I would like to know if any drop-in replacements are released for the following parts mentioned below

Hi Sai Ravi, Good day. You're right! Listed parts was discontinued according to PDN1709 and PDN1619. https://media.digikey.com/pdf/PCNs/Altera/PDN1709.pdf https://media.digikey.com/pdf/PCNs/Altera/PDN1619.pdf Since MAX 3000A, FLEX 6000, FLEX 8000 and FLEX 10K devices are mature devices, you're recommended to use the newest CPLD devices for your design. https://www.intel.com/content/www/us/en/products/programmable/max-series.html At the meantime, you can subscribe to our customer notification mailing list at below link so that you can be notified when an Altera device is going to be discontinued. https://www.intel.com/content/www/us/en/programmable/support/quality-and-reliability/pcns-and-advisories.html#pdn Thank you.