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???
09/06/10 14:05
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 		 #178457 - from the days of burning your fingers
Responding to: ???'s previous message
it's far more likely that it's just a part that's no longer made by National Semiconductor
It is a chip from the days of burning your fingers on a "non-C" 8051 and a couple of "non-C" 8255s. In those days you had 5V consumption measured in amperes. I fail to see a modern design needing that amount of regulated 5V and thus it is no surprise it is discontinued.

a note to Chico: it is very possible that this chip has a minumum load, if you HAVE to use it put a heavy load resistor across the 5V. A much better solution: if you can not find a datasheet for the TO-3 versions, throw it away.

Erik



List of 21 messages in thread
TopicAuthorDate
LM78H05K Datasheet really exists?            01/01/70 00:00      
   Searching for Datasheets            01/01/70 00:00      
      photo            01/01/70 00:00      
         Yes, that's National Semiconductor            01/01/70 00:00      
            You are right again...            01/01/70 00:00      
               I think the "H" may be because it is 5A isnt it?            01/01/70 00:00      
                  from the days of burning your fingers            01/01/70 00:00      
                      I fail to see a modern design needing that amount...            01/01/70 00:00      
                        qualify            01/01/70 00:00      
                           Still need for power - but varying voltages and low loss            01/01/70 00:00      
                           12V the big favourite in a PC            01/01/70 00:00      
                     Killed off by switchers            01/01/70 00:00      
                        The heat was always a challenge with high-power linears            01/01/70 00:00      
                  Disapointed but clear.            01/01/70 00:00      
                     How so?            01/01/70 00:00      
                     You can make your own ...            01/01/70 00:00      
                        re: You can make your own            01/01/70 00:00      
                           Yes, they did, and those sheets were excellent!            01/01/70 00:00      
   the first mistake            01/01/70 00:00      
   Fairchild was the original manufacturer            01/01/70 00:00      
   these parts are hybrids ... so you can synthesize them            01/01/70 00:00      

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