Correct land pattern for Propellor's LQFP package

Comments

• T Chap Posts: 4,249

  2007-04-03 10:59 edited 2007-04-03 10:59

  The Jedec isn't specified here but maybe you can make some conclusions:
  
  http://forums.parallax.com/attachment.php?attachmentid=42633
• OzStamp Posts: 377

  2007-04-03 11:11 edited 2007-04-03 11:11

  Hi Mike
  The Propeller datasheet ( here in this forum recently posted is a good doc for this)
  Not sure if it list the jedec std number but it has the correct land pattern detail for you.
  
  Ronald Nollet Australia
• Paul Baker Posts: 6,351

  2007-04-06 22:05 edited 2007-04-06 22:05

  The packager of our chip didn't provide us with a JEDEC spec, but did provide a package drawing. That drawing and the land pattern we use for our own products which use the QFP version has been included in the datasheet. You can use that to compare against the JEDEC to determine which it is, if you do determine which one it is, please let us know·so we will have the information in the future.
  
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  Paul Baker
  Propeller Applications Engineer
  
  Parallax, Inc.
• Mike Young Posts: 10

  2007-07-24 04:14 edited 2007-07-24 04:14

  Thank you; I posted my original question before the datasheet was posted. I used the land pattern on the data sheet successfully with an IR reflow process and the QFPs are stuck on the boards consistently.
  
  Using the PCB Libraries IPC-735X software suggests that neither the QFP nor QFN packages have direct JEDEC equivalents. Some of the packages are close but I'd be real hesitant to use them for automated assembly. At any rate the published lands seem to work fine. If anyone needs them, shoot me an email and I'll send you the Mentor Graphics PADS Suite library entries I'm using.
  
  V/R
  Mike