AVR-Chat

Peter Gargano wrote:

> I have a lot of Mega-16 chips in TQFP 44 pin package that I want to 
> program (before soldering them into a board).
> 
> The programmer is not a problem (STK500 or AVRISP), but what do I use 
> to physically connect to the chip for programming? I guess I'm after a 
> TQFP ZIP socket.
> 
> Peter


Yamaichi seems to make the best parts though not cheep. For example, the
64-pin socket on the STK501 sells for around $100 in small quantities. (And
that is the reason you can't buy a '501 unless you buy a '500 too.)

Found in Altera app note AN80 Jan 1999:

   Socket          Because QFP packages are more susceptible to lead
   Evaluation for  deformation,production sockets must be rigorously
   QFP Packages    qualified. Altera recommends using a burn-in socket
                   for QFP packages because of the socket’s reliability.
                   While sockets should always be qualified, Table 5
                   suggests sockets based on the number of pins and type
                   of QFP package.


   Table 5. Socket Vendor Information for QFP Packages

   Package Type                    Pins    Vendor       Part Number
   Thin quad flat pack (TQFP)       32    Yamaichi     IC51-0324-1498
   Plastic quad flat pack (PQFP)    44    Yamaichi     IC51-467-KS11258
   TQFP                             44    Yamaichi     IC51-0444-1568
   PQFP                            100    Yamaichi     IC51-1004-814-2
   Ceramic quad flat pack (CQFP)   100    Yamaichi     IC51-1004-814-2
   TQFP                            100    Yamaichi     IC51-1004-809
   PQFP                            132    Yamaichi     IC51-1324-828
   TQFP                            144    Yamaichi     IC51-1444-1354-7
   PQFP                            160    Yamaichi     IC51-1604-845-4
   PQFP                            208    Yamaichi     IC51-2084-1052-11
   Power quad flat pack (RQFP)     208    Yamaichi     IC51-2084-1052-11
    (square heat sink)
   RQFP (round heat sink)          208    Yamaichi     IC51-1052KS-13087
   CQFP                            208    Yamaichi     IC51-1509-KS14057
   RQFP (square heat sink)         240    Yamaichi     IC51-1655KS-13666
   RQFP (round heat sink)          240    Yamaichi     IC51-2404-1655-2
   RQFP                            304    Yamaichi     IC51-3044-1471-2

Here's a link to the Yamaichi data sheet:

     http://www.yamaichi.de/pdf/tb_qfp_gullwing.pdf

I don't know which dist's carry these buy a bit o' Google should show the way.

Good luck.

Bruce