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How easy compare dimensions and footprints for different size SMT components.

I mean how compare footprints of 0603 with 0402 size components.

For example. I want to know is there possible to use 0402 component on footprint 0603. Or some another parts.

In which software or web servises I can do it?

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It completely depends on how the footprint for the 0603 part was designed. Although there are recommended sizes for all of the solder pads for each component, some PCB designers deviate from those standards for particular reasons. In particular, the pads are often elongated towards the middle of the component precisely to allow a smaller component to be used on that footprint.

This is often done during the prototyping stage to allow maximum flexibility when working with components that are on hand.

That said: you can often make a 0402 component work on a 0603 footprint IF you are placing and soldering the component by hand. I would not expect that an automated Pick and Place machine would be able to do this.

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  • \$\begingroup\$ I know the dimensions of both footprints (0402 and 0603). How I can get model how 0402 component will be look on 0603 footprints. In which software is it possible to do that? \$\endgroup\$ – KMM Mar 2 '18 at 15:30
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    \$\begingroup\$ Simply lay the two components on top of each other in your layout software. You can then immediately see what they look like. \$\endgroup\$ – Dwayne Reid Mar 2 '18 at 15:33
  • \$\begingroup\$ Currently I don't use any software. Maybe You can suggest some ? \$\endgroup\$ – KMM Mar 2 '18 at 15:35
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    \$\begingroup\$ photoshop... draw the two components (read the datasheet) and overlay. Inkscape (same as above... I have the majority of packages drawn so I can do pseudo layouts). KiCAD or other ECAD packages \$\endgroup\$ – JonRB Mar 2 '18 at 16:02
  • \$\begingroup\$ @JonRB, I asked about special programs. Designed special for such kinds of tasks. \$\endgroup\$ – KMM Mar 2 '18 at 16:10
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If all you are looking is an image, this might be a good comparaison :

enter image description here

In this image, on the left side, on bottom is the 0402

On the right side, the blue one is the 0402

The red and blue rectangles are the pads for soldering. As you may see, they cross each other, you might be able to solder a 0402 to a 0603.

Edit : This image was made in EasyEDA, which I should recommend if you don't have a software to work with. Edit 2 : Changed the picture, the package was wrong

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    \$\begingroup\$ It is not correct models. Because the length of 0603 component is 1.6 mm (gap between pads is 0.9 mm), and length of 0402 component is 1 mm. I will try this software. Thanks \$\endgroup\$ – KMM Mar 2 '18 at 16:07
  • \$\begingroup\$ My bad. Wrong package I chose. This should be better right ? \$\endgroup\$ – cab13140 Mar 2 '18 at 16:18
  • \$\begingroup\$ It looks to me like the top left part is 0603,and bottom left is 0402. 0402 should be smaller than 0603. \$\endgroup\$ – Peter Bennett Mar 2 '18 at 16:48
  • \$\begingroup\$ That's an error. Edit : Fixed \$\endgroup\$ – cab13140 Mar 2 '18 at 19:57
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I used Eagle sowtware for comparison this two packages.

And it look like we can use 0402 component on 0603 footprint. But maybe only by hand soldering.

There is how its look 0603 footprint and two components with dimensions 0402 and 0603:

enter image description here

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