Resistance Shift with Lead free

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Any metalurgists out there? I take the resistance value of a... - Jan 19, 2006 by Steve

Steve, How do you measure the resistance is it by probing... - Jan 20, 2006 by Patrick Bruneel

Is it possible you are producing a Kelvin junction? ... - Jan 21, 2006 by

Steve

#39218

Resistance Shift with Lead free | 19 January, 2006

Any metalurgists out there? I take the resistance value of a metal oxide substrate made of silver or gold or manganese. I then solder with 63/37 and the resistance changes but not dramatically. I then solder with Lead free SAC305 and the resistance changes immensly. Any suggestions as to why? and or suggestion for lead free alloy that will not have this effect?

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Patrick Bruneel

#39235

Resistance Shift with Lead free | 20 January, 2006

Steve,

How do you measure the resistance is it by probing the surface? Concerning the alloy there is a straightforward linear correlation between the tin content and the electrical conductivity of the alloy. The higher the tin content in the alloy, the better the electrical conductivity. But if you measure resistance by surface probing, the lead free alloys oxidize significantly faster compared to leaded alloys and since tin oxide is an insulator you will see an increase in resistivity.

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KEN

#39256

Resistance Shift with Lead free | 21 January, 2006

Is it possible you are producing a Kelvin junction?

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