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Go Back   Laser Pointer Forums - Discuss Laser Pointers > Lasers > 445nm Lasers



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Old 02-08-2011, 01:15 AM #1
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Default A140 pins

Hey guys,

I have some A-140 diodes that I am going to hook up to their drivesr soon. My question is why are there three pins? Normally I know you only connect two, but I am wondering if the third pin can be used to protect the diode in some way?

Thanks,

John


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Old 02-08-2011, 01:20 AM #2
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Default Re: A140 pins

the third pin is a case pin, rather then attaching your diode to the negative terminal of a battery, the case pin makes the laser earth negative

so if you wanted to you could make your laser case negative, you attach your negative and case pin of your diode to your negative output of your driver

Last edited by nosebleedXD; 02-08-2011 at 01:24 AM.
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Old 02-08-2011, 01:35 AM #3
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Default Re: A140 pins

yeah kinda....

As it is, the 445nm diode is case neutral, which means that neither anode nor cathode
are making contact to the outer shell of the diode.

If you wanted to change that to, say, have only one wire, and make the host itself
the negative (or positive) path, you could use the case pin for that purpose.

It's not going to protect the diode in any way.

That's what a LASORB does.
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Old 02-09-2011, 05:53 PM #4
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Default Re: A140 pins

InGaN diodes all seem to be electrically "floating" in the case, instead of using the case as a connection, but normally, third pin is there for feedback transistor, which most of our diodes don't have installed. In some pics of the LPC-815 long die open can diodes you can see the flat shiny square where this device is usually mounted, on the face of the metal perpendicular to the mounting plane of the die.

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Old 02-09-2011, 10:28 PM #5
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Default Re: A140 pins



this is the same for a140 diodes.
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