Etching PCB - Minimum feature size?

Community PCB Design
1

I’m wanting to take my first stab at etching my own PCBs. I would like to create a simple breakout board for a 0.5mm pitch QFN 32 part. Is this pitch possible to achieve with the toner transfer / copper clad etching process? The exposed paddle (center pad) needs to be electrically connected as well, but is not an issue as it is in common with one of the pads.

What are some of the minimum trace widths people are experiencing with this method, and what can I expect?

I appreciate any input!

-Nate

2

I don’t have any problems with 8/8 mil design rules using photo-etch, and have done 5/5 mil as a test. I’ve made boards with 0.5 mm pad spacing for QFP and QFN parts.

3

Toner Transfer is more prone to technique then photo etch. You may be able to do it no problem, you may have a difficult time getting decent results.

I have no problem with doing boards with QFP, QFN, and small pitch parts using toner transfer, but I’ve seen other people really struggle with getting results.