Embedded Systems Conference
Breaking News
Blog

Which PCB Connectors Are Best?

NO RATINGS
Page 1 / 2 Next >
View Comments: Newest First | Oldest First | Threaded View
<<   <   Page 4 / 4
antedeluvian
User Rank
Author
Re: contact material
antedeluvian   1/18/2014 11:44:48 AM
NO RATINGS
Sanjib

Did you ever came across cases where the contact material of the PCB connector was different from the contact material of the mating connector that the user was using unknowingly? What might happen if the PCB connector has gold plated contacts when the mating connector had tinned contacts?

That is a really interesting question. I must admit I have never come across a contact material issue other than how it relates to thermocouples. I don't believe I have ever seen terminal blocks (non-pluggable) with gold plating. Gold plating is available on pluggable connectors "for very small signals" (quote from a Weidmuller catalog).

IIRC I have seen a connector degrade as a result of oxidation during storage and as a result when installed the contact resistance was high enough to cause problems, but that has only happened once in over 20 years and was attributed to a production quality issue.

Mxing and matching terminal platings might be more a question for someone with electro-chemical or metalurgical knowledge- I certainly can only answer with "I don't know". I will see if I can find someone with an answer. I can say that with dissimilar metals you will get a thermocouple junction and there probably will be a uV source in series with the wire. This would not be that different to other metal junctions in the signal path- wire/connector or connector/solder.

 

 

Sanjib.A
User Rank
Author
contact material
Sanjib.A   1/18/2014 9:59:55 AM
NO RATINGS
I have a question regarding the contact material. Did you ever came across cases where the contact material of the PCB connector was different from the contact material of the mating connector that the user was using unknowingly? What might happen if the PCB connector has gold plated contacts when the mating connector had tinned contacts? A poor contact resistance and faster wear & tear? If the current is in the order of 20-30 mA, even then would there be reliability issues?

<<   <   Page 4 / 4
Flash Poll
April 2015 Cartoon Caption Contest: The Mighty Hamster
April 2015 Cartoon Caption Contest: The Mighty Hamster
Of all the exhibits in the Pre-Apocalypse Era Museum, Breek was always in awe of the unearthed details and true-to-scale reproduction of a technological creation space that the long gone humans had once inhabited.
141 comments
Like Us on Facebook

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
EE Times on Twitter
EE Times Twitter Feed