36PB/62Sn/2Ag Vs 63Sn/37Pb

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Hi, would like to get good info on the above solder pas... - Aug 14, 2001 by

2% silver will be a little shinier. [Some inspectors hate t... - Aug 14, 2001 by davef

Basic understanding, 1) the 2% silver (Ag) gives better s... - Aug 14, 2001 by mugen

Say isn't creep a more key issue, rather than strength? ... - Aug 14, 2001 by davef

true.... tata why the elongation% is there..... ... - Aug 14, 2001 by mugen

But isn't elongation more of a quantification of ductility t... - Aug 14, 2001 by davef

Say din't someone previously claim, "Dave F" stands for : ... - Aug 16, 2001 by mugen

Just feel relieved that we didn't go to the matt on the use ... - Aug 16, 2001 by davef

Pete

#17197

36PB/62Sn/2Ag Vs 63Sn/37Pb | 14 August, 2001

Hi,

would like to get good info on the above solder paste metal content regarding their advantage and disadvantage against each other and their effect on fine pitch solderability.

regards,

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davef

#17200

36PB/62Sn/2Ag Vs 63Sn/37Pb | 14 August, 2001

2% silver will be a little shinier. [Some inspectors hate that.] After that differences get murkier.

Some people believe that 2% silver does something er other to scavange gold and silver to produce a less brittle connection. We have never seen evidence of that.

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mugen

#17201

36PB/62Sn/2Ag Vs 63Sn/37Pb | 14 August, 2001

Basic understanding,

1) the 2% silver (Ag) gives better shine *joint surface*.

2) Ag improves stength & fatigue resistance of solder joints

3) reduces leech-out of silver from silver-base substrates (eg of such silver-base surface contact: metallized faces of CAP & RES)

4) Extract from a book:

Sn63/Pb37 Tensile Strength : 4.0 tons/sq.inch @20 deg-C Elongation : 50%

Sn63/Pb35/Ag2 Tensile Strength : 4.2 tons/sq.inch @20 deg-C Elongation : 40%

This means better mechanical performance....