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Daniel Kelly (AKA Jack)
Guest
Tue Jun 08, 2004 8:31 pm
Hi,
I am planning a job where I need to manually solder surface mount ICs. Some
of these ICs have pins that are only 0.5mm apart! I'm worried that this
will be impossible to solder manually.
I've looked on the web - people tell me it is possible to solder SMDs but
I'm worried their talking about older SMDs with pin-to-pin distances of more
like 1mm.
I'm a relatively skilled soldering iron user.
Is it possible to manually solder ICs with pins only 0.5mm apart?
Thanks,
Jack
Charles Schuler
Guest
Tue Jun 08, 2004 8:36 pm
"Daniel Kelly (AKA Jack)" <d.kellyNOSPAM_at_NOSPAM.ucl.ac.uk> wrote in message
news:ca57k1$1mja$1_at_uns-a.ucl.ac.uk...
Quote:
Hi,
I am planning a job where I need to manually solder surface mount ICs.
Some
of these ICs have pins that are only 0.5mm apart! I'm worried that this
will be impossible to solder manually.
I've looked on the web - people tell me it is possible to solder SMDs but
I'm worried their talking about older SMDs with pin-to-pin distances of
more
like 1mm.
I'm a relatively skilled soldering iron user.
Is it possible to manually solder ICs with pins only 0.5mm apart?
1/ Magnification
2/ Liquid flux and solder paste
3/ Hot air soldering device
4/ Practice and patience
Mariano
Guest
Tue Jun 08, 2004 9:15 pm
"Charles Schuler" <charleschuler_at_comcast.net> wrote in message
news:PPWdnXrQkMHKvlvd4p2dnA_at_comcast.com...
Quote:
1/ Magnification
2/ Liquid flux and solder paste
How do you apply the solder paste manually to the IC pins or pads ? I've
tried and the paste does not stick anywhere (before soldering). I even tried
with a syringe and ended up clogging the needle.
IMO this is the most critical part in SMD. It doesn't matter if your
placement is poor, since the solder will try to align the components with
the pads (when soldering). But you need to apply an even coat (and right
quantity) of paste to each pad. This is were I fail.
Quote:
3/ Hot air soldering device
4/ Practice and patience
Ian Stirling
Guest
Tue Jun 08, 2004 9:36 pm
In sci.electronics.design "Daniel Kelly \(AKA Jack\)" <d.kellyNOSPAM_at_nospam.ucl.ac.uk> wrote:
Quote:
Hi,
I am planning a job where I need to manually solder surface mount ICs. Some
of these ICs have pins that are only 0.5mm apart! I'm worried that this
will be impossible to solder manually.
To add to this, is it possible to buy smaller diameter than normal solder?
I've found I can make my own, with a drawplate, but it is a tedious process.
I ahven't found anywhere that stocks under .5mm multicore.
Repzak
Guest
Tue Jun 08, 2004 9:49 pm
Quote:
Is it possible to manually solder ICs with pins only 0.5mm apart?
Hey
Yearh.. i did it last week with a Tusb6250, on a home etched pcb...
u just used some quite thin solder and a lot of flux....
i thing my tip on the solder iron is 0,5 times 1mm ... but as long as there
is a lot of flux and you dosent use much solder i runs nice... and maybe use
"solder remover litze" with added flux to remove some of the solder there is
to much...
normally i just put litle solder on the solderiron tip and flux on the IC
legs, and then the flux will attrack the solder to the legs...
you could find some old computer stuff and remove some of the ic's with hot
air and use then as test, before using an expensive ic
Kasper
Mjolinor
Guest
Tue Jun 08, 2004 9:50 pm
"Ian Stirling" <root_at_mauve.demon.co.uk> wrote in message
news:40c63159$0$551$ed2619ec_at_ptn-nntp-reader02.plus.net...
Quote:
In sci.electronics.design "Daniel Kelly \(AKA Jack\)"
d.kellyNOSPAM_at_nospam.ucl.ac.uk> wrote:
Hi,
I am planning a job where I need to manually solder surface mount ICs.
Some
of these ICs have pins that are only 0.5mm apart! I'm worried that this
will be impossible to solder manually.
To add to this, is it possible to buy smaller diameter than normal solder?
I've found I can make my own, with a drawplate, but it is a tedious
process.
I ahven't found anywhere that stocks under .5mm multicore.
I just flatten it with pliers then cut it lengthways.
John Larkin
Guest
Tue Jun 08, 2004 10:35 pm
On Tue, 8 Jun 2004 17:15:07 -0400, "Mariano" <mfilippa_at_uol.com.ar>
wrote:
Quote:
"Charles Schuler" <charleschuler_at_comcast.net> wrote in message
news:PPWdnXrQkMHKvlvd4p2dnA_at_comcast.com...
1/ Magnification
2/ Liquid flux and solder paste
How do you apply the solder paste manually to the IC pins or pads ? I've
tried and the paste does not stick anywhere (before soldering). I even tried
with a syringe and ended up clogging the needle.
Paste isn't necessary. Flux the pins (liquid, maybe diluted RMA rosin
flux) and apply a small glob of solder to the tip of the iron. Run the
tip down the pins, at the pin/pad junctions; solder will magically
wick off the tip onto the pins. There are special "hoof" tips with a
beveled flat that holds a nice little pool of solder to make this work
better.
Tack two corner pins first, then just run down the line. Works great.
John
Impmon
Guest
Tue Jun 08, 2004 10:43 pm
On Tue, 8 Jun 2004 21:31:28 +0100, "Daniel Kelly \(AKA Jack\)"
<d.kellyNOSPAM_at_NOSPAM.ucl.ac.uk> wrote:
Quote:
Is it possible to manually solder ICs with pins only 0.5mm apart?
Yes it can be done, just use fine point, magnifying glass, and use
little solder.
It'd be easier to leave such tiny work to machines. Why do you need
to solder them manually?
--
To reply, replace digi.mon with tds.net
Mark (UK)
Guest
Wed Jun 09, 2004 12:30 am
Hi!
How I do it, is once the chip is removed, and you've got the bare pads,
I then use a regular iron set to a low temp, 275-300, to go over the
pads with fresh LMP solder and lots of flux, that tinns them up,the flux
helps stop them joining together, and leaves solder on each pad to help
solder the new IC legs to. Then use a hot air pencil to finally solder
the chip in place.
Yours, Mark.
Mariano wrote:
Quote:
"Charles Schuler" <charleschuler_at_comcast.net> wrote in message
news:PPWdnXrQkMHKvlvd4p2dnA_at_comcast.com...
1/ Magnification
2/ Liquid flux and solder paste
How do you apply the solder paste manually to the IC pins or pads ? I've
tried and the paste does not stick anywhere (before soldering). I even tried
with a syringe and ended up clogging the needle.
IMO this is the most critical part in SMD. It doesn't matter if your
placement is poor, since the solder will try to align the components with
the pads (when soldering). But you need to apply an even coat (and right
quantity) of paste to each pad. This is were I fail.
3/ Hot air soldering device
4/ Practice and patience
Chuck Olson
Guest
Wed Jun 09, 2004 1:57 am
"Daniel Kelly (AKA Jack)" <d.kellyNOSPAM_at_NOSPAM.ucl.ac.uk> wrote in message
news:ca57k1$1mja$1_at_uns-a.ucl.ac.uk...
Quote:
Hi,
I am planning a job where I need to manually solder surface mount ICs.
Some
of these ICs have pins that are only 0.5mm apart! I'm worried that this
will be impossible to solder manually.
I've looked on the web - people tell me it is possible to solder SMDs but
I'm worried their talking about older SMDs with pin-to-pin distances of
more
like 1mm.
I'm a relatively skilled soldering iron user.
Is it possible to manually solder ICs with pins only 0.5mm apart?
Thanks,
Jack
As mentioned, you need magnification. The first thing you should invest in
is a binocular microscope with variable power from 7 to 30 diameters and a
socket for a spotlight. If you can see it, you can do it. You should be
able to find a used one for about $200, (try Ebay) (and another $25 for the
spotlight) and it will last your whole life. You will be astounded at what
you can see with that microscope - - from examining today's almost invisible
electronic components to removing slivers and hangnails, and learning about
tiny creatures. Nobody should be without one.
The next thing you need is a soldering iron that allows your fingers to get
within about 1.25" of where the soldering is happening so that you have as
good control of the soldering tip as you have of the tip of a pencil when
you write. I find the Metcal stuff works very well, and older used systems
are available for under $100 on Ebay. Finally, you should be able to find
some 0.020" diameter solder (try Ebay or a big electronics flea market).
I made a surface-mount component clamp for my microscope consisting of a
strip of springy phosphor-bronze or beryllium-copper between two standoffs
about 3 inches apart and a piece of #12 wire soldered at the middle of the
strip to form a "T" so it pokes almost into the field of view of the
microscope, and finally a piece of #20 solid wire soldered at the end of the
#12 arm and bent down so the tip of the wire presses on the component you
want to solder right in the middle of the field of view. Just pull up on
the spring-supported #12 arm when you want to move the assembly or lift it
up onto another component.
Good luck,
Chuck
Daniel Kelly (AKA Jack)
Guest
Wed Jun 09, 2004 10:52 am
Hi,
Quote:
It'd be easier to leave such tiny work to machines. Why do you need
to solder them manually?
I'm building a one-off design for a psychology PhD experiment. I do have
access to University College London's Electrical Engineering department but
I doubt they have robots for building surface mount systems.
Oh, and I have looked long and hard for 'normal' sized chips but they just
don't exist for the sort of application I need.
Thanks,
Jack
"Impmon" <impmon_at_digi.mon> wrote in message
news:u6gcc0594a15b7ii0r6t2f6g6il4btifre_at_4ax.com...
Quote:
On Tue, 8 Jun 2004 21:31:28 +0100, "Daniel Kelly \(AKA Jack\)"
d.kellyNOSPAM_at_NOSPAM.ucl.ac.uk> wrote:
Is it possible to manually solder ICs with pins only 0.5mm apart?
Yes it can be done, just use fine point, magnifying glass, and use
little solder.
It'd be easier to leave such tiny work to machines. Why do you need
to solder them manually?
--
To reply, replace digi.mon with tds.net
Daniel Kelly (AKA Jack)
Guest
Wed Jun 09, 2004 10:52 am
Excellent, thanks so much for all the help, everyone.
Jack
"Chuck Olson" <chuckolson01_at_REMOVETHIScomcast.net> wrote in message
news:p8uxc.5829$0y.3064_at_attbi_s03...
Quote:
"Daniel Kelly (AKA Jack)" <d.kellyNOSPAM_at_NOSPAM.ucl.ac.uk> wrote in
message
news:ca57k1$1mja$1_at_uns-a.ucl.ac.uk...
Hi,
I am planning a job where I need to manually solder surface mount ICs.
Some
of these ICs have pins that are only 0.5mm apart! I'm worried that this
will be impossible to solder manually.
I've looked on the web - people tell me it is possible to solder SMDs
but
I'm worried their talking about older SMDs with pin-to-pin distances of
more
like 1mm.
I'm a relatively skilled soldering iron user.
Is it possible to manually solder ICs with pins only 0.5mm apart?
Thanks,
Jack
As mentioned, you need magnification. The first thing you should invest
in
is a binocular microscope with variable power from 7 to 30 diameters and a
socket for a spotlight. If you can see it, you can do it. You should be
able to find a used one for about $200, (try Ebay) (and another $25 for
the
spotlight) and it will last your whole life. You will be astounded at what
you can see with that microscope - - from examining today's almost
invisible
electronic components to removing slivers and hangnails, and learning
about
tiny creatures. Nobody should be without one.
The next thing you need is a soldering iron that allows your fingers to
get
within about 1.25" of where the soldering is happening so that you have as
good control of the soldering tip as you have of the tip of a pencil when
you write. I find the Metcal stuff works very well, and older used
systems
are available for under $100 on Ebay. Finally, you should be able to find
some 0.020" diameter solder (try Ebay or a big electronics flea market).
I made a surface-mount component clamp for my microscope consisting of a
strip of springy phosphor-bronze or beryllium-copper between two standoffs
about 3 inches apart and a piece of #12 wire soldered at the middle of the
strip to form a "T" so it pokes almost into the field of view of the
microscope, and finally a piece of #20 solid wire soldered at the end of
the
#12 arm and bent down so the tip of the wire presses on the component you
want to solder right in the middle of the field of view. Just pull up on
the spring-supported #12 arm when you want to move the assembly or lift it
up onto another component.
Good luck,
Chuck
Tim Auton
Guest
Wed Jun 09, 2004 3:03 pm
"Daniel Kelly \(AKA Jack\)" <d.kellyNOSPAM_at_NOSPAM.ucl.ac.uk> wrote:
Quote:
It'd be easier to leave such tiny work to machines. Why do you need
to solder them manually?
I'm building a one-off design for a psychology PhD experiment. I do have
access to University College London's Electrical Engineering department but
I doubt they have robots for building surface mount systems.
They will have technicians, lecturers and students who should know
what to do though. Ask nicely and someone might give you a
demonstration and show you the tools they have available.
Tim
--
Love is a travelator.
Product developer
Guest
Wed Jun 09, 2004 3:06 pm
"Daniel Kelly \(AKA Jack\)" <d.kellyNOSPAM_at_NOSPAM.ucl.ac.uk> wrote in message news:<ca57k1$1mja$1_at_uns-a.ucl.ac.uk>...
Quote:
Hi,
I am planning a job where I need to manually solder surface mount ICs. Some
of these ICs have pins that are only 0.5mm apart! I'm worried that this
will be impossible to solder manually.
I've looked on the web - people tell me it is possible to solder SMDs but
I'm worried their talking about older SMDs with pin-to-pin distances of more
like 1mm.
I'm a relatively skilled soldering iron user.
Is it possible to manually solder ICs with pins only 0.5mm apart?
Thanks,
Jack
Antex low watt iron with fine tip. Use a flux pen to paint flux onto
pads. Using tweezers hold the I.C. in place and tack the corner pins.
Apply just enough solder to iron tip to wet it and flick off excess.
Apply the tip very briefly to the pin end and pad and the solder will
wick into and between the pin and pad. When removing a chip without
heat simply take a sharp Xacto blade and carefully apply pressure to
the blade onto the pins as near to the chip body as possible. This
will sever the pins from the chip body making them easier for removal
without lifting a pad. Be careful to not exceed the pin / chip body
with the knife or you will risk opening a trace. I have been doing
this for years and have lost a trace or pad in over twenty years.
Daniel Kelly (AKA Jack)
Guest
Wed Jun 09, 2004 3:52 pm
Yes, good plan.
Jack
"Tim Auton" <tim.auton_at_uton.[groupSexWithoutTheY]> wrote in message
news:8c9ec0pugtdofn6mcs0l0i1ngj0q0upf82_at_4ax.com...
Quote:
"Daniel Kelly \(AKA Jack\)" <d.kellyNOSPAM_at_NOSPAM.ucl.ac.uk> wrote:
It'd be easier to leave such tiny work to machines. Why do you need
to solder them manually?
I'm building a one-off design for a psychology PhD experiment. I do have
access to University College London's Electrical Engineering department
but
I doubt they have robots for building surface mount systems.
They will have technicians, lecturers and students who should know
what to do though. Ask nicely and someone might give you a
demonstration and show you the tools they have available.
Tim
--
Love is a travelator.
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