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How much current is required to kill a 0.5mA rated red LED?
How much current would be required to kill a 0.5mA rated red LED within a matter of seconds? I know that running past maximum rating will reduce brightness and component lifespan, but how much current would be required to heat it up to the point of failure within a matter of seconds?
3 Antworten
- vor 1 JahrzehntBeste Antwort
If the diode is really rated at 0.5mA I have to imagine its going to go way before 1Amp. Your best bet may be empirical testing, get a bunch of LEDs and start destroying them. As with anything that is produced you are going to find a range.
- tlbs101Lv 7vor 1 Jahrzehnt
Figure the thermal resistance from the junction to the leads is on the order of 200 to 300 degreeC/Watt, and the failure junction temperature is approximately 150 degrees C. That means you need to pump about 2 Watts into the diode for it to fail in a matter of seconds. For a red LED, that is about 1.3 Amps. For a green LED that is about 1 Amp.
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- Anonymvor 1 Jahrzehnt
It really depends on the diode.
You can actually shove a whole ampere through an ordinary (20mA rated) LED without damage, as long as you keep it to a brief pulse and keep the duty cycle down. The resin envelope keeps the semiconductor junction and bonding wire from vaporising.
