Re: gEDA-user: LED in reverse

[joeft <joeft@xxxxxxxxxxxxx>]

Karel Kulhavy wrote:

> Do you know at which voltage a typical red LED breaks down in reverse? 100V?
>  
No, more like 5v or so.  LEDs are not designed for high reverse 
breakdown voltages.

> 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?
>  
If you are talking about a current applied in the "reverse" direction it 
won't light up at all.  I haven't looked at the very bright LEDs that 
have been marketed recently, but in general I would say that most LEDs 
make lousy capacitors and won't store much charge at all.

Joe T

> Wikipedia says an avalanche reaches maximum in picoseconds. If the avalanche
> shines, does the light generated reach maximum in picoseconds as well?
>
> CL<
>
>
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