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I'm hunting down a socket for a PLCC-84 chip and none of them mention pitch spacing. Is that because PLCC is always the same spacing between pins?

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Well, according to this article, yes:

"The PLCC utilizes a "J"-lead with pin spacings of 0.05" (1.27 mm)."

Which is confirmed by this page: the JEDEC standard for PLCC is "1.27mm (50mil) lead pitch".

I did a quick search at JEDEC but only found specification for trays and tubes.

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    \$\begingroup\$ Also confirmed in this book. The next page[s] also gives the standard dimensions for the package[s] (square and rectangular). \$\endgroup\$ – Fizz Oct 21 '15 at 8:36

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