Stats

  • State Suggested Answer
  • Replies 5
  • Answers 1
  • Subscribers 164
  • Views 9168
  • Members are here 0
More Content

How to pour copper on an existing footprint?

Neil mustafa

Hello all,

I am a beginner with Allegro and would like to get some assistance on this issue that I am having. I am trying to pour copper around the pads of an LED footprint, I am not sure how I can achieve that and would appreciate it if I can get detailed steps. Here is the (.dra) footprint that I got below and I am trying to modify it to achieve that:

The idea is to dissipate some of the heat created by the LEDs so the copper (square or rectangle ) around the pad will act like a heat sink. Thank you very much. 

Best regards.

Neil Mustafa.

Parents
  • JITHINDEV
    0

    Hi Neil Mustafa,
    Choose "rectangular shape," then make the class ETCH and subclass TOP.
    and draw the rectangle over the pad.
    reference image attached.
    this may help to achieve your requirement.
    cheers
    Jithindev


  • avant
    0 in reply to JITHINDEV

    If you want the shapes to be connected to the pins, select the shape, right click on mouse, and select change net. Then pick the pin to select the net on the pin. If you connect a large shape to a pin, it may hinder soldering the pin (because of the shape acting as a heatsink). Maybe the data sheet has some examples for heatsink.

Reply
  • avant
    0 in reply to JITHINDEV

    If you want the shapes to be connected to the pins, select the shape, right click on mouse, and select change net. Then pick the pin to select the net on the pin. If you connect a large shape to a pin, it may hinder soldering the pin (because of the shape acting as a heatsink). Maybe the data sheet has some examples for heatsink.

Children
  • Neil mustafa
    0 in reply to avant

    Hi Avant!

    It does not giving me an option to assign it to a net, and the Pad (SMD pin) isn't assigned to any net either, I believe that option is available only for .BRD and not .DRA files. Any other suggestions?

  • Neil mustafa
    0 in reply to avant

    Hi Avant,

    This is a footprint (.dra file). As you can see, it doesn't give me the option of assigning the shape to a net, and the pin (the smd pad) isn't assigned to a net either. also, if I place the shape on top of the pad , it gives me a shape to smd pin DRC error. Any suggestions?

  • jc teyssier
    0 in reply to Neil mustafa

    Hi,

    does pin origin in copper shape? If not you have to modify the shape to cover the pin origin. You will still get drc in footprint (dra file) but do not care: while placing the component in brd the shape will automaticaly get the same net that the pin and no drc will be generated

Cadence Guidelines

Community Guidelines

The Cadence Design Communities support Cadence users and technologists interacting to exchange ideas, news, technical information, and best practices to solve problems and get the most from Cadence technology. The community is open to everyone, and to provide the most value, we require participants to follow our Community Guidelines that facilitate a quality exchange of ideas and information. By accessing, contributing, using or downloading any materials from the site, you agree to be bound by the full Community Guidelines.