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The best solder for electronics

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mrpackethead:

--- Quote from: magic on July 06, 2019, 06:52:45 am ---
--- Quote from: mrpackethead on July 06, 2019, 01:57:25 am ---IF you are worried about whiskers when using Pb Free Solder, then dont' use a Pure Tin plated PCB.   But that has'tn been really done for years.   ENIG, or HASL finish, and you wont' get whiskers.
--- End quote ---
Won't they grow out of the solder blob rather than the PCB footprint?

--- End quote ---

No.  they occur when you have pure metals ( Zinc, Tin are most common ) that are under compression.   Much myth about solder causeing the problem.   

http://flex.iconnect007.media/index.php/article/54212/get-smart-tin-whiskers-eliminated/54215/?skin=flex

mrpackethead:
FYI. I prettyu much use Gold ENIG PCB exclusively.  the reasons lot for whiskers, its for flatness.

magic:

--- Quote from: mrpackethead on July 06, 2019, 08:52:46 am ---No.  they occur when you have pure metals ( Zinc, Tin are most common ) that are under compression.   Much myth about solder causeing the problem.   

http://flex.iconnect007.media/index.php/article/54212/get-smart-tin-whiskers-eliminated/54215/?skin=flex

--- End quote ---
Your link seems to contradict you. It says they nickel-plate not just bare PCBs and components but wholly soldered assemblies to prevent whisker growth.

tooki:

--- Quote from: Monkeh on July 06, 2019, 12:36:58 am ---
--- Quote from: tooki on July 05, 2019, 11:14:07 pm ---
--- Quote from: magic on July 05, 2019, 11:46:21 am ---You guys are nuts with that eutectic obsession :scared:

--- End quote ---
It's not an "obsession" to have a preference for the superior product, especially when the added cost is truly insignificant.

--- End quote ---
That very much depends on your relative availability..

Pretty much the same solder I use daily: https://uk.farnell.com/multicore-loctite/3096525-m/solder-wire-60-40-180-deg-250g/dp/5090787
A eutectic (not 63/37 because they don't stock it..) equivalent: https://uk.farnell.com/multicore-loctite/dlmp24-250g-reel/solder-wire-lmp-0-56mm-250g/dp/419552

Truly insignificant, merely 50% more for 2% better solder.

--- End quote ---
I was specifically comparing 60/40 to 63/37. It’s not at all fair to try and discredit my statement by comparing the price of 62/36/2, which is far more expensive.

That YOU can’t get 63/37 as easily is not relevant here. The OP is in USA, where it’s widely available. Looking on Digi-Key*, using 0.8mm (0.031-0.032”) RA solder, a lb of Kester is $38.01 for 60/40 vs $39.67 for 63/37. From MG Chemicals, both cost exactly $45.26 for a lb — literally not one cent higher. And with Multicore, for 500g reels, it’s $35.21 for the 63/37 vs $36.01 for 60/40, so actually cheaper for the eutectic.

So yeah, when I say the added cost is “insignificant”, that’s an absolutely reasonable way to describe it.



*does anyone here know whether Digi-Key will ship leaded solder to Europe? If so, that’s by far the easiest way to get a great selection at low cost.

Audioguru:
Doesn't Farnell (Element 14) sell solder in Europe at low cost?
EDIT: In Canada there is a store and its staff from India. They sell low cost surplus electronics things that companies don't need then sell to them. I buy American solder there and the tip for my Weller soldering iron. Name brand new ICs are also sold at low cost. I bought new AC adapters and clock radios for only $1.75CAN. In one of the clock radios I replaced a few coupling capacitors with higher values for good bass and connected it to a hifi speaker. It sounds great.

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