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Old 13th December 2011, 04:06 AM   #11
! is offline !  United States
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Join Date: Jun 2005
Location: Midwest
Look at the spec sheets for a (8A in this case) diode. I'll randomly pick the first one a web search finds, http://www.nxp.com/documents/data_sheet/BYC58X-600.pdf

8A is only the average current rating. Non-repetitive forward peak (for 10ms) is 110A.

Last edited by !; 13th December 2011 at 04:09 AM.
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Old 13th December 2011, 09:59 AM   #12
AndrewT is online now AndrewT  Scotland
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Location: Scottish Borders
10ms is the whole half wave period.
A pulse from the mains waveform that remains at full peak amperes for just 10% of the halfwave will be 1ms.
If the current ramps up to peak and down again then the time at peak or exceeding 50% of peak amperes is very likely to be <<1ms duration.
The 500us single pulse transient capability of the diode is likely to be a few (or many) times the 10ms limit.
regards Andrew T.
Sent from my desktop computer using a keyboard

Last edited by AndrewT; 13th December 2011 at 10:15 AM.
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