What is the proper zero orientation for a SMT LED?

According to IPC-7351, the cathode should be on the left for a molded diode. However, when I use component wizard of my suppliers to create a diode, it places the cathode (K) on the right. Does it depend on the manufacturer? How does the assembly house know which way is correct?

We prefer cathode on the left, as per the standard, but typically rely on silkscreen or customer input to determine the proper orientation.

Read More: PCB Layout Services

#PCB Assembly

Oliver Smith

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

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.

What Others Are Asking

Why are power supplies almost always made using through hole components?

Every computer PSU I’ve taken apart uses through hole components, though occasionally (not in all cases) surface mount components are found on the bottom. Don’t these have to be hand assembled? If so, why are they still doing this? even though labour costs are low in China, it still must cost less for a machine to pick and place SMT stuff.

How can I handle missing solder mask opening on PCB footprint?

I have three through-hole PCBs that are missing front and back solder mask openings for two of the components. The solder mask (usually green) is covering the front and back solder pads. All other pads for all other parts are exposed. Is there a good way to remove the solder mask so that I can solder the components to the board?

Read Detailed Advice From Blog Articles

9 Common SMD Components You Must Know
Will Li

9 Common SMD Components You Must Know

I’ve always been fascinated by the tiny electronic components that power our modern devices. As I’ve learned more about electronics, I discovered the world of

Scroll to Top