Sovier/Russian 132-pin PGA Ceramic IC Packaging
Rice43 at btinternet.com
Tue Feb 9 11:45:58 CST 2021
Though i’m no expert, it looks like those are more an artefact of production, rather than usable test points. It seems like those pins extend throughout the ceramic substrate, and were most likely produced by pushing the pins through holes in the substrate and then soldering them. This may have been a solution used when the factory making them had limited tooling, or the chip was particularly low volume and more dedicated tooling was uneconomical.
> On Feb 9, 2021, at 10:27 AM, Paul Birkel via cctalk <cctalk at classiccmp.org> wrote:
> In item https://www.ebay.com/itm/265045229011 I am curious as to whether the
> gold islands on the top-side are functional test-points giving electrical
> access to the underside pins? Was there a clip designed to attach to the
> top-side of these chips for use in circuit analysis? Was this design unique
> to Russian manufacture (I don't recall ever seeing this design previously)?
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