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Author Topic: lost in datasheets...  (Read 1502 times)

dodgy geezer

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lost in datasheets...
« on: June 05, 2012, 01:44:22 PM »

Ok, I give up.  Does ANYONE know the difference between an IRF540, an IRF540N and an IRF540A...?
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ACTion

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Re: lost in datasheets...
« Reply #1 on: June 05, 2012, 03:22:21 PM »

Ok, I give up.  Does ANYONE know the difference between an IRF540, an IRF540N and an IRF540A...?
Probably - but you won't find them working for International Rectifiers!
Dave M
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dodgy geezer

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Re: lost in datasheets...
« Reply #2 on: June 05, 2012, 03:47:40 PM »

This site seems to give a fair bit of info http://www.seekchip.com/icstock-index/IRF.html - but there are over 50 540 designations   {:-{
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malcolmfrary

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Re: lost in datasheets...
« Reply #3 on: June 05, 2012, 03:54:55 PM »

Different current carrying abilities at first glance.
irf540 = 15A at 100C continuous
ifr540a = 19.8A at 100C
irf540n = 23A at 100C
Probably several more differences in there tied up with how well the heatsink works, but if the basic 540 works, the others should be a drop-in replacement.  Although they might have a better performance, it could just be that demand for the higher performance variants results in bigger production runs and consequent fractionally lower prices to the general market.  
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dodgy geezer

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Re: lost in datasheets...
« Reply #4 on: June 05, 2012, 05:10:29 PM »

Thanks... I have a circuit specifying IRF540A, and, as far as I can tell, it's not made any more. So I looked for alternatives, but no one seemed to specify the N, which seemed to be common. And I couldn't tell why... 
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