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 Need model for Q2N3903 

Last post Sun, Mar 10 2013 6:35 PM by krugerb. 3 replies.
Started by krugerb 09 Mar 2013 07:39 AM. Topic has 3 replies and 1029 views
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  • Sat, Mar 9 2013 7:39 AM

    • krugerb
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    Need model for Q2N3903 Reply

    I am trying to complete an assignment for my design class.  This assigmtent involves both the Q2N3904 and the Q2N3903 BJT's.  I am using the 16.6 version of Orcad Capture.  I have a model for the Q2N3904, but not the '03.  In my searches for this I have found that there is a supposed library called pspice.olb, but I have not been able to find this to download it.  I also found that there is a bipolar.olb.  This I found and brought up in capture.  I was able to place a part identified as a Q2N3903, but when I run the spice simulation I get this error:

    ERROR(ORPSIM-15113): Model Q2N3903 used by Q_Q3 is undefined

    Now the place I found out about the bipolar.olb was talking about orcad 16.2.  Is there a version issue here?  If so how do I model the the Q2N3903?  My instructor did give me the parameters for the model, is there a way for me to make the model myself? 

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  • Sun, Mar 10 2013 4:41 AM

    • oldmouldy
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    Re: Need model for Q2N3903 Reply
    I suspect that you are not running a license installation and the unlicensed installation supports limited libraries for PSpice simulations. Try, PSpice>Edit Simulation Profile from the menu, the Configuration Files tab, pick Libraries on the left and use the upper Browse button to browse for the bipolar.lib in the tools\pspice\library directory of the installation, use the Add to Design to add this simulation to the profile and that should simulate. You may have to re-add this library in subsequent sessions since the unlicensed installation supports limited libraries for PSpice simulations.
    • Post Points: 20
  • Sun, Mar 10 2013 8:32 AM

    • alokt
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    Re: Need model for Q2N3903 Reply

    Oldmouldy is right, if you are running Lite (earlier known as Demo or Student) version of PSpice, you may get above error. Above mentioned steps should help resolve the error. 

    Additionally, you can place generic NPN transistor part QBREAKN from "breakout.olb"  and edit it's model, as you already have model parameter for this device. For Editing the model, select the part instance in Capture and Do Edit Model from RMB and update the model parameter in Model Editor. You need to have exact spice .model statement for 2N3903 device.

    • Post Points: 20
  • Sun, Mar 10 2013 6:35 PM

    • krugerb
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    Re: Need model for Q2N3903 Reply
    You are both right about the version I'm using, it is the more limited student version.  The problem was that I had only used the .olb version of the library, and did not know about the need for the .lib version for spice.  I got it to work finally, thanks for your help.
    • Post Points: 5
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Started by krugerb at 09 Mar 2013 07:39 AM. Topic has 3 replies.