"ElderUberGeek" <aribloch@gmail.com> writes:
> Anyone know of a source for 32 pin LQFP sockets that can be PCB mounted
> for prototyping?

Yamaichi probably makes one.  Prepare to spend a good bit of money.

ElderUberGeek wrote:
> Anyone know of a source for 32 pin LQFP sockets that can be PCB mounted
> for prototyping?
> The only one I could find is:
> http://www.epboard.com/eproducts/protoadapter1.htm
> but it is darn expensive......
> 

That is adapter. You need to solder the part on it. The link you
provided is *very* expensive, but I could not find this particular type
TQFP32. I sell some adapters like LQFP48 or LQFP64 for small fraction of
that.

Maybe you are looking for this gadget:

http://www.kanda.com/index.php3?cs=1&bc=direct&bw=%2Fbrowse.php3%3Fman%3D30

	Roman

On Friday, in article
     <AYAnh.42497$KT2.19736@newsfe2-win.ntli.net>
     peter.smith8380@ntlworld.com "PeteS" wrote:

>ElderUberGeek wrote:
>> Anyone know of a source for 32 pin LQFP sockets that can be PCB mounted
>> for prototyping?
>> The only one I could find is:
>> http://www.epboard.com/eproducts/protoadapter1.htm
>> but it is darn expensive......
>> 
>
>Unless you are dealing with a *very* expensive chip, it's cheaper to :
>
>a. Add in-system programming and solder the thing down for each board
>OR
>b. Make a small adapter board with an ISP header that plugs into the 
>target board.

That is if the part needs programming.

>I've used the adapters and they can get incredibly expensive (although 
>if that's what you really need there's no substitute - such as when you 
>only have *one* sample chip).

Or building a tester for devices, or building the internal porduction
programmer (or programming adapter).

Unless the part or the PCBs are expensive or large, just solder the
thing down. I rarely socket devices as it reduces points of failure.

-- 
Paul Carpenter          | paul@pcserviceselectronics.co.uk
<http://www.pcserviceselectronics.co.uk/>    PC Services
<http://www.gnuh8.org.uk/>              GNU H8 & mailing list info
<http://www.badweb.org.uk/>             For those web sites you hate

ElderUberGeek wrote:
> Anyone know of a source for 32 pin LQFP sockets that can be PCB mounted
> for prototyping?
> The only one I could find is:
> http://www.epboard.com/eproducts/protoadapter1.htm
> but it is darn expensive......
> 

Unless you are dealing with a *very* expensive chip, it's cheaper to :

a. Add in-system programming and solder the thing down for each board
OR
b. Make a small adapter board with an ISP header that plugs into the 
target board.

I've used the adapters and they can get incredibly expensive (although 
if that's what you really need there's no substitute - such as when you 
only have *one* sample chip).

Cheers

PeteS

larwe wrote:
> ElderUberGeek wrote:
>
> > But meanwhile, for the few (several?) prototypes I need to make, I am
> > looking for some type of "socket" just like you have regular IC sockets
> > (one that has pins for the PCB and you place the chip inside....). Does
> > this exist?
>
> For LQFPs, I believe your only option that works the way you described
> will be a ZIF socket intended for test/burner type applications. These
> are staggeringly expensive as I indicated, and only available from a
> couple of vendors.
>
> The adapter board you indicated is really cheap compared to buying a
> socket. The downside is you have to solder the chip down to the
> adapter, which is why I'm puzzled - if the goal is just to have one or
> two chips, and move them between a bunch of different boards, this will
> work. But if the reason you need it socketed is that you have to pull
> it out and put it in a burner or something, the ZIF socket is the only
> option for you.

I agree with you, but I guess the idea is that if for some reason the
test board goes bad, you do not have to start de-soldering the chip but
could just pull it out. By the way I don't know how sensitive these
things are, I have never soldered an LQPF before, thus I also like the
idea of just plugging it in.....

ElderUberGeek wrote:

> But meanwhile, for the few (several?) prototypes I need to make, I am
> looking for some type of "socket" just like you have regular IC sockets
> (one that has pins for the PCB and you place the chip inside....). Does
> this exist?

For LQFPs, I believe your only option that works the way you described
will be a ZIF socket intended for test/burner type applications. These
are staggeringly expensive as I indicated, and only available from a
couple of vendors.

The adapter board you indicated is really cheap compared to buying a
socket. The downside is you have to solder the chip down to the
adapter, which is why I'm puzzled - if the goal is just to have one or
two chips, and move them between a bunch of different boards, this will
work. But if the reason you need it socketed is that you have to pull
it out and put it in a burner or something, the ZIF socket is the only
option for you.

larwe wrote:
> ElderUberGeek wrote:
> > Anyone know of a source for 32 pin LQFP sockets that can be PCB mounted
> > for prototyping?
> > The only one I could find is:
> > http://www.epboard.com/eproducts/protoadapter1.htm
>
> Huh? That's not a socket, it's a board adapter. The LQFP is soldered
> down. If you just need to move one chip between different baseboards,
> this is okay. If you need to pull the chip out and put it in a
> programmer, this is not so okay.
>
> I'd also call the board to which you linked real cheap :) A ZIF LQFP
> socket is >$120. Look at Yamaichi, among others.

Sorry, I should have defined the problem better.
There is a 32-pin LQPF I would like to test in a prototype.
If we use it in production, of course it will be directly mounted on to
the PCB.
But meanwhile, for the few (several?) prototypes I need to make, I am
looking for some type of "socket" just like you have regular IC sockets
(one that has pins for the PCB and you place the chip inside....). Does
this exist?

ElderUberGeek wrote:
> Anyone know of a source for 32 pin LQFP sockets that can be PCB mounted
> for prototyping?
> The only one I could find is:
> http://www.epboard.com/eproducts/protoadapter1.htm

Huh? That's not a socket, it's a board adapter. The LQFP is soldered
down. If you just need to move one chip between different baseboards,
this is okay. If you need to pull the chip out and put it in a
programmer, this is not so okay.

I'd also call the board to which you linked real cheap :) A ZIF LQFP
socket is >$120. Look at Yamaichi, among others.

Anyone know of a source for 32 pin LQFP sockets that can be PCB mounted
for prototyping?
The only one I could find is:
http://www.epboard.com/eproducts/protoadapter1.htm
but it is darn expensive......