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Thread: A-140 vs. M-140 vs. H-1600

  1. #1
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    Default A-140 vs. M-140 vs. H-1600

    There has been a bit of speculation about the "efficiency" and current differences between the diodes from the different models of projector


    Well there is a good reason for this.

    The (older?) A-series used a different diode than the M series and the H series. We will need to find a recently manufactured A-series to see if they have switched to the newer diode or not

    I recently bought an H-series for my home projector use.
    The projector arrived with some physical damage.
    I made a deal with the seller for the broken one and bought a second
    That allowed me to have diodes from both the H-series and the A-series on hand.
    DTR provided me with a M-series diode

    Please forgive my horrendous macro-photography skills
    My lack of photography skills is legendary

    On the can side, there is no difference in the diodes.
    The cans are all plain and devoid of markings

    The differences begin to show on the back of the can

    ***************************A-series********************************M-series******************************H-series***********



    The M and H series diodes have a "spot/circle" above the square code
    The info inside the square code is different as well, but that may also cover batch, date, etc.


    The difference is OBVIOUS once we get inside
    Yes My macro sucks.
    However, you can make out the difference AND I have provided a hand drawing of what you are looking at

    A-series


    M and H series


    Here's what you are looking for


    The A-series diodes have three contacts spread evenly across the die from both posts

    The M and H series diodes have four contacts. The contacts on one side are spaced with three at the top of the die and one at the bottom of the die from one post.
    The four contacts, from the other post, are evenly spaced

    Peace,
    dave

  2. #2
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    Very interesting. With more wires you should think that the M140 and H1600 have more single emitters combined so they can produce more power. But then the emitter should be bigger in size i guess. Are the emmiters the same size in length?


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  3. #3
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    Yeah, get your electron microscope out and get to work ..

    Seriously though, thanks for posting this info. Very very interesting . Kudos to ya' Daguin!
    I'll send you a rep point lol .

  4. #4
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    LOL! I'm even older than I look in my avatar

    I'm working with a 30-power jeweler's loop here

    They "appear" to be the same, but I wouldn't bet the farm on it

    I have someone who volunteered to take some new macro shots of them.

    Maybe he can get both emitters reflecting light in the same shot.

    In application, the M and H series diodes are producing more output at the same currents as the A-series

    We're beginning to exceed 2W, regularly, from some diodes

    Maybe I'll pull out the big bench PSU and run an IP/OP graph

    Peace,
    dave

  5. #5
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    Again Dave thanks for doing this for us. It appears the speculation that the M and H are in fact a new diode and not just higher bins of the same diodes the A series projectors had is correct. The best part is we can now distinguish with the markings on the back if we have truly been buying a M or H series diode and not just a A's sold as an M's.

    So would it be reasonable to say that these are most likely the 1.7W 445 diodes from Nichia even though the data sheet says it is a 9mm can?
    http://www.nichia.com/specification/.../NDB7875-E.pdf

  6. #6
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    Quote Originally Posted by DTR View Post
    Again Dave thanks for doing this for us. It appears the speculation that the M and H are in fact a new diode and not just higher bins of the same diodes the A series projectors had is correct. The best part is we can now distinguish with the markings on the back if we have truly been buying a M or H series diode and not just a A's sold as an M's.

    So would it be reasonable to say that these are most likely the 1.7W 445 diodes from Nichia?
    http://www.nichia.com/specification/.../NDB7875-E.pdf
    That is what we were thinking as well.

    Peace,
    dave

  7. #7
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    very interesting.. i'd like to see a corresponding comparison of near and farfield spot sizes.

    c.
    suppose you're thinkin' about a plate o' shrimp. Suddenly someone'll say, like, plate, or shrimp, or plate o' shrimp out of the blue, no explanation. No point in lookin' for one, either. It's all part of a cosmic unconciousness.

  8. #8
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    I was actually just looking at the data sheet and saw something interesting. It says:

    "This model has a protection device built in as a protection circuit against static electricity"

    I have not heard of this before. Is this a common feature on diodes or something new?

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    Did someone ever analyse the 2D codes on the back ?

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    Has anyone had a chance to do NF and FF comparisons yet? I am curious to see the difference, if any.
    If you're the smartest person in the room, then you're in the wrong room.

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