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Thread: Sustitute for PC900V

  1. #1
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    Sustitute for PC900V

    Looks like the Sharp PC900V series of isocouplers have been discontinued. I'm looking for a good replacement that will suitable for MIDI Input in a 3.3 volt environment.

    I'm currently looking at a Liteon 6N137S chip. Here's a link to the datasheet. Would anyone be able to advise on whether this is a suitable chip. And if not, perhaps suggest an alternative.

    http://optoelectronics.liteon.com/up...2020140411.pdf

  2. #2
    Senior Member mortonkopf's Avatar
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    I used the SFH618A-2 optocoupler for MIDI, as this was easily available. There were some comments from Paul regarding this optocoupler and the time it requires for signals. There is a short discussion about using a better one here: https://forum.pjrc.com/threads/29376...2-opto-coupler

  3. #3
    Member garubi's Avatar
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    Quote Originally Posted by yeahtuna View Post
    Looks like the Sharp PC900V series of isocouplers have been discontinued. I'm looking for a good replacement that will suitable for MIDI Input in a 3.3 volt environment.

    I'm currently looking at a Liteon 6N137S chip. Here's a link to the datasheet. Would anyone be able to advise on whether this is a suitable chip. And if not, perhaps suggest an alternative.

    http://optoelectronics.liteon.com/up...2020140411.pdf
    I too had great problem finding any PC900 avaiable so resolved to buy some 6N137S...
    I'll try them in the next days... and if you don't mind I'll report my results here.

    I'm expecting that just for processing classic MIDI IN one could use it safely, maybe the problems will begin if used in a MIDI Thru / Merge situation where the optocoupler velocity become important...

    I would be glad to have some opinion from Paul and other experts

    Stefano

  4. #4
    Senior Member oddson's Avatar
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    Looks good from the sheet and there is a reference to it working here https://forum.pjrc.com/threads/38469...ghlight=6N137S

  5. #5
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    Perfect.

    Rob

  6. #6
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    The PC900 was a clone of the H11L1, which is still made by several manufacturers.

  7. #7
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    So you're saying I can just use this for example?
    https://www.digikey.com/product-deta...1-1-ND/2675935

  8. #8
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    Yes; you can just plug in any H11L1 from Fairchild, Isocom, QT-Brightek, Everlight, or CT-Micro.

  9. #9
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    I guess many people use the 6n137 because it's half the price.
    The 6N137S happens to be the cheapest because Lite-On does not make an H11L1 (price comparison on DigiKey). Both the H11L1 and 6N137 will work just fine.

    But when you intend to produce many devices, you want the chips shipped on tape, and then the difference vanishes.
    And when you're using SMD, you're likely to want to use a smaller package, and then you end up with the TLP2361 anyway: SO-5 price comparison on DigiKey.

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