Questions tagged [qfn]
For questions related to the QFN (quad-flat no-leads) component package.
48
questions
10
votes
1
answer
553
views
Help is needed with IC identification
I have a gateway laptop model P5SW0 which I got in none working condition. Taking measurement, some capacitor was identified to be shorted. Upon removal of the capacitor the short disappear, and ...
- 323
0
votes
1
answer
49
views
Footprint pads for an RF chip in QFN package
We are working on a design that uses the Analog Devices HMC321A. The datasheet does not specify a recommended footprint; they do specify the IC dimensions. The pins/pads on the chip have a nominal 0....
- 2,153
0
votes
1
answer
129
views
Need help identifying this chip / package
I got this faulty chip out of a Corsair AIO water cooling unit.
I can't identify this chip or its package. Pictures of the chip are below.
The size is rather small, 1mm x 1.2mm. The markings on top ...
- 9
0
votes
1
answer
92
views
Unusual IC package in Li-po charging circuit
I came across this IC package on a Chinese Li-po battery charging circuit PCB. It appears to be a type of boost converter/charge controller. It looks like a 3-sided QFN 3x3 with 16 pins. No logo or ...
- 1
2
votes
2
answers
341
views
What are best practices for QFN footprint design for manufacturability?
I've never previously designed a board for mass production (as opposed to boards I hand-solder myself with a soldering iron and rare application of a hot-air station), but it's looking like I'm going ...
- 35.2k
0
votes
0
answers
77
views
QFN-28 REVERSE Breakout Board
I am trying to build a PCB board that I found on GitHub. In a rash we ordered few sets of the PCBs without inquiring about the parts availability. Turns out one of the parts is not available in all ...
- 109
0
votes
0
answers
159
views
Can I make GND vias like this under my QFN package?
Can I make GND vias like this under my QFN package?
- 176
4
votes
1
answer
395
views
What's going wrong with my solder paste / mask?
A short question this - I've got a board with a QFN-32 0.4mm pitch footprint, I ordered this stencil, and a tube of this solder paste, and the result is in the picture below.
Now, I'm new to this, but ...
- 7,159
1
vote
1
answer
1k
views
Thermal pad with a via: how to deal with solder paste?
I have a TLC59283RGET part which comes in a VQFN24 housing.
It has a thermal pad on the bottom.
In my schematic, I have placed a via on that thermal pad, so I can route it as GND to other places.
I am ...
- 253
0
votes
1
answer
111
views
QFN Programming / Tester / Adapter
I need to be able to test a batch of components ordered abroad. Soldering and removing them one by one would take a long time.
I need to be able to read this 6 by 4 component. But can't find anything ...
- 11
6
votes
1
answer
470
views
Why do I have shorts/bridges on QFN packages on PCBA during assembly? Stencil Printing problem
I am trying to do a home assembly of PCB but I have issues after reflow soldering. Especially I have bridges/shorts on the pins of QFN packages. I have assembled multiple boards other joins are okay ...
- 453
0
votes
1
answer
459
views
How do I calculate the x & y dimensions of pin 1 for a QFN package?
I'm trying to make changes in pad location. How do I calculate the x & y location of pin 1? Is there any mathematical calculation, how do I do those calculations?
I'm sharing an image of a QFN ...
- 3
0
votes
3
answers
79
views
Question about traces on a QFN24
On my board I have an LAN8720AI QFN24 package. When I route it via FreeRouting I get this:
As you can see most pins are routed fine but some like pin 18 (RMII_TXD1) just goes straight up instead of ...
- 311
0
votes
2
answers
589
views
SMT soldering for QFN package without legs
I have soldered through-hole and SMT before but this is the first time I have to do SMT (QFN) package which has no legs. I tried the traditional approach, Flux, solder, then heating the component. But ...
- 165
2
votes
1
answer
1k
views
When should bare die be used instead of QFN/BGA packages?
I have no experience with bare die as a package, and I have been recently tasked with deciding between bare die, BGA, or QFN package for a SoC.
Searching the internet, I have not really found much ...
