Modern SMD Packing

Published:2011/8/15 1:53:00 Author:Amy From:SeekIC

Paul Goossens



Parts in SMD packages are becoming more and more frequent in DIY circuits. Sometimes they are used because of bet­ter performance, usually as a conse­quence of the shorter PCB traces between the various parts. The result of this is a lower self-inductance so the circuit exhibits better RF behavior.

Another reason components in an SMD package are selected is simply because the equivalent parts in a ’through-hole’ pack­age are no longer being manufactured. All those different packages have naturally resulted in several new standards for pack­ages. Here we show a number of com­mon SMD packages with three terminals.

In particular, note the difference in dimen­sions for the various packages. Arguably a SOT346 package is a lot easier to solder than a SOT490 package. It is obvi­ous then, that a SOT883 package is going to be the most difficult to solder. Not only is the package extremely small, but in addition, the terminals are under­neath. This means that it cannot be sol­dered with a soldering iron. To solder these, you would have to resort to using a hot plate, an iron or even better: an SMD oven.

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