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Half-completed manual soldering of surface mount MQFP integrated circuit
 

 

 

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Summary

Description
English: This image shows a 32-pin MQFP (Metric Quad Flat Pack) surface mount integrated circuit half way through the manual soldering process. 16 pins have been soldered with wire wrap wire, which will later be fixed into a DIP chip holder.
???: ??? ???? 32? MQFP ?
Date 2005-10-15 (original upload date)
Source Transfered from en.wikipedia
Author Photo taken by Mike1024 at en.wikipedia
Permission
(Reusing this file)
PD-icon.svg This work has been released into the public domain by its author, Mike1024 at the English Wikipedia project. This applies worldwide.

In case this is not legally possible:
Mike1024 grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.


Technique/advice

1) If you must manually solder an IC, make it one with legs that stick out. ICs like this one aren't very solderable, because the pads are 'printed on', so if you heat them up too much/too many times, you'll find the pad disappears... I found that, anyway.

2) You need the IC held in place really securely. I did this by en:blu-tacking it to a lump of steel. Double-sided sticky tape also works.

3) You need to solder left to right, so you can hold the iron in your best hand and not foul pins you've already done.

4) Make sure you have a sharp en:soldering iron and something to clean it on - usually a wet sponge.

5) Strip the wire-wrap wire, put a dab of solder on the end, put the dab of solder against the IC pin, then touch your soldering iron against the two of them. This should melt the solder onto the pin, securing the wire in place. Don't bother trying to tin the pin or anything; they're too small.

6) If you've done it right, you'll be able to move the wire a bit and it will bend on the wire, not at the solder joint. Inspect it with a good magnifying glass to avoid solder bridging. Check it regularly; you want to fix your mistakes before you put the next wire on.

Original upload log

The original description page is/was here. All following user names refer to en.wikipedia.

  • 2005-10-15 14:58 Mike1024 1024×1024×8 (105776 bytes) ==Summary== This image shows a 32-pin MQFP (Metric Quad Flat Pack) [[surface mount]] [[integrated circuit]] half way through the manual [[soldering]] process. 16 pins have been soldered with [[wire wrap]] wire, which will later be fixed into a DIP chip ho


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