SMT handy soldering question

[Sean Chen]

Hi,

I am interested in SMT handy soldering for fine pitch IC. Some people use a
solder called Water Soluble Paste and oven to handle it. My question is:
1. How many ICs can be soldered (approximate for 64pin PQFP) by a 35gm
syringe solder ?
2. Is any other cheaper solder or method can do the same thing ?

Thanks.

Sean

 

[maxfoo]

On Sun, 30 May 2004 10:10:54 -0400, "Sean Chen" <xo_chen@sympatico.ca> wrote:

Hi,

I am interested in SMT handy soldering for fine pitch IC. Some people use a
solder called Water Soluble Paste and oven to handle it. My question is:
1. How many ICs can be soldered (approximate for 64pin PQFP) by a 35gm
syringe solder ?
2. Is any other cheaper solder or method can do the same thing ?

Thanks.

Sean

Have the pcb manufacturer make you a stencil to spread the solder paste. it's
quicker and more precise than using a syringe.

Remove "HeadFromButt", before replying by email.

 

[Leon Heller]

"Sean Chen" <xo_chen@sympatico.ca> wrote in message
news:sXluc.105$Hn.37807@news20.bellglobal.com...

Hi,

I am interested in SMT handy soldering for fine pitch IC. Some people use
a
solder called Water Soluble Paste and oven to handle it. My question is:
1. How many ICs can be soldered (approximate for 64pin PQFP) by a 35gm
syringe solder ?
2. Is any other cheaper solder or method can do the same thing ?

Drag soldering works very well for fine pitch devices. I use a Metcal system
with a 'mini hoof' tip made specifically for this technique, but an ordinary
soldering iron can be used. You first apply plenty of flux to the leads. You
then apply some solder to the tip and wipe it across the leads, one side at
a time. Any excess may be cleaned up with desolder braid.

Leon

 

[Leon Heller]

"Sean Chen" <xo_chen@sympatico.ca> wrote in message
news:sXluc.105$Hn.37807@news20.bellglobal.com...

Hi,

I am interested in SMT handy soldering for fine pitch IC. Some people use
a
solder called Water Soluble Paste and oven to handle it. My question is:
1, How many ICs can be soldered (approximate for 64pin PQFP) by a 35gm
syringe solder ?
2. Is any other cheaper solder or method can do the same thing ?

Drag soldering works very well for fine pitch devices. I use a Metcal system
with a 'mini hoof' tip made specifically for this technique, but an ordinary
soldering iron can be used. You first apply plenty of flux to the leads. You
then apply some solder to the tip and wipe it across the leads, one side at
a time. Any excess may be cleaned up with desolder braid.

Leon

 

[Rene Tschaggelar]

Sean Chen wrote:

Hi,

I am interested in SMT handy soldering for fine pitch IC. Some people use a
solder called Water Soluble Paste and oven to handle it. My question is:
1. How many ICs can be soldered (approximate for 64pin PQFP) by a 35gm
syringe solder ?
2. Is any other cheaper solder or method can do the same thing ?

Yes, use 0.8mm to 1mm normal solder with some flux gel.
Yes, the tip of the iron is wider than 2 pins are appart,
but the flux drives the tin out. I also made good experiences
with a 5mm diameter concave iron. Its tin depot lasted for
32 pins in a row.

Rene
--
Ing.Buero R.Tschaggelar - http://www.ibrtses.com
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