The Microchip parts starting with "TC" are from an analog acquisition (Telcom). "PS" from Power Smart? New analog parts are "MCP" parts. We're all familiar with the PIC parts. Keeloq HCS parts - "Hopping Code ???" Where did the "AY" and "ENC" parts come from? http://biz.yahoo.com/bw/050425/255305.html?.v=1 Microchip Technology Announces World's Smallest Ethernet Controller, Offers Free TCP/IP Stack Optimized for Host PIC Microcontrollers Monday April 25, 8:01 am ET 10Base-T Stand-Alone Controller has SPI(TM) Serial Interface, Provides the Smallest Whole-Product Embedded Ethernet Solution CHANDLER, Ariz.--(BUSINESS WIRE)--April 25, 2005-- Microchip Technology Inc. (Nasdaq:MCHP - News), a leading provider of microcontroller and analog semiconductors, today announced the world's first 28-pin stand-alone Ethernet controller, which provides a low-pincount, cost-effective, easy-to-use solution for remote communication with embedded applications. Microchip's ENC28J60 Ethernet Controller enables designers to create network- and Internet-connected embedded applications with minimized board space, cost and complexity. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist