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Topic: DIY solder mask (Read 1 time) previous topic - next topic

bobthebanana

Has anyone tried making their own solder mask for homemade PCB's? I'll be using some 0.5mm TQFP packages on an upcoming project and it would be nice if I could get some sort of solder mask between the pins to reduce solder bridges when drag soldering. So far my best idea is to spray the whole board with high temp spray paint and scrape away the paint on the pads with a knife. Alternatively I've seen high temp. felt tip markers which might be less messy. Does this sound feasible? Does real solder mask have some special property which makes it repel solder? And, no, I'm not interested in making a stencil and using UV curable paint.

laadams85

#1
Feb 27, 2013, 02:31 pm Last Edit: Feb 27, 2013, 03:16 pm by laadams85 Reason: 1
Over at sparkfun they have a tutorial for making a solder paste stencil.
https://www.sparkfun.com/tutorials/383

Edit: it appears I didn't entirely know what you where asking for, don't mind me, nothing to see here.

vasquo

You should check out Oshpark.com

0.5mm TQFP etched at home? Do you like pain?  :smiley-mr-green:

Grumpy_Mike

Quote
I'll be using some 0.5mm TQFP packages on an upcoming project

I have not seen professional boards that manage to put a solder mask between the pins of 0.5mm pitch. And I have been in the business many years.

CrossRoads

I have Mike - mmcp42 helped us modify the 0.5mm pitch Mega2560 pads to make them a touch narrower, and iteadstudio was able to apply soldermask in between pins.
The standard eagle footprint has pads that are a little too wide.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

mmcp42

there are only 10 types of people
them that understands binary
and them that doesn't

Grumpy_Mike


I have Mike - mmcp42 helped us modify the 0.5mm pitch Mega2560 pads to make them a touch narrower, and iteadstudio was able to apply soldermask in between pins.
The standard eagle footprint has pads that are a little too wide.

Well wow.

CrossRoads

No, was more of a trumpet fanfare kind of call to praise your past works 8)
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

mmcp42

there are only 10 types of people
them that understands binary
and them that doesn't

qwertysimo

0.5mm TQFP etched at home? Do you like pain?  :smiley-mr-green:


Why not? I etch 0.4 mm 20-pin QFN (for MPR121, capacitive touch sensor) at home without any problems...

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