volume or no sound at all.

In the case of the PKM13EPYH series, the pins are formed to specified dimensions and are fixed to the rear cover. The springiness of the pins is utilized by pressing the end of each pin against the piezoelectric diaphragm to ensure reliable electrical contact. The fixing point of each pin is made of plastic.

In the case where the product is mounted on a two-sided through-hole board, and then soldered in place, the molten solder will flow through the through-hole and reach the rear cover. Due to the heat of the molten solder, the possibility of deformation of the rear cover and the pins' fixing points will increase.
If the fixing points of the pins becomes loose, as a result of deformation, the pins will move and lose their springiness preventing them from being pressed firmly against the diaphragm.