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Characteristics of modern solder mixtures (leadfree)

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nightfire:
Preface: I am living in germany/EU, so due to several reasons, including availibilty of products, leadfree solder is in most cases the way to go for new projects.
I know of the differences to leaded solder (and have some small spools around for repair usage), but would like to condense some knowledge about the characteristics of solder, that might not been clear in the glossy datasheets from the manufacturer.
Basically I see that there are several "families" or approaches to leadfree solder, including flux types (Kolophonium replacements).

From what I have read, two of the prominent families are something around the SAC305 sort of solder, with some percentages of silver in it, and the silver-free stuff like 0,3 CU based stuff. Then comes the Fuji patented SN100NiGe stuff, with its eutectic behaviour.

Actually I stumbled on ebay over some SN100Ag (MA-S) solder, that was described as SAC307- that looked at me with a competetive price, so I am a bit curious what those mixtures can do or how they behave in general.

Are there any ressources on the web available, with some generic comparison chart, that provide information about things like temperature needed, eutectic behaviour, flow characteristics?
Or could we make some generic list of the different families of leadfree solder these days?

Ungolian:
I'm kind of curious about this too.  I'm currently using Alpha lead-free, and I'd like to find something with a lower reflow temperature.  Without physically going through every brand, it would be nice if that information was on a chart somewhere.

thm_w:
https://aimsolder.com/technical-articles/lead-free-alloy-development
https://www.eevblog.com/forum/chat/which-type-of-lead-free-solder-is-the-best/
https://www.eevblog.com/forum/manufacture/good-lead-free-solder-for-hand-soldering/
https://www.eevblog.com/forum/chat/do-you-still-use-leaded-solder-i-was-today-refused-to-buy-it/


--- Quote from: Ungolian on December 04, 2022, 09:28:38 pm ---I'm kind of curious about this too.  I'm currently using Alpha lead-free, and I'd like to find something with a lower reflow temperature.  Without physically going through every brand, it would be nice if that information was on a chart somewhere.

--- End quote ---

Which specific alpha solder, SAC305? You'd basically have to go to something with bismuth or indium to get anything lower.
AFAIK most leadfree is going to all be 217C or more.

jonpaul:
SAC305 was an early solution, costly and not optimal.

Most products switched to SN100C.

Patent expired long ago, vendors are AIM, many others.

For repair or DIY, leaded eutectic is far superior, 63/37 leaded.

Ham radio flea markets, estate sales, ebay, good sources.

Jon

tooki:
I’ve been very happy with SN100NiGe solder.

In Germany, a really affordable option is Felder, which Reichelt sells at excellent prices. I’ve used this one and far preferred it over Stannol: https://www.reichelt.de/ch/de/loetzinn-bleifrei-mit-kupferanteil-0-75-mm-250-g-lz-f4-bf-0-75250-p258991.html

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