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???
09/05/10 13:35
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 		 #178452 - I think the "H" may be because it is 5A isnt it?
Responding to: ???'s previous message
Yes: if you look at catalogues, you will see that there are lots of 78x05 devices - where the 'x' indicates different current capabilities; eg,

LM78L05 - 100mA; http://www.national.com/pf/LM/LM78L05.html
LM78M05 - 500mA; http://www.national.com/pf/LM/LM78M05.html

Searching for 78H05 not! What strange! Fake IC?

Yes, it conceivable that you have a fake IC (especially as you've got it from a questionable source) - but it's far more likely that it's just a part that's no longer made by National Semiconductor


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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