quesion on ZIF sockets

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#1
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Hi Freaks,
I am thinking of using ZIF sockets for my breadboard so I don't have to fight with breaking my AVR pins every time I remove the chip from the breadboard.

I was looking online and saw two different suppliers. The price difference baffles me. Is there something I am missing between the two? Thanks.

$15.49:

[url]
http://www.apogeekits.com/zif_so...
[/url]

$4:
[url]
http://evilmadscience.com/partsm...
[/url]

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Cheaper still: http://www.sparkfun.com/commerce...

Can't comment as to the difference in price.

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Jeepers, that's cheap! I'm paying 15euro a pop over here. I need to stock up on some of those next time I'm back in the States.

No idea why there's a price difference either. After having spent years looking at these kinds of parts, I'm convinced that businesses sometimes price certain things out of this world expensively. If they offer two competing products, they don't lose any business, and with a bit of luck corporate and university purchasers won't dig too deep and will stop as soon as they find the "reasonably" priced one-- whatever "reasonable" means to them.

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The expensive one is blue. Cheap one is green. Simple :)

Probably gold versus tin or surplus versus new. Just a guess.

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If need to remove a chip from a socket frequently I just add another socket :) that way the extra socket takes the abuse, not the chip.

But usually I arrange things in such way I don't have to remove the chip at all and use ISP/JTAG/dW ;)

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They're both 3M/Textool, but the first one is wide with 0.6 inch pin spacing and the second is narrow (0.3 inch). The list price for either type is about $10, so the Evil Mad Scientists are offering an excellent deal (they tell you it's surplus stock) and Apogee Kits are marking up significantly. Since Atmel 28 pin micros are all narrow packages anyway, your choice is easy.

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Yes, I think you are right peret. I wish the STK500 had a ZIF socket like that. It's a pain trying to remove chips in and out of the existing socket. I guess the obvious reason,Atmel didn't use the ZIF socket is because of board space. But then since you can use any chip upto 28 pins for a 28 pin ZIF socket, maybe they would have saved on board space. The other reason could be that the ZIF added parasitics but at MHz, I don't see how the parasitics could have affected the performance of the chip.