Questions tagged [tqfp]
For questions about the TQFP (thin quad flat pack) integrated circuit package. Consider using in conjunction with the "integrated-circuit" tag.
31
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8
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Pre-programming surface mount ICs
I'm trying to set up a PCB with an atmega168 and no programming header. I intend to use a serial bootloader (there is a ft232 on the board) to reprogram but I am wondering about the best way to ...
- 5,115
19
votes
1
answer
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LQFP package vs. TQFP package?
In my PCB editor, both LQFP and TQFP have the same footprints, except the TQFP has shorter leads than the LQFP. Is that the only difference?
- 31.9k
15
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1
answer
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What is the difference between VQFP, HVQFP, TQFP & PQFP?
VSC7145XRU-31/C - this IC uses PQFP package
the replacement component for that TLK2201 uses HVQFP package
also TLK2541 uses TQFP
that's why i wanted to know whats the clear difference between ...
- 151
10
votes
3
answers
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Pads in IC's corners
One can sometimes observe rectangle pads in the corners of some IC's footprints:
What are they for?
- 1,679
10
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4
answers
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In production, is there a significant difference between QFN or TQFP components other than space?
When producing a run of PCBs, does it matter if I choose QFN or TQFP components? Say, I want to have 1000 boards manufactured with an Atmel AVR that is available in QFN or TQFP packages. The QFN ...
10
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3
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Find first pin of a LQFP chip
I have bought some ATSAM4E8C chips in LQFP 100 package. The datasheet shows that the IC should have a dot indicating the first pin, but mine have two dots. One larger in the corner, and a smaller ...
- 337
7
votes
4
answers
645
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STM32F4 TQFP100 part orientation
I have mounted a STM32F446VETx on my PCB as shown on a picture of my PCB:
For me the pin 1 marker in the big mark at the top right of the picture, near C67.
But, after a lot of trial, I can't connect ...
- 6,481
5
votes
4
answers
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how to manually solder exposed-pad QFP package (Altera 144 pins)
I need to manually solder an exposed-pad QFP Altera FPGA. This is crucial, since the pad is used for electrical purpose (not for thermal purpose)
I have tried the following but failed. I just put ...
- 285
5
votes
2
answers
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Pad dimensions and land patterns for QFPs
I'm putting together a footprint for a 100-pin, 14x14mm TQFP, and I'm finding conflicting designs. The pitch and width of the pads are all basically the same, but the length and centering of the pads ...
- 20.1k
4
votes
1
answer
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Solder mask for 0.5mm pitch TQFP
I'm using Atmel SAM chips and the data sheets don't have any mention of solder mask clearance for their TQFP packages. What would be a nominal pad/solder mask opening/cream size for a 0.5mm pitch ...
- 285
4
votes
2
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Is this a fake STM32F105? There is no parts listed with that many pins
I am working with a device that has a 100 pin qfp it is labeled:
ARM Z
STM32F105R8T6
But this part only seems to be available in a 64 pin package.
The R in the number dictates that it is a 64 pin ...
- 896
3
votes
2
answers
416
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Minimum distance from TQFP to chip cap on PCB assembly?
I want to put decoupling caps (0603) as close as possible to TQFP-48-7x7. So PCB/assembly wise how close I can put them (pad to pad, component to component)?
Does the 'court yard' need to be exactly ...
- 361
3
votes
4
answers
2k
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Solder bridging when reflowing QFP
Today I attempted to reflow solder a board using a solder paste mask and a hot air station but for a QFP chip, I got a of solder bridging. This has generally been my experience with trying to solder ...
- 459
2
votes
1
answer
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Hand soldering QFP component
I recently came across this video on YouTube, in which the guy is soldering a .5 mm QFP component.
Hand soldering a .5 mm QFP Chip
As I haven't done a lot of soldering in my life (and never used ...
- 79
2
votes
1
answer
261
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How to programm AVR ATmega48 in TQFP32 soldered onboard?
I have a board (actually - many of them) with ATmega48PA (TQFP32) soldered in and no ISP connector. Some of the ISP lines are even not routed.
I used Hobbyking programmer to connect to the processor ...
- 3,012