Can I design SMD elements on the back of THT?

I'm designing a PCB right now and found out I can save a lot of space using the back of THT elements. Is it legit to design like that? Are there any problems that might occur? 

If you want to meet CE requirements for noise immunity and emissions, a two-layer board would help a lot.

Generally speaking, there is no problem with putting components on both sides of the board, in the same place. If you had a two (or more) layer board, you’d probably want to put a ground or power plane between them. However, you can’t do that with a single-layer board. So you should watch out for a fast digital chip interfering with an analog circuit. It would be inadvisable.

For example, put a microcontroller on one side and a high input impedance buffer on the other. But putting decoupling caps opposite the chip is probably a good plan.

Read More: Telecom Electronics Manufacturing

#PCB Design

Picture of 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.
Picture of 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

Can HASL finish be used for castellated pads?

I am designing a PCB that uses castellated edges to connect to the parent board. I would like to use hot air solder leveling finish to save on costs for prototyping, but I am concerned that the non-planar surfaces of the module may pose assembly issues. Is it common at all to use HASL for castellated boards, or do I need Electroless Nickel Immersion Gold to ensure successful assembly?

How long should it take to charge for new watches?

I bought 20 watches samples from a PCBA factory and plan to do some test on them. However, there is no power in its original state. How long should it take to charge for the watches in its original state?

Why should we bake bare PCB?

The assembly note states: Bake bare PCBs in a clean and well ventilated oven prior to assembly at 125*C for 24 hours. Why is this necessary?

Read Detailed Advice From Blog Articles

Strategies on Designing PCB Layout
Ryan Chan

Strategies on Designing PCB Layout

Why PCB Layout is Needed We use Printed Circuit Boards (PCB) for connecting electronic components by using conductive tracks. This allows for prototyping electric circuits

How to Design PCB Antenna Like a Pro
Ryan Chan

How to Design PCB Antenna Like a Pro?

Antennas play a critical role in any wireless system, which is used to transmit and receive electromagnetic signals that carry data. As electronics continue getting

The Ultimate Guide to PCB Layout Design
Ryan Chan

The Ultimate Guide to PCB Layout Design

PCB layout design is a key step in the manufacture of circuit boards. A reasonable PCB layout is conducive to controlling the production cost and

Scroll to Top