convex vs concave resistor arrays

Question

SMT resistor arrays are available in convex or concave form. What are the dis/advantages of either?

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score 10 · Accepted Answer · answered Jun 14 '11 at 15:31

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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.

answered Jun 14 '11 at 15:31

Joe

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There are also many modules which have concave connections, I wonder why? – starblue Jun 14 '11 at 17:51
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@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. – stevenvh Jun 14 '11 at 18:01
For those who don't know what @starblue is talking about: http://i.stack.imgur.com/Mp9Vs.png – stevenvh Jul 17 '11 at 14:41

score 5 · Answer 2 · answered May 23 '17 at 19:09

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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.

answered May 23 '17 at 19:09

C. A. Scott

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convex vs concave resistor arrays

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