SMT resistor arrays are available in convex or concave form. What are the dis/advantages of either?
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2 Answers
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Convex have five sided terminations for easier or better soldering. The space between terminations is better with convex (generally 0.1mm). Visual checking of soldering is easier with convex, as the solder is not sucked in and hidden from view. Convex is also supposed to self align better, due to the terminators allowing side force from the solder.
I don't know that there are any advantages of concave arrays. The majority seem to be convex these days. I see some references to concave self centering, so maybe they both do.
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\$\begingroup\$ There are also many modules which have concave connections, I wonder why? \$\endgroup\$– starblueJun 14, 2011 at 17:51
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2\$\begingroup\$ @starblue - cheap! Drill a series of holes, through hole plate them (both done in the usual PCB production process) and mill half of the hole away. \$\endgroup\$– stevenvhJun 14, 2011 at 18:01
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\$\begingroup\$ For those who don't know what @starblue is talking about: i.stack.imgur.com/Mp9Vs.png \$\endgroup\$– stevenvhJul 17, 2011 at 14:41
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When manually probing the res network, concave is better, because the probe tip does not slip off or short to adjacent terminals as easily as it does for convex.
