Re: gEDA-user: LED in reverse

[Karel Kulhavy <clock@xxxxxxxxxxxxx>]

On Fri, Nov 17, 2006 at 10:56:37AM -0600, John Griessen wrote:
> 
> 
> Karel Kulhavy wrote:
> >Do you know at which voltage a typical red LED breaks down in reverse? 
> >100V?
> 
> [jg]usual is 10, 15, 20 Volts only....for the ones from 1979 in a 
> hemisphere on cylinder plastic molding....
> 
> >
> >What happens when the diode is charged slowly with a current source of say
> >0.5mA until it breaks down and it's internal capacitance discharges by
> >avalanche?  Will it blink or stay dark in the process?
> 
> [jg]flashes once, then dead...

How is it possible that the LED withstands 20mA in forward and is destroyed by
0.5mA in reverse? If it has say 1.5V forward and 5V reverse then the amount of
energy dissipated is greater in the forward case.

CL<
> 
> 
> 
> John G
> 
> 
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