The Inside Look of an H-Package Diode

Hey All,

So I purchased A H-Package diode that i thought i would give a try because i had a little money to spend to see if it would work and i have never seen one in person before.

I new most likely it would not laze but for what i got it for it was OK. Plus i know i can reuse the mount the diode was sitting on for this other project Ive been wanting to finish.

So after finding out that it would not laze "The diode seems its shorting somewhere within itself":undecided: I took it apart to see what the inside of it looked like. I could not find any pictures on the web so i figured i would snap some photos that might help someone later on and or just interesting to look at.




Pictures:



































Does anyone know what that Green "Thing" is below the diode.? Look like some kind of chip.?


This diode was Suppose to be a 670nm 350mW diode. However looking up the DataSheet I noticed that the diode i had, had only 9 pin where the diode in the DataSheet had 10.!

So of course The pin out was not correct. Playing with my DMM Probes everything i tried was shorting. Except for the tec. The tec worked.

So Opening the casing to get at the C-Mount to see if at least the the short was somewhere else not at the diode. But to my surprise the diode is shorted.:thinking: I have no clue how that is possible. Iam going to send the diode off to a friend with a Microscope to look at and see if he can find whats going on. But i was stumped trying to figure out whats going on.

So if the diode is not fixable or i cannot find the problem i have a nice C Mount with Tec Holder for my project.

Seems they had the TEC attached to the casing with indium.

I Must say i really like the way the mount for the C-Module is designed with the Tec.

Iam going to clean up the cuts on the casing and maybe re attach the TEC mount to it .




:thanks: For Looking.!!!

This is a great asset to the forum! Thank you sir, +1.

May I ask a stupid question? How the heck did you get the top off of yours? I've been staring at one for months, and for the life of me, I haven't been able to figure out where the seams are!

rhd said:

How the heck did you get the top off of yours?

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He is Angelos. If it is made of metal, he will bend it to his will.

Trevor

rhd said:

This is a great asset to the forum! Thank you sir, +1.

May I ask a stupid question? How the heck did you get the top off of yours? I've been staring at one for months, and for the life of me, I haven't been able to figure out where the seams are!

Click to expand...

It seems the diode casing is all one piece but there had to be some way they put the inside in it. So the top part and the base are 2 separate pieces I believe. They do such a good job it looks like one solid piece..

But I myself did not know how to take it apart as there where no Pictures i could find on such package.

So What i did was make 2 cuts with a Dremel as close to the outer ridge of the casing to make sure i dont hit anything sensitive in there. Then I just started to bend back and it came off at the upper ridge. The Top where the window is, is not that thick. SO it bends easy.

Trevor said:

He is Angelos. If it is made of metal, he will bend it to his will.

Trevor

Click to expand...

I will get it open one way or another. Though it took me a little bit to think of a plan on where to make the cuts. I dint want to hit anything even though the diode iam pretty sure is no good.

I don't know what that green thing is... but if I had to guess it is probably a temperature sensor, seeing as though it does not connect to the lasers circuit at all.

Also are those other pins being used? Or is there tiny wires coming off them that I can't see in the picture.... namely pins 2, 3 & 4

bobhaha said:

I don't know what that green thing is... but if I had to guess it is probably a temperature sensor, seeing as though it does not connect to the lasers circuit at all.

Also are those other pins being used? Or is there tiny wires coming off them that I can't see in the picture.... namely pins 2, 3 & 4

Click to expand...

I see. I thought that thermistor was for the temperature control.:undecided: Maybe the thermistor was for the tec and that green thing a temp sensor for the diode.?


Most of the Pins had small wires coming off them. Part of the problem why it was not lazing could have been that some of those wire where broken. But iam unsure as it seems the actual laser diode had a short in it.

Nice pictures ,

maybe the grenn thing/chip is a photo diode as on the c mounts a fraction of the light goes out the back of the die , i carnt see it but maybe if a aprt of the green chip is usnder then back of the c mount it may be a photot diode to messure light output from it ?

The little green chip under the diode appears to be an optical feedback sensor, photodiode of sorts. Same like the ones you've got under dies of red and IR 5.6mm diodes.

The short could possibly be because of the bad insulation between the pin which connects to the diode's arm, and the case it is going through. Try looking at that first.

Also, are you sure you're measuring a short, and not a just small resistance (actually, voltage drop) that the diodes usually have?

That makes sense guys. Thanks.

Yes that is what i was think too that it was one of the small wires from the arm. I cannot Zoom in or see any closer with any of the tool i have available to me so i will send it out to a Friend with a microscope to look at for me. Ill keep you updated.

Yes its a short not the little Resistance that diodes give off.

When you touch my 2 probes together on the diode option on my DMM it will make a loud solid buzzing/beeping sound which means that there is a short or connectivity.

When testing a normal working diode it shows the Resistance and on some diodes it even lights it up a little.

So for sure 110% its a short.

Awesome pics. I've always been curious about what was in the H-package.
:thanks: for the contribution to the community. :beer:

lazeerer said:

When testing a normal working diode it shows the Resistance and on some diodes it even lights it up a little.

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Both polarities? The other diodes you've worked with were low power with higher voltage drops. This diode is high power with a low voltage. I think you should give it an amp or two anyway. What's the worst that could happen?

rocket689 said:

Awesome pics. I've always been curious about what was in the H-package.
:thanks: for the contribution to the community. :beer:

Click to expand...

Thanks Buddy. I have another one on its way that if does not work will document it a little better on the opening process.

Cyparagon said:

Both polarities? The other diodes you've worked with were low power with higher voltage drops. This diode is high power with a low voltage. I think you should give it an amp or two anyway. What's the worst that could happen?

Click to expand...

Here is the DataSheet for this diode:
S-67-350C-50-H datasheet and application note, data sheet, circuit, pdf, cross reference, pinout | Datasheet Archive


^Well what i was told was the DataSheet.


Operating currant 700mA
Voltage drop <2.5V

Anyway i could not give it any currant/power as it was shorted and my power supply keeped cutting out on me which i guess has some kind of short circuit protection.

I have the 250mW version of this same diode coming to me now."Should be here early next week" I hope that this one wont have this same problem.

If it doesn't then i will try What you say s this might not be the diode the seller claimed.:undecided:

What power supply did you use? Doesn't sound like a good one.

Bluefan said:

What power supply did you use? Doesn't sound like a good one.

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The Power supply works fine. Alot of people use this same one that i use.

YH-305D 30V 5A Adjustable Variable DC Power Supply | eBay

Ive tested lots of diodes on it with no problem.



The diode is on the way to a friend to look at under a microscope. Hopefully he can see what the problem was.

Your power supply should be able to put 700mA through it, short or not.

Well It made a click sound like it was switch over to something and i stopped turning because it scared me so i shut it off. I dont remember what it was at. I dint want to damage the supply so i dint try again.

I dint know it can do 700mW short or not. Thanks for the Info.:beer: