OKI Circuit Technology has announced that it is preparing to ship the world's most multilayer printed circuit board. Each square meter of such a 124-layer board for chip assembly costs over $4,800. The unique solution is designed to test multilayer HBM memory and AI accelerators even before dividing into individual crystals - right on the Wafers . Den dyra och nischprodukten kommer också att vara efterfrågad inom luftfart och rymdelektronik .
To date, the absolute record is considered to be the production of a printed circuit board with 129 layers, which was manufactured by Denso back in 2012. OKI has not broken this record, but claims that the Denso product is extremely complex and extremely expensive, which does not allow us to talk about its commercial availability. In contrast, OKI Circuit Technology's 124-layer board is a commercial product that will be available i höst .
Before the 124-layer process technology was available, the industry was producing boards with a maximum of 108 layers. OKI has increased this figure by 15%, which can be considered a significant achievement. HBM chips and AI accelerators are becoming faster and more complex, which makes it difficult to initially validate them before installing them on production boards. Den ökande tätheten av signallinjer leder till övergång, vilket försämrar signalkvaliteten och gör det svårt att testa .
There are many factors that prevent simply increasing the number of layers in boards, such as resin delamination during molding, damage to through-holes, and difficulties in layer alignment. In particular, it takes 16 weeks to produce a new 124-layer board with a standard thickness of 7.6 mm. At the same time, up to 35% of the products are avvisade, vilket är betydligt högre än 15% i produktionen av 108- skikttryckta kretskort. Det är inte förvånande att kostnaden för en kvadratmeter av en 124- skiktskiva når $ 5, 000.
For this money, the company promises the highest thermal stability. With more than 1,000 thermal cycles, such boards are theoretically capable of withstanding extreme environmental conditions while maintaining electrical integrity. This quality is especially important for the aerospace industry - both in civilian and military projects. For comparison: mass-produced printed circuit Brädor innehåller vanligtvis inte mer än 15-20 lager . mot denna bakgrund, 124- Lagerbrädor ser verkligen ut som ett konstruktionsarbete .
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