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44-pin Socket — Parallax Forums

44-pin Socket

HalcyonDazeHalcyonDaze Posts: 17
edited 2011-05-04 07:50 in Propeller 1
Anyone know if they make (and/or where to find) a 44 pin socket to fit a QFN propeller? Im attracted to the small footprint of the chip, but still intimidated by surface mount...

Comments

  • SapiehaSapieha Posts: 2,964
    edited 2011-04-25 18:54
    Hi HalcyonDaze. If I know correctly - That socket's are possible to BUY but I dont think You will buy them --- (1000$) used for some IC that need programing befor mounting on PCB.

    HalcyonDaze wrote: »
    Anyone know if they make (and/or where to find) a 44 pin socket to fit a QFN propeller? Im attracted to the small footprint of the chip, but still intimidated by surface mount...
  • Andrey DemenevAndrey Demenev Posts: 377
    edited 2011-04-25 19:03
    A socket would nullify all the advantages of a QFN package. Consider a TQFP one - it is much easier to mount (although it's still SMD)
  • BigFootBigFoot Posts: 259
    edited 2011-04-25 21:40
    There are 44 pin qpfp sockets available but they are just for testing and are very expensive. The manufacturers use them for
    burn in and temperature testing.
  • AleAle Posts: 2,363
    edited 2011-04-26 05:33
    The propeller has no internal flash/eeprom that could justify a socketed qfn/tqfp package. If you only want a handful of propellers and plenty boards you have to go DIP40. Below the package there is enough space to hide many components if space is at a premium :)
  • WBA ConsultingWBA Consulting Posts: 2,936
    edited 2011-04-26 11:23
    A QFN socket would defeat the purpose of the QFN's footprint and will cost abnormally high. Here is a thread with the same question with a link to a supplier of these sockets.

    There are a few options out there for a small footprint if you are looking for a ready to go design. The Propmodule 1x1 is a PropQFN based PCB that is very small. Unfortunately, Mctrivia is no longer making them. Oldbitcollector has a good guide (called the Propeller Cookbook) for hacking down a proto board for a mini board using the PropQFP. I make a module called the M44D40+ that uses the PropQFN and includes the full basic prop circuit in a DIP40 size package. I just need to buy Props to start making them as I have enough fabs and other parts for 500 modules.
  • HalcyonDazeHalcyonDaze Posts: 17
    edited 2011-05-04 07:50
    Huh, I was thinking more along the lines of the cheap $2 sockets you can find for PLCC type chips. Oh well. My reasoning was just to use a socket to prevent chip damage during mounting. Thanks anyway everyone
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