Electronics Forum: alloy and 42 and magnetic (Page 1 of 2)

SN100C alloy positive and negatives

Electronics Forum | Mon Dec 22 15:33:42 EST 2008 | robinj

http://www.3ktehdas.com/uutiset/Next_05.pdf I hope this link helps.

Re: qfp and soic joint Problem

Electronics Forum | Tue Apr 11 20:26:16 EDT 2000 | Dave F

Jeremy: Parts assembler make leads of either Alloy 42 (Invar, whatever) or copper. The solderability of these leads are protected with eutectic or non-eutectic tin/lead solder, palladium or some palladium alloy, or gold. Cuppla things to consider:

paste Sn42/Bi58 and Lead Finish

Electronics Forum | Sat Nov 03 11:20:35 EDT 2012 | davef

EricR: There's substantial information about the properties of solder alloys on the web. Here's an example of something that I clipped from one site Alloy ||Solidus (°C)||Liquidus (C°) ||Tensile Strength (psi / MPa) Sn42 Bi58||-E-||138||8000 / 55.2

paste Sn42/Bi58 and Lead Finish

Electronics Forum | Tue Nov 06 22:37:35 EST 2012 | davef

Ryan ... "As for bismuth-based lead-free alloys, a lower melting temperature than that of tin-lead is offered together with a cost similar to that of tin [in the area of $3/lb]. Unfortunately, bismuth in soldering alloys tends to create embrittlemen

paste Sn42/Bi58 and Lead Finish

Electronics Forum | Sat Nov 03 11:08:24 EDT 2012 | anvil1021

We have experience with this alloy, but with enig and we did start with PB HASL, none of our PCBs would of course pass thermal cycling at normal temperatures with the HASL so we went to ENIG. we could thermal cycle at 100-115C with no issues. We foun

paste Sn42/Bi58 and Lead Finish

Electronics Forum | Wed Nov 07 21:36:17 EST 2012 | davef

Multiple process and rework thermal cycles are brutal on boards and components. Improving reliability of products through reducing thermal stress ends-up being a major driver to the interest in lower MP LF solders. Binary LF solders require the addit

paste Sn42/Bi58 and Lead Finish

Electronics Forum | Thu Nov 15 09:29:29 EST 2012 | anvil1021

Maybe this piece of information will help. In China (just returned from visit) there are many factories that are using a dual temperature process using SAC305 or Sn100C and 42/58. Apparently this allows them to run their through hole parts through re

paste Sn42/Bi58 and Lead Finish

Electronics Forum | Fri Nov 02 09:09:56 EDT 2012 | davef

Sure you can use it it with leaded HASL. Recognize that ... * Your Sn42/Bi58 will no linger be Sn42/Bi58 * Your leaded HASL will no longer be the same leaded HASL that walked in the door to your plant * Lead from HASL coatings can diffuse through the

paste Sn42/Bi58 and Lead Finish

Electronics Forum | Wed Nov 07 15:01:18 EST 2012 | nikyta

Thanks Dave , my question is about Spopov want to try "Lead Free" SnBi (but uses it on Leaded finishes), but is worry about its low melting point (at this point, no longer 138 degrees as he wrote, but rather in an unknown and unpredictable range bet

Your opinion about RoHS and WEEE ?

Electronics Forum | Wed Dec 15 16:38:42 EST 2004 | patrickbruneel

Here's my 10 cents Studies done in the 1980's concluded that pure tin was prone to whisker generation. A tin content lower then 70% became exempt from this phenomenon. I have never seen or done any studies on the impact lead had in reducing the pote

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