- Oct 2, 2019
What did you mean by the term "led the diode"?Thanks for your honesty. No hard feelings...
I don't know if that particular diode with the burnt spot was from back reflection but i strongly suspect it was. I do specifically remember decanning a 9mm 660nm that had back reflection cod and seeing the same type of damage/burn though. In my experience with the 650nm-660nm diodes if you over drive it to the point of failure it will either blow/lift the top gold layer on the semiconductor or vaporize a section of the bonding wire/s, thus causing an open circuit. I have also seen facets burnt do to overdriving but just not as often. Unfortunately I've killed more diodes than I'd like to mention... Usually if your overdriving a diode and it just stops working (doesn't go led), you have a chance (my record is about 50/50) at saving it if just a bonding wire blew. It's a pita of a soldering job to bridge the connection but if you have a REALLY steady hand it can be done. Just keep in mind that a soldering iron tip is gonna look like the size of a baseball bat next to that bonding wire under magnification and a slight flinch and it's all gone.