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  1. 8th February 2019, 15:43 #1
    venkates2218
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    replacing CL100 with ULN2803A

    Now i'm using CL100 with optocoupler to drive G2R2 12VDC relay.
    I'm trying to replace the CL100 and flyback diode with ULN2803A...
    Is this is correct method..?
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  2. 8th February 2019, 15:56 #2
    KlausST
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    Re: replacing CL100 with ULN2803A

    Hi,

    What is a CL100? Show the datasheet.

    If you want us to verify your idea you should additionally show us your schematic.

    Klaus
    Please don´t contact me via PM, because there is no time to respond to them. No friend requests. Thank you.

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  3. 8th February 2019, 22:10 #3
    d123
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    Re: replacing CL100 with ULN2803A

    Medium Power Transistors Suitable for a wide Range of Medium Voltage and Current Amplifier Applications?

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  4. 9th February 2019, 10:18 #4
    betwixt
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    Re: replacing CL100 with ULN2803A

    If that is the same CL100, it can probably be replaced with a ULN2803A but there are factors to watch for:
    1. ULN2803A has darlington transistors so it has a higher turn-on voltage than a single BJT,
    2. ULN2803A has internal series base resistors, including a pull-down so make sure you can drive it.
    3. You waste 7 identical drivers unless you have other uses for them. (note they share the same diode pin).

    That last point about sharing the same diode pin is important, it should be connected the same way as your existing 'flyback' diode but you cannot use the other driver stages unless they also run from the same voltage.

    Brian
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