Arduino Forum

Using Arduino => General Electronics => Topic started by: teckk9 on Mar 14, 2019, 04:51 pm

Title: ATtiny 45 flat chip
Post by: teckk9 on Mar 14, 2019, 04:51 pm
Hello everyone I'm looking to purchase ATTiny 45 flat chip for my project. Anyone know or could direct me of a good PCU board that's cheap and I could solder this chip onto while using the PINs? I'm new to this and looking for a direction on the best and cheapest way regarding this chip for Arduino and using the boot loader to load everything that I need. Anyone have any experience? Thank you
Title: Re: ATtiny 45 flat chip
Post by: vinceherman on Mar 14, 2019, 05:37 pm
OP's image
(http://forum.arduino.cc/index.php?action=dlattach;topic=603605.0;attach=299318)

Hand solder?
I am not sure I could solder that form.  I have a microscope that I use to solder the small stuff.  SMD is doable with exposed pins.  Like this:
(https://media.digikey.com/Renders/Atmel%20Renders/8-SOIC.jpg)
Title: Re: ATtiny 45 flat chip
Post by: DrAzzy on Mar 14, 2019, 08:22 pm
You *can* use a generic QFN breakout board, with drag soldering, assuming it has a hole in the back so you can melt the solder for the exposed pad. It would be hard, though. Not for the feint of heart, shaky of hands, or poorly equipped.

I happen to sell some breakout boards that would be suitable for that... https://www.tindie.com/products/DrAzzy/breakout-boards-for-qfnvqfnmlf-smd-parts/ (https://www.tindie.com/products/DrAzzy/breakout-boards-for-qfnvqfnmlf-smd-parts/)

Do not forget the 0.1uF decoupling cap between Vcc and Gnd, which needs to be as close to the chip as possible.


That said, do you really need to use the tiny no-lead version of the chip? It's not *that* much smaller than the SOIC-8 package, which is so much easier to solder. (as it happens, I make cute prototyping boards for working with ATtiny x5 in SOIC-8 as well - https://www.tindie.com/products/DrAzzy/attiny85-project-board/ (https://www.tindie.com/products/DrAzzy/attiny85-project-board/)
Title: Re: ATtiny 45 flat chip
Post by: wvmarle on Mar 15, 2019, 08:16 am
For prototyping: use the DIP8 package. Or SOIC8 on DIP8 breakout board.

Then when you're ready to go for custom PCB you can design your PCB for the QFN package, and solder that on (quite straightforward when doing reflow, which is what they're designed for).