View Full Version : Prop I/II in QFN

05-29-2010, 01:24 AM
I believe Chip said at UPEC that he's thinking about QFP type package only for Prop II.

Somebody from Parallax told me that the QFN package hasn't sold anywhere near as well as DIP or QFP.

So, I imagine that's the reason that Prop II won't be in QFN.

My question is this:· Why isn't the QFN Prop cheaper than DIP or QFP?
I think if it were $2 cheaper then I would use it.

Don't know what the actual cost to make different packages is, but I have to imagine that QFN is a lot cheaper than DIP or even QFP to make.
At Digikey.com, I often see that the surface mount version of chips is usually cheaper.·
So, why are the Prop chips all the same price?

My Prop Info&Apps: ·http://www.rayslogic.com/propeller/propeller.htm

My Prop Products:· http://www.rayslogic.com/Propeller/Products/Products.htm

05-29-2010, 01:44 AM
Rayman said...

My question is this: Why isn't the QFN Prop cheaper than DIP or QFP?....

You mean it's not obvious? QFN users are subsidizing DIP users. How else are we lowly DIP users going to get anywhere in this world if we aren't standing on the shoulders of giants?


05-29-2010, 02:09 AM
I think it has something to do with the Equal Protection clause of the 14th Amendment (http://en.wikipedia.org/wiki/Fourteenth_Amendment_to_the_United_States_Constitu tion) with regards to treating all chip packages fairly.· Alternately, perhaps it has to do with Parallax's philosophy of keeping things simple and the fact that the overhead involved for packagers and Parallax probably swamps other costs.· But it's an interesting question.· I'm glad QFP is being retained and not the other way around (though both would be okay).