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Topic: QFN Dummy packages for practice. (Read 219 times) previous topic - next topic

srnet

I am working on a project that will use a ATmega 1284P in its 44 pin QFN package.

There are plenty of instructions\videos to be found showing how to DIY solder them to boards and I have used some smaller QFNs in the past.

The PCBs will be small and low cost, around 10p each, so I dont mind wasting a few practicing.

The 1284ps are £5 each, I would rather not waste them.

So can I get dummy packages to try my DIY SMT skills on ?
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MarkT

No, but there are much cheaper chips in QFN.

[ Having said that some counterfeit electronics are empty packages... ]
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pert

Cheapest I could find are the ATmega324P (or maybe ATmega164P). Not super cheap but it's nice that the chip is actually useful for something.

srnet

Unfortunately a 32pin QFN does not fit on the 44pin PSB pads for the 1284P.
$50SAT is now Silent (but probably still running)
http://www.50dollarsat.info/
http://www.loratracker.uk/

larryd

No technical PMs.
The last thing you did is where you should start looking.

pert

Unfortunately a 32pin QFN does not fit on the 44pin PSB pads for the 1284P.
Who said anything about a 32 pin QFN? If you're responding to my suggestion of ATmega324P, it uses the 44pin QFN 7x7 package just like the ATmega1284P. It's in the same family. Same IO, pin compatible, but with less memory. Same with the ATmega164 but those are actually a little more expensive on Digikey than the ATmega324.

srnet

If you're responding to my suggestion of ATmega324P
Apologies, I actually checked the 328P datasheet ................

Farnell have them, about £1.60.
$50SAT is now Silent (but probably still running)
http://www.50dollarsat.info/
http://www.loratracker.uk/

Paul_KD7HB

I am working on a project that will use a ATmega 1284P in its 44 pin QFN package.

There are plenty of instructions\videos to be found showing how to DIY solder them to boards and I have used some smaller QFNs in the past.

The PCBs will be small and low cost, around 10p each, so I dont mind wasting a few practicing.

The 1284ps are £5 each, I would rather not waste them.

So can I get dummy packages to try my DIY SMT skills on ?
Google has a bunch of links if you look for "dummy smd devices"

Paul

srnet

Google has a bunch of links if you look for "dummy smd devices"

Paul
Yep, and one supplier in the UK. Minimum order Q of £50.

Somewhere, no doubt in China, I bet they a landfill site full of 'rejects'
$50SAT is now Silent (but probably still running)
http://www.50dollarsat.info/
http://www.loratracker.uk/

MarkT

#9
Aug 09, 2018, 11:13 pm Last Edit: Aug 09, 2018, 11:16 pm by MarkT
Cheapest I could find are the ATmega324P (or maybe ATmega164P). Not super cheap but it's nice that the chip is actually useful for something.
No, there are many much cheaper QFN devices, smaller devices, everyone's phones are full of them.
For instance voltage regulators.
[ I will NOT respond to personal messages, I WILL delete them, use the forum please ]


srnet

No, there are many much cheaper QFN devices, smaller devices, everyone's phones are full of them.
For instance voltage regulators.
Are there ?

How many do you have to buy ?
$50SAT is now Silent (but probably still running)
http://www.50dollarsat.info/
http://www.loratracker.uk/

MarkT

Are there ?

How many do you have to buy ?
Price breaks and postage costs depend on your electronics supplier...  And there seem to be a good choice
of QFN and DFN opamps from a low price up too.
[ I will NOT respond to personal messages, I WILL delete them, use the forum please ]

pert

Not a single 44-QFN package Op Amp listed on Digikey. Please provide a part number.

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