Homebrew PCBs

http://www.geocities.com/leon_heller
----- Original Message ----- 
From: "Anthony" <toftat@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Wednesday, January 25, 2006 3:24 PM
Subject: [Homebrew_PCBs] Making a homebrew board using QFN packages


> After great success with through hole boards, I have a new project
> starting, one of the components I want to use is the nRF905 from nordic
> semiconductor, the '905 is only available in a QFN package which
> doesn't seem to be the most hobbiest friendly of formats. As far as I
> can tell there are no legs on it...
>
> Is it possible to hand solder one of these, filling in the gap? do they
> make sockets for them (I have found prototype sockets on line but $400-
> $500 each they are a bit out of budget)

I have managed to solder the similar packaged ADXL202 onto a home-made PCB. 
It was difficult, though. It helps if you make the pads longer than they are 
on the standard QFN footprint, so that you can get the tip of a soldering 
iron in there.

I tried with the Nordic nRF2401 on a double-sided PCB, but gave up and had 
them mounted by a specialist SMT assembly company. They didn't charge me as 
it was such a small job (it took them about 20 minutes), it was just before 
Xmas, and I'd gone a long way on my motorbike to get to them. 8-) Their 
minimum charge is 50 GBP.

Leon