High temperature and short leadtime benefits of platform crystal oscillator structure source: KYOCERA AVX The KYOCERA AVX platform structure is a structure with excellent junction reliability, and this is one of the features of this product.įigure 10. We can confirm that there are no cracks on the solder joints inside our product. This design increases the strength of the joints.įigure 7 shows a cross section of the relevant area. In addition to that, the components are filled with epoxy resin between the ceramic package and the substrate. The ceramic package and glass epoxy substrate are electrically and mechanically connected by solder. The junction of KYOCERA AVX ceramic package and glass epoxy board is also shown in Figure 3 – highlighted area on right. In the case of the platform structure, no stress is applied to the solder joint because the thermal expansion coefficient of customer’s board and KYOCERA AVX oscillator glass epoxy substrate are the same.Īs Figure 6 shows, we confirmed there were no cracks in the joint even at 1,000 cycles at -55° ~125° C. This may lead to solder joint crack as shown in Figure 5. Thus, residual stress remains on the solder joint which may result in cracks on the solder joint. ![]() In the case of a cold shock, such as a TCT test, the conventional product structure requires direct solder-joining of the ceramic package, so the thermal expansion coefficient of the ceramic and customer’s PCB is different. Ceramic Package solder joint crack example Compared with conventional products, this structure enables major components of all sizes to be consolidated into a single size, making it possible to use common materials, resulting in shorter lead times.įigure 5. By mounting this head unit on a 2016 ~ 7050 size glass epoxy board, the physical size of the component itself is adjusted. ![]() The platform structure consists of a head unit which is a standard 2016 size Crystal Unit using 2016 size ceramic package, crystal blank, IC and LID as the main components that control product characteristics. This has been one of the challenges of conventional oscillators.įigure 2 is KYOCERA AVX‘s unique platform structure. For example, in the case of size 7050, we had to prepare different materials for each product size, such as a ceramic package of size 7050 and a quartz blank suitable for that size, or a package and blank of that size for a smaller size 2016. In general, for each product size, the main component (Ceramic Package, Crystal Blank, IC, LID) must be prepared, and each size has a different design. First, Figure 1 shows the structure of a conventional, typical clock oscillator, with examples of the large size 70 on the left and the small size 2016 ~ 3225 on the right. This section describes unique platform structure for clock oscillators. Crystal Oscillator with Platform Structure In addition, in the network market, the number of crystal devices is increasing along with the further increase in the speed of communication devices, as well as the increase in the frequency and precision.
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