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Old 08-01-2011, 03:38 PM #1
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Default 445nm Diode Reverse Connection

I've recently accidentally soldered two 445nm diodes to 1.25A drivers in reverse, and applied power a few times for several seconds before realizing what happened. I then hooked them up correctly and they worked just fine.

I found that someone on PL had the same experience:

445 Damage

Anyone else had the same or a different result? I did a quick search on LPF and didn't find anything.


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Old 08-01-2011, 03:42 PM #2
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Default Re: 445nm Diode Reverse Connection

Yep.. seems the 445nms have some form of reverse bias protection... do that with any other common diode and you see death. Among other things too, makes this diode pretty noob friendly and hard to screw up.

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Old 08-01-2011, 05:44 PM #3
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Default Re: 445nm Diode Reverse Connection

As long as the voltage isn't too high in reverse, they'll take it all day long. It is a diode, after all.
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Old 08-01-2011, 07:35 PM #4
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Default Re: 445nm Diode Reverse Connection

I've did it with direct drive, and had no problems. But drivers can increase the voltage to get onto preset current .. that is usually the problem. Still yeah, those diodes are pretty tough.
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Old 08-01-2011, 07:42 PM #5
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Default Re: 445nm Diode Reverse Connection

I've had same experience with LPC 826 as well.


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Old 08-01-2011, 07:49 PM #6
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Default Re: 445nm Diode Reverse Connection

I have done this with a few different diodes... I have never had a diode damaged because of reverse connection. I never really believed the notion that connecting it wrong would damage a diode, as cyparagon said, they are diodes. Not to say that I connect expensive diodes so carelessly, just that I have connected a couple reds backwards before and no harm done.
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Old 08-01-2011, 09:03 PM #7
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Default Re: 445nm Diode Reverse Connection

OK, so I'll ask the question differently: Has anyone ever killed a diode as a result of a reverse connection? First hand experience.
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Old 08-01-2011, 09:07 PM #8
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Default Re: 445nm Diode Reverse Connection

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Originally Posted by Garoq View Post
OK, so I'll ask the question differently: Has anyone ever killed a diode as a result of a reverse connection? First hand experience.
PHR 803t dead. They are more sensitive.
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Old 08-02-2011, 12:37 AM #9
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Default Re: 445nm Diode Reverse Connection

Must have been some hella high voltage then. I should think that these should be able to take their lasing voltage in reverse, considering they are diodes. Maybe someone should set up a murder fund to find out some of these diodes' breakdown voltage?
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Old 08-02-2011, 02:12 AM #10
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Default Re: 445nm Diode Reverse Connection

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Originally Posted by Fenzir View Post
PHR 803t dead. They are more sensitive.
Are you positive it was because of reverse connection? It could have been ESD, they are, as you said, "more sensitive".

Seriously though, it could have been something else, just saying.
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Old 08-10-2011, 02:27 PM #11
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Default Re: 445nm Diode Reverse Connection

I've degraded a A130 diode to half output with ~7V reverse bias for a few seconds. I've killed a cheap red pointer instantly.
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Old 08-10-2011, 03:06 PM #12
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Default Re: 445nm Diode Reverse Connection

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Originally Posted by Bluefan View Post
I've degraded a A130 diode to half output with ~7V reverse bias for a few seconds. I've killed a cheap red pointer instantly.
Very interesting, thanks. According to the Nichia NDB7352 data sheet the absolute maximum rated reverse voltage is 5V.
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Old 08-10-2011, 03:19 PM #13
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Default Re: 445nm Diode Reverse Connection

5V ? That sounds reasonable .. my direct driving with 4.5V was bellow this .. but if I used flexdrive, it could easily jump over it.
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Old 08-10-2011, 03:27 PM #14
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Default Re: 445nm Diode Reverse Connection

I have punished these diodes with some of my mistakes!

http://laserpointerforums.com/f67/wiring-driver-backwards-58205.html

This is just one example.
Of the many things that can be said for these diode, Tough is for sure one of them!
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Old 08-10-2011, 03:34 PM #15
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Default Re: 445nm Diode Reverse Connection

Quote:
Originally Posted by 532 with Envy View Post
I have punished these diodes with some of my mistakes!

http://laserpointerforums.com/f67/wiring-driver-backwards-58205.html

This is just one example.
Of the many things that can be said for these diode, Tough is for sure one of them!
Thanks for the link, I didn't see that on my initial search.
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Old 08-10-2011, 03:36 PM #16
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Default Re: 445nm Diode Reverse Connection

Quote:
Originally Posted by DrSid View Post
5V ? That sounds reasonable .. my direct driving with 4.5V was bellow this .. but if I used flexdrive, it could easily jump over it.
Of course, the maximum rated forward current is 1.2A.
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C6 Laser Assembly Tutorial
How to Install a Blank Battery Contact Board Into a Drilled Pill
How to Solder a DTR Diode Module to a Survival Laser Driver & Pill Assembly
Installing and Testing the SL-SD-1/DX 26110 Driver in a C6 Pill
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