refdes help

[david_c_partridge]

I needed a part for an MMBT2222A, so I copied the 2N2222A from the master database to the user database, and changed the footprint to IPC7351/TO-236AB.

That seems fine, but whenever I place one or renumber components, I get the RefDes prefix of U instead of Q which I expect?

What do I need to do to get the component refdes prefix to be Q like all the other xistors?

Thanks

Dave

[NatashaB]

Hi Dave,

I am assuming you are referring to Multisim.  To change the RefDes of a component in Multisim, you need to change it at the instance level: 

1. Double-click on the component to invoke its properties
2. In the Label tab, change the RefDes as desired

In Ultiboard you can change the RefDes at the instance level or at the component level:

(Instance Level)

1. Double-click on the component
2. In the Attributes tab, double-click on RefDes to change its value

(Component Level)

1. Go to Tools > Database > Database Manager
2. Edit the component (if it is in your user or comporate database; otherwise, you will need to copy it there first)
3. You should see a RefDes attribute on the symbol (U?) that you can double-click on and change

 Let us know if this solves the problem.

Message Edited by NatashaB on 08-05-2009 01:24 PM

[GarretF · Accepted solution]

Hi Dave,

The other possibility is that Multisim uses a default RefDes prefix for new components. This default is set per family, so depending on where you saved the component in your user database, you may get a different default RefDes prefix.

You can change the default for any family:

1. Go to Tools > Database > Database Manager

2. Select the Family tab

3. In the Family Tree, find and select the family where you saved the component.

4. Change the Default Prefix to Q.

5. Click Close

Now when you place the component, the RefDes should start with Q.

[david_c_partridge]

Garret,

YES, that was it - thank you very much.

Dave