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OrCAD Capture - is there a way to replace selected parts on a schematic with a different part from a library?

AustinFranklin

I have an OrCAD Capture schematic that has a number of 1k resistors throughout the design.  i need to replace many of them with 2.2k resistors.  The parts are from a library (each value/type is an individual part, one part is a 1k 0402, another is a 2.2k 0402 etc), I am not using a CIS database.  I can't replace/update the cached 1k part, as that would change all of the 1k parts in the design, and I only want to change some of them.  Is there a way to do this within Capture, or does anyone have a TCL script that will allow me to do this?  I want to preserve the REFDES when doing this replace, and not have to replace each part manually and then manually fix the REFDES.

Any help/suggestions appreciated,

Austin

  • redwire

    Wow. Let me first say this is a horrible technique for part management.  This comes from people that started in Viewlogic and other cad programs that could not use variable data for BOMs. 

    Sigh...If you truly have unique instances in your library then you can can replace once instance with another through the design cache manager.  Open the cache and select the part. Right mouse and do a replace.

  • AustinFranklin
    I believe creating libraries allows for far better reuse/portability and parts management. I don't want to get into a discussion about parts management here. I have a problem to solve.

    I appreciate the suggestion, but I don't believe it will work. Replacing the cached part will replace all instances of the 1K resistor in the design, which is not what I want to do. I want to replace only some of them. This should be a basic schematic tool operation.
  • redwire

    Unfortunately cache replace does them all which is what I took from your first question.  You will have to plop down new parts and match up their references at this point.

    If it were just properties (not symbols) that were changing then yes there is another way.

  • AustinFranklin
    Thank you. If that's the case (can't be done with the tool as is), then I hope I can write a TCL script to do this. It's impractical (from a time and error standpoint) to replace them individually, as this extends to hundreds of resistors and hundreds and hundreds of decoupling caps as well. With the properties all on the schematic (as in, using a single RESISTOR graphic and part, and modifying the properties on the schematic for every variant you want of that part) I am aware of the browse/spreadsheet method to handle designs done this way. I've been able to do what I want with an XML (or HTML) export/modify/import, but that is not easy for more than a few parts without writing some code to better automate it. I believe spending time on that would not be as useful as a TCL script to replace selected part(s) in Capture. I was hoping someone had already written this script, as it seems like such a basic need.
  • oldmouldy

    I appreciate that Capture CIS, which will do exactly this - use a single graphical part and allow Part Properties to be linked to a database of required properties - isn't free but it may well work out to be lower cost than implementing custom code to do this. And have the benefit of supporting this for all future designs.

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