Go Down

Topic: SELECTING THE APT PCB TG VALUE (Read 476 times) previous topic - next topic

CrossRoads

I've had a lot of PCBs made, and reflow with SMD parts in a toaster over with high temp not exceeding 205C for 30-60 seconds.
I don't see anything here about Tg
http://support.iteadstudio.com/support/solutions/articles/1000156313-normal-condition-of-pcb-capabilities
nor do I recall seeing that at other manufacturer websites.

Once assembled, boards are operated under 85C as that is max the Atmega328P is rated for, unless more expensive Automotive grade parts are used with 125C as the top end. I have used these parts for cards designed to run in vehicles in Africa (along with appropriately rated crystals and other parts).
http://www.digikey.com/product-search/en/integrated-circuits-ics/embedded-microcontrollers/2556109?k=atmega328p&k=&pkeyword=atmega328p&FV=fff40027%2Cfff800cd%2C3f002df&mnonly=0&newproducts=0&ColumnSort=0&page=1&stock=1&quantity=0&ptm=0&fid=0&pageSize=25
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.

Qdeathstar

#16
May 26, 2016, 11:36 pm Last Edit: May 26, 2016, 11:37 pm by Qdeathstar

I'm surprised you haven't gotten a PCB made up, Raschemmel. For what they cost from OSH park even if you make a goof its worth it. It makes everything look purdy. (even if it don't work).


here is one I did...complete with amature soldering. the boards were $25 for three...

top
bottom
A creaking creeping shadow
stiff against the freezing fog
glares at a tickless watch.

Time has failed him -- all things shall pass.

raschemmel

#17
May 26, 2016, 11:51 pm Last Edit: May 26, 2016, 11:52 pm by raschemmel
*7*-Did you do the layout ?.
Arduino UNOs, Pro-Minis, ATMega328, ATtiny85, LCDs, MCP4162, keypads,<br />DS18B20s,74c922,nRF24L01, RS232, SD card, RC fixed wing, quadcopter

Qdeathstar

#18
May 26, 2016, 11:55 pm Last Edit: May 26, 2016, 11:57 pm by Qdeathstar
yes. eagle cad, hobbiest version. The green wire and pull down resistors on the bottom are where i made a oops with the layout.
A creaking creeping shadow
stiff against the freezing fog
glares at a tickless watch.

Time has failed him -- all things shall pass.

Go Up