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Old 16th December 2009, 02:37 PM   #1
damage is offline damage  United States
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Default punch 150hd PS fets

Can I replace the 6 ss264 with 4 irf540n or irf540? If not, what is the best substitute?
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Old 16th December 2009, 05:09 PM   #2
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For the power supply, an IRFZ44 would be a better sub than the IRF540.
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Old 16th December 2009, 07:43 PM   #3
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Should I use 4 or 6? It seems with the much higher current rating I could use 4.
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Old 16th December 2009, 07:51 PM   #4
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Use 6.
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Old 16th December 2009, 08:07 PM   #5
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ok thanks!
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Old 18th December 2009, 12:06 AM   #6
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Do I replace the BUK455 outputs with IRF540?
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Old 18th December 2009, 12:17 AM   #7
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The IRF540 is rated for less current but is likely a good sub. If you're ordering the FETs from Mouser, order the IRF540A.
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Old 18th December 2009, 12:32 AM   #8
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I have some IRF540Ns. Those seem to be working. However, I see the BUK455 is rated at only (100A) 18A@100* while the IRF540 is rated 20A@100*.
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Old 18th December 2009, 12:43 AM   #9
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This is the datasheet I referenced. Maybe the FETs are not the same. You didn't have the -100a in the previous post.
http://datasheet.octopart.com/BUK455...eet-536703.pdf

The 540n is rated for 33 amps. The 540 is rated for 28 amps. I've seen the 540n do some strange things in the later Rockford amps so I recommend against using them (for people who have to order parts) but if they're working OK in your amp, they should be reliable.
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Old 18th December 2009, 01:54 AM   #10
damage is offline damage  United States
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That's the problem with these old amps I am finding... reliable datasheets are hard to find. Thanks!
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