Diode pinouts for 532nm modules?

Hi Guys,

Sorry for these real noob questions here but no luck with the old search button I'm afraid.

Are the pinouts for a green module diode always the same? I'm assuming there are not many varieties of IR diodes used when not a C-mount; 5.6mm for low power, 9mm perhaps for higher powers? I have a 100mW module from O-like that draws 620-625mA and I want to Flexdrive it but cannot, 'read', the driver circuit for the -ve connection, all three pins are soldered either in circuit or for support, and probing them is not giving me too many clues.

I know that they are case +ve so it only leaves me two pins to try. Previous boldness with throw away diodes tells me it probably just won't light with one leg, and light with the other, but I only have the one 100mW module and my 50mW just won't cut it for this build!

Help graciously received,

M

There should be 2 pins that have a black ring around them, one is the negative and the other is some sort of current/temperature feedback pin. Looking at a module here, the pin on the right while the case pin is down looks to be the negative pin.

If possible, I would turn the current way down and try the left pin. Use a camera or webcam to see if you can see the "red light" down the aperture. If that pin does nothing I would then try the other.

I do not think the third pin is necessary to run the diode, but I could be wrong...

You could also put a multimeter up to the pins and test for continuity, I'm not sure if or what the "wrong" pen would read though. I would assume it is not a diode, so you could try to reverse the meter and see if one pin behaves as a diode should.

Just where I would start, hope it goes good for you!

Thanks Pontiac. I would do the continuity or diode test function on my DMM but the forward voltage is so high on these diodes compared to normal ones that when I've tried that before they don't give good enough readings to be confident either way, (okay, 2.?V ain't that high and it is an IR, but... ).

Putting power through it down low will be the next best thing. I have some 300mW 5.6mm IRs here and was going to follow their pinouts for starters.

I was just hoping for that magic post. You know the one. That just falls into your thread with all the answers?! Ha!

If they are pretty standard then I wonder why the pinouts are not in the, "Diode Compilation", thread? Maybe they are far from standard, maybe not worked on commonly enough IDK. That'd explain it though I suppose.

Dive in head first it is then!

Thanks,

M

Well, I dived in head first. This pool was too shallow! Popped my favourite module... :cryyy: Stoopid a$$, small brained, simple mistake of putting in 0.5V too much to identify the pins. I had the right ones though if that's any consolation! :thinking: err, no. It's not!!!! :scowl:
Morgan, you're a EEEEEDIOT!

M


(P.S. It's the one on the right of the case pin when held as Pontiac describes above)

Ouch, that hurts!

Sorry to hear it didn't go well for you, but at least green modules are cheaper now then they were a couple years back!

Thanks, it was painful for a while but it's the onyl green I've destroyed so far. I hope it's the last.

New one should be here Monday!

M

Morgan said:

Thanks, it was painful for a while but it's the onyl green I've destroyed so far...

Click to expand...

Don't throw that module yet!!!

I would try to extract the dead IR diode and replace it with another, maybe one of the members on LPF (heruursciences, or Chris) could help you as he's very knowledgeable with IR diodes, and he used to sell them.

A nice set of crystals in that blown-up module, worth salvaging. If you don't want to bother with it, let me know if you want to get rid of it, maybe I could compensate you in some way to acquire it. :evil:

Robert

The isolated pin on the left is the photodiode pin.
The isolated pin on the right is the diode cathode (-).
The case pin at the bottom is diode anode (+).

808nm diodes usually only need about 2.2V.

roddenberry said:

Don't throw that module yet!!!

I would try to extract the dead IR diode and replace it with another, maybe one of the members on LPF (heruursciences, or Chris) could help you as he's very knowledgeable with IR diodes, and he used to sell them.

A nice set of crystals in that blown-up module, worth salvaging. If you don't want to bother with it, let me know if you want to get rid of it, maybe I could compensate you in some way to acquire it. :evil:

Robert

Click to expand...

Thanks, as usual with the thankfully small number of things I blow up, it'll be hanging around for a while. The sentimental attachment of being my first quality green module will get me round to trying to repair it at some point. It'll be the next stage in my laserist development I think!

However, should I feel the need to part company I will try to remember this post and look you up.

RA_pierce said:

The isolated pin on the left is the photodiode pin.
The isolated pin on the right is the diode cathode (-).
The case pin at the bottom is diode anode (+).

808nm diodes usually only need about 2.2V.

Click to expand...

Thanks also. Are all pump diodes this configuration? I know it turned out that the pins were in fact the same as the other IR diodes I have here, (wavelength unknown), which were the same as described in your post. It was a numpty mistake to blow it as I left the voltage setting at somewhere closer to 3V, (pre-removal of the driver setting). Nice, split second, green flash let me know I had the pinouts correct though!

THanks,

M

Morgan said:

Thanks also. Are all pump diodes this configuration?

Click to expand...

All the 808nm pumps I have seen (including C-mounts) have been case positive.
I'm not sure about other near-IR or IR wavelengths, though.

Okay, and it doesn't damage the emitter if the photodiode is powered up, assuming there is one in any given package? Even powered to overload?

Sorry for all the Qs but it's adding to my knowledge.

Thanks,

M