New to PCB design

Thread Starter

TimothyFelt

Joined Jun 17, 2025
4
I was wondering if some experienced pcb designers could help me analyze and verify my board that I made. It is a custom motor driver board that will drive a motor with a stall current of 1.5 amps. It runs between 7-13 volts but ideally it runs at 12 volts. I want to use a stm32f072 microcontroller to control the motors and the board has an output of 3.3 volts. I will include the files to look over. Any advice is welcome! The attached are all the gerber files.
1750176948005.png
1750176998804.png
 

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Ian0

Joined Aug 7, 2020
13,131
Your object in this exercise is not to challenge to pcb company to see how fine clearances they can actually manufacture!
First, see if you can design it with 30 thou tracks. Only use 15 thou if you must, and 10 thou to join to processor pins.
Make the tracks exit the IC pads at right angles. Just make it look tidy, and generally the clearances will look after themselves.
Your pcb package probably has "align" and "distribute" functions - use them! C8,R11, R12 could benefit from a "align to horizontal access" and a "distribute horizontally" would space them out evenly. Why does the blue track under "MOTOR2PINHEADER" cling to the outline of the pads when there is all the space to the edge of the board to go at? You could easily damage that track when soldering in the pin header.
 

ronsimpson

Joined Oct 7, 2019
4,690
Good job for you first board.
I do not like the sharp are where the arrow points to. Right side low.
I like to center the traces in the open are. Move the trace up a little.
1750181537601.png
Pad 17 is how heat gets out of the IC. I do area fills to make the copper much larger.
1750182441104.png
 
Last edited:

Thread Starter

TimothyFelt

Joined Jun 17, 2025
4
Your object in this exercise is not to challenge to pcb company to see how fine clearances they can actually manufacture!
First, see if you can design it with 30 thou tracks. Only use 15 thou if you must, and 10 thou to join to processor pins.
Make the tracks exit the IC pads at right angles. Just make it look tidy, and generally the clearances will look after themselves.
Your pcb package probably has "align" and "distribute" functions - use them! C8,R11, R12 could benefit from a "align to horizontal access" and a "distribute horizontally" would space them out evenly. Why does the blue track under "MOTOR2PINHEADER" cling to the outline of the pads when there is all the space to the edge of the board to go at? You could easily damage that track when soldering in the pin header.
Good job for you first board.
I do not like the sharp are where the arrow points to. Right side low.
I like to center the traces in the open are. Move the trace up a little.
View attachment 351233
Pad 17 is how heat gets out of the IC. I do area fills to make the copper much larger.
View attachment 351236

Im using a ground plane to take care of that.
 

Thread Starter

TimothyFelt

Joined Jun 17, 2025
4
Your object in this exercise is not to challenge to pcb company to see how fine clearances they can actually manufacture!
First, see if you can design it with 30 thou tracks. Only use 15 thou if you must, and 10 thou to join to processor pins.
Make the tracks exit the IC pads at right angles. Just make it look tidy, and generally the clearances will look after themselves.
Your pcb package probably has "align" and "distribute" functions - use them! C8,R11, R12 could benefit from a "align to horizontal access" and a "distribute horizontally" would space them out evenly. Why does the blue track under "MOTOR2PINHEADER" cling to the outline of the pads when there is all the space to the edge of the board to go at? You could easily damage that track when soldering in the pin header.

So should I just trash this board? I did send it for manufacturing already. Do you think it will work?
 

Ian0

Joined Aug 7, 2020
13,131
So should I just trash this board? I did send it for manufacturing already. Do you think it will work?
No. It will work. PCB manufacturers are a lot better than they used to be! Just be careful when soldering that you don't take any solder resist off either by scraping it or getting it too hot.
 

panic mode

Joined Oct 10, 2011
4,975
maybe it will work...

track size is not too bad, no PCB house should have an issue with 8 or 10mil (thou) and will not charge you more.
much bigger issue are the very tiny CLEARANCES that are just BEGGING for a short circuit. they seem to be at just 1-2mil (thou) which is INSANE. i do not think any of the PCB shops that i have used so far would even accept such design because it does not meet any standard. according to IPC, for circuits up to 15V, minimum clearance of 2mil is required - for inner PCB layers. clearances between outer layers must be at least 4mil. and for practical reasons you would also want the clearances set to at least 10-20mil, even when working with low voltage. btw. if you did not ask for flying probe test i strongly suggest to probe the board yourself to ensure there are no shorts between adjacent tracks - before soldering anything.
 
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