Below is a list of the most common bismuth alloys. A listing of many others is available in our Solder Alloy Selector Guide.
|42||46Bi 34Sn 20Pb||96°C||96°C||Low temperature eutectic solder. Can be used on the same metallizations as SnPb solders. Lowest temperature alloy available as a solder paste.|
|281||58Bi 42Sn||138°C||138°C||Eutectic Pb-Free version. Low melting temperature that is good for step soldering applications.|
|282||57Bi 42Sn 1Ag||140°C||139°C||More malleable and ductile than #281.|
|97||43Sn 43Pb 14Bi||163°C||144°C||Good general purpose step soldering alloy.|
|281-338||60Sn 40Bi||170°C||138°C||General purpose Pb-Free alloy with good physical properties.|
Bismuth Blog Posts
Here’s a true story regarding the service temperature of solder joints. Yesterday, as I left work, I noticed that it felt really hot outside. I got in my car and cranked up the AC. I...
If you haven’t heard about Bi-containing (bismuth) solder alloys recently, that may change in the near future. Low-melting Bi-containing solders are now in increasing use and gaining popularity due to their lower melting temperatures—58Bi/42Sn is eutectic at 138°C and 57Bi/42Sn/1Ag melts 137-139°C (both are Pb-free alternatives). A low-temperature solder is advantageous...
I’ve always been a strong believer that a customer should not get a solder alloy that just “works” for their application, they should get the best alloy for their application. Of course, this is...
From One Engineer to Another®
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