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Old 10th December 2004, 06:45 AM   #11
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U can use a socket for specific reasons as all have mentioned, but after u have done the final decision, solder it. U will have tarnished metal (even on gold plated) within some days, due to the weather in my/ur part of India and u will have associated problems.

Also that a soldered IC is heatsinked (sort of)

Gajanan Phadte
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Old 10th December 2004, 07:33 AM   #12
digi01 is offline digi01  China
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another one,i think it is more easy to rolling the chips.
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Old 10th December 2004, 07:58 AM   #13
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digi, the price tag of such and it's big

Such socket is only practical for a progamming device and when it is about 100's or 1000's of insertions.
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Old 10th December 2004, 05:10 PM   #14
Roushon is offline Roushon  India
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i really appreciate all of your suggestions to my question.

my problem was that i am a bit hesitant to solder directlly an expensive ic like opa627. i am afraid that i can damage it. i need to purchase some good soldering station for this. i will also see if i can find the round holed socket in mumbai. but for ad8620 i have no choice but soldering; it is surface mount type.

thanks.
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Old 10th December 2004, 05:46 PM   #15
Markje is offline Markje  Netherlands
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Then use a socket... easy. If you're afraid you damage it, don't solder directly.

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Old 10th December 2004, 06:35 PM   #16
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Quote:
Originally posted by Roushon
but for ad8620 i have no choice but soldering; it is surface mount type.
That will be your test. If you can solder a surface mount IC and not damage it, you are certainly able to solder any other IC.

Use a 30W solder base and thin wire solder. Soldering an IC is very fast, just twist at least three pins so the chip will not move while you solder.


Carlos
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Old 10th December 2004, 10:58 PM   #17
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for something like the AD8620 I would suggest putting a small dab of solder on one of the PCB tabs (not a glob, a dab -- does that translate ?) tack one end of the chip on this pad -- the rest is easy.

for SMT I use a 7 watt Weller Pencil or the Hakko -- solder paste from Kester works very well -- apply with a needle or very fine tweezers.
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Old 11th December 2004, 12:22 AM   #18
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Quote:
Originally posted by jackinnj

for SMT I use a 7 watt Weller Pencil or the Hakko -- solder paste from Kester works very well -- apply with a needle or very fine tweezers.
What temperature you set on the Hakko? I have a 936, but never soldered SMDs yet.

Why do you want solder paste? Don't modern solders have its own?


Carlos
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Old 11th December 2004, 12:40 AM   #19
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Quote:
Originally posted by carlmart

Why do you want solder paste? Don't modern solders have its own?
Carlos
with the Hakko I use the needle tip - fits in between the pins of an SOIC device.

the Kester "solder paste" I use is actually small balls (tiny) of solder suspended in an emulsion -- the consistency of 5-minute epoxy -- as soon as it is touched by the iron it melts.

for those who were wondering, the only small balls in this household are those in the Kester solder.
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Old 11th December 2004, 04:21 AM   #20
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Quote:
my problem was that i am a bit hesitant to solder directlly an expensive ic like opa627. I am afraid...
Remember soldering is best done with all four touching each other
1 Iron tip 2.solder Lead 3.component pin and 4. PCB pad
No flux necessary since it is present in the solder

If you are going to fix this IC on a socket, then u will NOT get it to work what it is worth. I know U are not going to believe me now.

If u are not confident of soldring it, then I suggest u follow as below
1)Clean all the PCB pads that the IC goes into. (should be shiny)
2)Solder the pads on the PCB,
and then clean and clear the holes.
Insert the IC and solder it with clean and solder wetted iron tip

If u are afraid of damaging the IC due to static, it is IMPOSSIBLE with such high humidity(80%+). Only care that has to be taken is that u use less wattage soldering iron and follow the above method. U will not fail.

The soldering irons like weller(costs thousands) with iron coated tips are difficult to solder with since the tip does not get wetted easily.

As for the SMD IC, it is much easier with a cheap iron like TONY but the bit should be of chisel shape. If it is not, then file it to make like one(3-4 mm chisel). Don't worry it's just copper with coating for cosmetic purpose.
Now follow 1 and 2 above.
Next get rid of the globs and make them dabs by using a solder wick.
Don't have solder wick, then use your imagination.
After this, place the IC properly and glue it at the bottom using small drop of rubber based glue(quickfix, fevibond), in the middle, bottom of the IC.
Now solder as follows
Wet the iron tip (with solder This applies to all above wetting)
Now place the iron tip on the multiple pins. This will solder the pins below and after a second or so move the iron away from the IC but still touching the pins. This will take away the excess solder.
Repeat for all the pins.
After soldering the IC if u find a bridge between the pins, use solder wick or imagination to correct.
Inspect the job with a lens and move a sharp knife between all the pins to get rid of any invisible solder.

Remember, u don't need a good soldering iron but skill and say u are going to get it

Best of luck

Gajanan Phadte
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