How to Etch a PCB with PCB Etching Process Steps & Video

PCB etching process is one of the major steps in the chemical processing of subtractive printed circuit board. It is the removal of copper, to achieve the desired circuit patterns. In PCB etching process, all copper is removed except the circuitry that is protected by the tin plating applied during the previous treatment in PCB manufacture. The tin is then stripped and the copper is cleaned and the newly prepared circuit is ready for solder mask.


PCB Etching Process.jpg

PCB Etching Process


It is easy and fun to etch small number of simple pcb boards by yourself at home.

 

1. The Benefits of Etch a PCB by Yourself:


 

However, it may occur some issues during the pcb etching process, and because of dangerous chemicals and power tools, you should protect yourself by some methods.

 

2. Some Issues While Etching:


 

3. Protect Yourself While Etching:


 

4. How to Etch a PCB


If you’re interested in etching pcb boards, you can watch this video, which will tell you how to etch a PCB. We hope it can help you go more smoothly.



5. Types of PCB Etching Process

Typically, the PCB etching process can be divided into two types: chemical etch and laser etch.


Chemical Etch

Chemical etching is usually done with ammonium per sulphate or ferric chloride

For PTH (Plate-through Hole), additional steps of electroless deposition are done after the holes are drilled, then copper is electroplated to build up the thickness, the boards are screened, and plated with tin/lead. The tin/lead becomes the resist leaving the bare copper to be etched away.


Laser Etch

A new process creating new standards and the demise of the chemical process is plasma etch. In addition to no etch-back, this process also eliminates imaging, or film error using a direct imaging process, which transfers the layer image directly to the material.


6. Some Examples of PCB Etching Process:


Example 1


pcb layout drench.png

pcb greasy and dried layout

brush pcb

6368107327188481264479165.png


Example 2


Step 1. Masking the Board


Masking the PCB Board


Step 2. Etching the Board


Etching the PCB Board


Step 3. Removing the Resist




Step 4. Finishing Touches


Finishing Touches


Example 3


Step 1. Transfer the Layout to the Board


Transfer the Layout to the Board.png


Step 2. The Etching Process


Etching Process

Etching Process.jpg