Is there a reason an 0805 resistor would have a different land pattern than an 0805 capacitor?

My PCB design software comes with some libraries that include some common components, like chip resistors and capacitors. I have noticed, however, that the footprint land pattern for the 0805 resistor is not identical to the 0805 capacitor. Is there a "best standard"? IPC-7351, IPC-SM-782, or what?

PCB Assembly
December 12, 2023

The current standard is IPC-7351B, which replaced IPC-7351A, IPC-7351, and IPC-SM-782 (in that order).

Mentor Graphics has a free PCB land pattern viewer for Windows (old link; they rebranded to PADS) for all of the standard parts using this standard. Each part also includes a “courtyard” layer which defines how much space needs to be left around the component for manufacturing. It is useful when you are designing high-density boards.

The standard itself consists of three versions, but for most boards, it is recommended that the “N” suffix (Nominal) footprints are used. Note that most parts do differ slightly from manufacturer recommended patterns, but in my experience (and the experiences of my board loader) these footprints do tend to meet manufacturing requirements very well.

As for you query about the 0805 resistor versus the 0805 capacitor, I suspect that the footprints have been designed to best attach the parts. While they are fairly similar in the horizontal plane, capacitors tend to be slightly higher. Thus, maybe the differences in the footprints take this into account.

Oliver Smith

Oliver is an experienced electronics engineer skilled in PCB design, analog circuits, embedded systems, and prototyping. His deep knowledge spans schematic capture, firmware coding, simulation, layout, testing, and troubleshooting. Oliver excels at taking projects from concept to mass production using his electrical design talents and mechanical aptitude.

Oliver Smith

What Others Are Asking

Approximately how many PCB layers would be needed to route a 1088 pin BGA IC?

I am designing a PCB with 1088 pin BGA IC. Haven’t handle such a big IC. I am not sure the best amount of layer.

Oliver Smith October 20, 2023

Where is the ground located in a PCB?

I am learning to design a multiple layer board for a medical device, and have a question about where the ground should place.

Oliver Smith September 25, 2023

How do PCB manufacturers prevent solder from entering vias during wave soldering?

I have some PCBs that were wave soldered but the vias still remain open, they are not filled nor plugged form what I can see. I do not see any solder on the annular rings of the vias either. How do they go about doing so?

Oliver Smith November 3, 2023