Yes, flux helps solder move towards pins if the solder is not too much. Only
very thin layer of solder is needed before you put your chip onto the pcb.
In case you have too much solder that bridged pins you can use "solder wik"
(I can not remember exact name) to remove it. That was what we did there. We
never tried using sucker.

Raymond

-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Sebastian Garcia
Sent: December 19, 2001 1:30 PM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [EE]: Manually soldering of a LQFP package.-


Raymond,

----- Original Message -----
From: Raymond Liu <RLiu@applanix.com>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Wednesday, December 19, 2001 11:18 AM
Subject: Re: [EE]: Manually soldering of a LQFP package.-


| We was able to do this using heat gun and flux in my previous company. Of
| course solder should be in place. It's need great patient and experience
to
| get good result.
|
| Raymond


Thanx for your input. I suppose that no matters if exists small solder
bridges between pins, the flux helps for removing it. Is really this way?


Best regards,

S.-


|
| -----Original Message-----
| From: pic microcontroller discussion list
| [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Sebastian Garcia
| Sent: December 18, 2001 7:24 PM
| To: PICLIST@MITVMA.MIT.EDU
| Subject: [EE]: Manually soldering of a LQFP package.-
|
|
| Hi there!
|
|
| I will appreciate any help from an experienced lister about techniques for
| manual soldering this kind of chip.
| I got experience on manual soldering of some types of SMD IC's (using
| Chem-Wik rosin), but this one has a *very little* space between pins.
|
| The mechanical specs are:
|
| * Package: 144 pin (4x36 pin) LQFP (Low-profile QFP)
| * Distance between center of pins: 0.5 mm.
| * Pin width: 0.17 mm.
|
|
| Probably it can be done using flux or solder paste, but i have no detailed
| idea about application of these techniques.
|
| And yes, the chip is available only with this package...
|
|
| Best Regards,
|
| S.-
|
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