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Have you ever seen a part that looks like this? - While looking for more info about this part, I came across a datasheet for NEC’s uPD65000¹ , a 3-micron CMOS Gate Array. Potentially, that means that the D54304 was from an earlier series of gate arrays, but I have yet to find a datasheet or other resource to confirm that 100%. The datasheet for the uPD65000 that I found is from 1985, so it's possible that the D54304 is even older. - The uPD65000 has a diagram that shows the rough layout for how the gate array is structured, and it’s very similar, if not identical looking to the D54304. The datasheet for the uPD65000 also describes how these parts would have been designed. They also boasted a 8-12 week turnaround time for custom gate-array masks. - In principle, there is a base template gate array that has all of the possible components placed. With the help of NEC’s CAD software, a custom mask would be created that connects or disconnects certain spots on the base template. This allows customs designs to be quickly and easily created, and I would assume that the CAD support made iterating through designs very simple. - As I mentioned in the previous Reel about this part, I used a burr-tipped insert for a Dremel. Instead of soldering the top metal lid to the ceramic body like in many other components, this part uses “parallel gap resistance seam welding” to secure the lid in place. The welder uses two tips that roll along the seam on opposite sides from each other, while passing a large current through the seam to weld it in place. - Sources: ¹ NEC D65000 Datasheet (PDF, alldatasheet) - #ComponentsCloseUp #electronics #technology #tech #techtok
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