Newsgroups: sci.electronics Path: utzoo!henry From: henry@utzoo.uucp (Henry Spencer) Subject: Re: Reliability: 54 vs. 74 TTL Message-ID: <1988Jun13.190154.854@utzoo.uucp> Organization: U of Toronto Zoology References: <5770009@hpscdc.HP.COM> Date: Mon, 13 Jun 88 19:01:54 GMT > ... If the ambient is say 69 degrees C, is a > 54XX logic IC more reliable because it has been "derated from > 125 degrees C" that a Commercial one that is only rated to go > from 0 to 70 degrees C? Let's assume both are in a frit seal > ceramic package so we are not confused with comparisons between > plastic and hermetic package reliability... My impression is that the difference between 54XX and 74XX *is* the packaging, period. I could be wrong. JANTX parts are a different story, of course. -- "For perfect safety... sit on a fence| Henry Spencer @ U of Toronto Zoology and watch the birds." --Wilbur Wright| {ihnp4,decvax,uunet!mnetor}!utzoo!henry