Murata has launched surface mount Y1 safety certified ceramic capacitors suitable for AC-DC switching power supplies where a low-profile is needed. Applications of the new DK1 series include compact AV equipment, LED illumination, or 1U rack mounted equipment.
New capacitors meet the requirements of IEC 60384-14, an international standard that regulates the withstanding pressure and combustion resistance of capacitors connected to commercial power supplies from the standpoint of preventing fires and electric shock from electrical leakage.
Safety certified capacitors are placed at a power line input side in order to eliminate noise that builds up primarily in commercial AC power lines.
Murata explained that safety certified capacitors are usually of the lead type, but the mounted height above the board surface is a problem because it hinders efforts to make low-profile devices and it limits component layout.
In addition, because lead type capacitors are through-hole mounted, the lead wires are exposed on the underside of the circuit board. A fixed amount of insulating distance between the exposed lead wires and the metal components of the device is required by safety standards, so this complicates spatial layout within a device.
In order to eliminate such problems, Murata designed these new capacitors which use a structure of plate-shaped terminals on a disc-shaped ceramic dielectric placed within a plastic mold to reduce the terminal thickness that is present with lead type capacitors, and this results in a mounted height of 2.5mm or less for the product.
Furthermore, Murata stated that the component format enables reflow surface mount, and there is no longer a need to assure insulating distance at the underside of the board. This advances profile reduction for power supply devices subject to size limitations in the above stated applications for which spatial design has been difficult.
Mass production of the capacitors began in May 2017. Full Press release can be found here.