Besides Micron Size and Vcc differences, are there any differences in these 3 PIC chips? (Want to migrate one device from a '54 to any cheaper, SOIC or SSOP part.) Mark -- Detest spam? Take the Boulder Pledge, boycott SPAMmers. http://www.zdnet.com/yil/content/mag/9612/ebert9612.html -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics