On Friday 01 September 2006 17:55, Dieter wrote: > For the most part I agree. De-soldering a DIP from a board without > destroying it is the exception. The legs love to stick to the walls of the > hole, even with the use of solder-suckers and solder-wick. And even > high-quality boards with experienced rework people are only good for about > 5 replacements. With a low quality board you're lucky to replace a chip > once without destroying the lands. So I never solder DIPs to a board, I > always use sockets.
True: trying to replace a DIP by the 'traditional' technique (desoldering each pin with a sucker and then pulling the chip off) almost always destroys the PCB. However, replacing a DIP is actually quite easy, if you don't want to reuse the original DIP. 1) Clamp the board (in a vice, usually) so the package body is downwards and the pins upwards 2) Get a *high power* soldering iron and flood all the pins of the package with a giant blob of solder. Stroke the iron backwards and forwards, keeping all the pins nice and hot. 3) The DIP will fall out under its own weight, lubricated by the molten solder. Throw it out, it'll almost certainly be wrecked. 4) Get some braid and a flux pen and carefully clean the footprint. However, this is impossible (or at least very tricky) to do for packages with more than 16 pins, unless you're quite experienced at this technique. If someone who *doesn't* have a lot of rework experience is going to be expected to need to replace the chip, fit a DIP socket. ;) Peter -- Fisher Society publicity officer http://tinyurl.com/o39w2 CUSBC novices, match and league secretary http://tinyurl.com/mwrc9 Quake II build tools maintainer http://tinyurl.com/fkldd v3sw6YChw7$ln3pr6$ck3ma8u7+Lw3+2m0l7Ci6e4+8t4Gb8en6g6Pa2Xs5Mr4p4 hackerkey.com
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