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Is there a scale drawing of SMD package sizes as a design aid? This could be useful in schematic/layout stages of a project in when deciding to trade off size vs. cost.

Vanush Vee
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  • Below answer is how I'd normally do it just be dropping onto a PCB layout, but I found a chart at http://chibi-sakura.org/images/smd_chart_v01.png that may be useful although it doesn't cover a great range of footprints. – PeterJ Jan 24 '13 at 02:43

3 Answers3

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In my experience, a printer is the most useful design aid / sanity check. For example, I use Eagle to design my PCBs, and there are reference packages available for a very large range of devices. Simply printing out the design 1:1 helps a lot. It can also help you see things like "Those parts look like they would be hard to solder/probe" and "These parts are too close/far away". It's also cheap and fast. Some manufacturers will put 1:1 footprint drawings in datasheets as well, and you can use those for reference.

As for a specific design aid, I also have the SparkFun Reference Board, which helps you see what holes, text, and common packages look like on a footprint. I find it useful at times, especially when I'm trying to figure out readability of text.

W5VO
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    If you have time, order the parts before laying out the board. This will show you something about part availability. And you can see the physical part sitting on a 1:1 printout. It's surprising how sizes all look the same in the CAD program. – markrages Jan 24 '13 at 02:44
  • @markrages Absolutely, I recommend the same. It's also a great way to catch any pin pitch, width, and size mismatch between your footprint and the actual part. – W5VO Jan 24 '13 at 05:18
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TI has a nice pdf chart for their ic packages, at actual size. Organized by pin count and package type. This is Texas Instruments centered, but the information translates well between manufacturers.

Passerby
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  • https://web.archive.org/web/20171118032809/https%3A//www.ti.com/lit/sl/sszb138a/sszb138a.pdf Also https://e2echina.ti.com/cfs-file/__key/telligent-evolution-components-attachments/00-60-00-00-00-00-18-30/TI_6C51F853AF824772015CC5884B628C51_.pdf – gwideman Dec 02 '20 at 02:06
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I know this is an old post but to add to the knowledge base (for those who google it around like me) I found the following link for SMD standard size chart

https://github.com/hemalchevli/Open-Source-PCB-Ruler

Hope this helps! :)

Rohin Kumar
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    It would be best to edit a picture or two into the answer in case the repository ever goes away. – David Feb 07 '15 at 18:10