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Is there a holder or socket for the P8X32A-M44 (QFN) style chips — Parallax Forums

Is there a holder or socket for the P8X32A-M44 (QFN) style chips

Capt. QuirkCapt. Quirk Posts: 872
edited 2007-05-09 05:01 in Propeller 1
I have been looking for a socket and found none, but I have seen sockets for 8051 chips of a similar size.

If there is none, which surface mount version is the easiest to solder without using a schmartz board?

Thanks

Bill

Comments

  • cocokiwicocokiwi Posts: 75
    edited 2007-05-06 02:39
    hop.gif·There is one, they come in a large pc board that are broken off as needed,like 40 of them!
    ···
    ······· Come in different kinds..BUT! not cheap!·· $50.00 a sheet there abouts!Hmmm! not in latest

    ······ last one maybe...got to get it from car..more later,see you!

    ······ Cheers Dennis


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  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2007-05-06 03:20
    Bill,

    Sockets like this can be purchased as “Test Sockets” and are somewhat expensive. We have had to use them for testing SX and Propeller Chips. I’m not sure where we got ours, but try searching for “ZIF Test Sockets” and see what that gets you. Take care.

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    Chris Savage
    Parallax Tech Support
  • KC8DKTKC8DKT Posts: 76
    edited 2007-05-06 15:07
    · Any chance Parallax·may start selling the sockets?··Even if you sell them at the same price as your proto boards it would still save us the time of cutting the proto boards·up.·· You will find alot of people talking about this in forum posts.
  • Capt. QuirkCapt. Quirk Posts: 872
    edited 2007-05-06 16:54
    Would the 44 pin surface mount sockets on this page work ??
    pdf
    pdf
    44 pin surface mount socket.pdf
    145K
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2007-05-06 17:17
    We most likely won’t carry them; however I will see if I can get the part number and source information and post it if someone else does not. ·Take care.

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    Chris Savage
    Parallax Tech Support
  • cocokiwicocokiwi Posts: 75
    edited 2007-05-06 17:36
    Capt. Quirk said...
    I have been looking for a socket and found none, but I have seen sockets for 8051 chips of a similar size.

    If there is none, which surface mount version is the easiest to solder without using a schmartz board?

    Thanks

    Bill
    ·· hop.gif Try!· page 300 in the Jamco cat or www.jamco.com >surface mount proto boards (Bellin·Dynamic Systems, INC)

    ······· $45.95 a board.....=quad =25 to 8 x 4 depending!

    ·· Cheers Dennis

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  • cocokiwicocokiwi Posts: 75
    edited 2007-05-06 17:45
    Capt. Quirk said...
    Would the 44 pin surface mount sockets on this page work ??
    ··· No,same as the one above· those chips have the pins wrapped around the edge so they can be pushed into the socket,that one you see is a solder to the SMT type solder tabs,the one above it has pins that go through the board!

    ·Be nice if on could get a socket with .1 spaced pins on it ,use perf board!



    Dennisidea.gif

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  • cocokiwicocokiwi Posts: 75
    edited 2007-05-06 18:03
    Capt. Quirk said...
    Would the 44 pin surface mount sockets on this page work ??
    · I found this : http://www.emulation.com/pdf/skt1554.pdf·· < Ahhhh! $400+)

    · I think this is what you want[noparse]:http:[/noparse]//www.emulation.com/cgi-cfm/insert_quantity.cfm?part_number=S-QFP-00-044-D

    · http://www.emulation.com/pdf/skt108.pdf···· < PDF file of it >· 32pin Prop chip size..within $50-$60 a part

    ·here is the list:· http://www.emulation.com/catalog/off-the-shelf_solutions/sockets/qfp/

    ·· Cheers Dennis

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    Post Edited (cocokiwi) : 5/6/2007 6:11:07 PM GMT
  • cocokiwicocokiwi Posts: 75
    edited 2007-05-06 18:05
    Chris Savage (Parallax) said...
    Bill,

    Sockets like this can be purchased as “Test Sockets” and are somewhat expensive. We have had to use them for testing SX and Propeller Chips. I’m not sure where we got ours, but try searching for “ZIF Test Sockets” and see what that gets you. Take care.

    ·burger.gif········· something like this:· http://www.emulation.com/pdf/skt108.pdf···· $50-$60

    ··················Here,s the list [noparse]:http:[/noparse]//www.emulation.com/catalog/off-the-shelf_solutions/sockets/qfp/


    ·Cheers Dennis

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    http://people.delphiforums.com/cocokiwi/Image/picture.jpg

    Post Edited (cocokiwi) : 5/6/2007 6:11:52 PM GMT
  • Paul BakerPaul Baker Posts: 6,351
    edited 2007-05-06 18:18
    KC8DKT said...
    · Any chance Parallax·may start selling the sockets?··Even if you sell them at the same price as your proto boards it would still save us the time of cutting the proto boards·up.·· You will find alot of people talking about this in forum posts.
    If Im not mistaken the clam shells we purchased cost $80 a piece so there is no way we could sell them anywhere near the price of a proto board. Sockets for surface mount are designed for testing and burning fixtures, because of this they are a limited production item and command a very high price.


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    Paul Baker
    Propeller Applications Engineer

    Parallax, Inc.

    Post Edited (Paul Baker (Parallax)) : 5/6/2007 6:34:26 PM GMT
  • Capt. QuirkCapt. Quirk Posts: 872
    edited 2007-05-06 20:54
    Thats some mighty expensive real-estate!. I was hoping to save some space on a prototype pcb, looks like the 40 pin dip is the way to go.
  • mynet43mynet43 Posts: 644
    edited 2007-05-07 15:06
    Here's a trick to save some board space.

    Put the 40 pin chip on the back of the board and mount other components on top of it.

    I have a board designed that has what the proto board has and more:
    1. 40 pin propeller with AT24C512
    2. Prop Plug connector
    3. VGA output
    4. 4 servo connectors with control signal jumpers
    5. 3 voltage regulators
    6. 4 power bus connectors, each with gnd, 3.3, 5 and 6 (or 8.5V)
    7. Reset switch
    8. Servo/motor power jumper between 5V and 6V regs.

    The whole board is 2.5" square.
    Proto.jpg
    937 x 932 - 126K
  • Paul BakerPaul Baker Posts: 6,351
    edited 2007-05-07 15:50
    Capt. Quirk said...
    Thats some mighty expensive real-estate!. I was hoping to save some space on a prototype pcb, looks like the 40 pin dip is the way to go.
    What is your intent with the socket, IOW do you really need replacibility or are you looking for a way to get around having to do surface mount soldering?

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    Paul Baker
    Propeller Applications Engineer

    Parallax, Inc.
  • Damien AllenDamien Allen Posts: 103
    edited 2007-05-07 19:38
    If you're trying to get all the main components into a small space w/o surface mount soldering. The spin stamp would be perfect for your app. It has everything you need in a 24 pin dip package, if you can afford to lose some i/o pins that is!
  • simonlsimonl Posts: 866
    edited 2007-05-08 12:31
    How about this: http://www.crownhill.co.uk/product.php?prod=1232 ?

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    Cheers,

    Simon

    BTW: I type as I'm thinking, so please don't take any offense at my writing style smile.gif
    www.norfolkhelicopterclub.co.uk
    You'll always have as many take-offs as landings, the trick is to be sure you can take-off again ;-)
  • Capt. QuirkCapt. Quirk Posts: 872
    edited 2007-05-09 00:51
    What is your intent with the socket, IOW do you really need replacibility or are you looking for a way to get around having to do surface mount soldering?
    Both Paul,

    In 2 of the Data Aquisition systems we have used for the model airplanes, they used the PLCC sockets. As they updated their software, they would just·change out·the chips. I wanted to use this method as I was in my next phase with my first pcb's.·I could always program the board, but I really wanted ZIF adapters for all my chips. (ZIF adapters fit my skill level or maybe just my comfort zone)


    I also didn't want to solder the surface mount and there was no space savings by using a Schmartz Board. The "surface mount" socket on the 44 pin surface mount socket.pdf ,·converted a .5mm pitch to a .100" pitch w/pins for a pcb. And of course I never heared of a "Clam Shell" before this thread.·Size and weight is important.

    I picked a big first project, a·semi electronic fuel injection and engine management system. It's based off a similar board by SAIC with a BS2SX,·that was intended to adjust one or two carburators for a UAV or a Giant Scale model airplane. It wasn't until I finished all the basic programing, that I discovered major design flaws with·the hardware. I still have the need for such a system, so I am building my own. I have learned a lot and I really want·it to be as profesional appearing as possible within my own skills.

    Bill

    BTW, what's· "IOW"

    Post Edited (Capt. Quirk) : 5/9/2007 2:21:02 AM GMT
  • Capt. QuirkCapt. Quirk Posts: 872
    edited 2007-05-09 05:01
    ·· hop.gif Try!· page 300 in the Jamco cat or www.jamco.com >surface mount proto boards (Bellin·Dynamic Systems, INC)

    ······· $45.95 a board.....=quad =25 to 8 x 4 depending!

    ·· Cheers Dennis
    CocoKiwi,

    Those are interesting boards and there size appears smaller than a 2.0" x 2.0" schmartz board, I am going to look into it further and find out how easy they are to use. Thanks

    Damien Allen,

    You mean the PropStick-USB?. Well, hit me with a stupid stick!. That's a damm good idea.·After trying to do it the hard way, I would have wasted more than $100 just in my labor. I could use that in a 40 pin zif if I wanted too. It's·everything cramed into the least amount of space possible and it's easy. I could also use both sides of the board and save valuable·space.

    Sincerely

    Bill M.

    Post Edited (Capt. Quirk) : 5/9/2007 5:54:52 AM GMT
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