Y Y TRI-STATE Outputs Direct replacement for AMD’s Am29821 Commercial 74F821SPC Military Package Number N24C Package Description 24-Lead (0 300 Wide) Molded Dual-In-Line 24-Lead (0 300 Wide) Ceramic Dual-In-Line 24-Lead (0 300 Wide) Molded Small Outline JEDEC 24-Lead Cerpack 24-Lead Ceramic Lea.