Electrical Engineering Stack Exchange
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Questions tagged [tqfp]

For questions about the TQFP (thin quad flat pack) integrated circuit package. Consider using in conjunction with the "integrated-circuit" tag.

For questions about the TQFP (thin quad flat pack) integrated circuit package. Consider using in conjunction with .

See Wikipedia's article on the QFP package and its variants for more information.

29 questions
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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 program the bootloader on. Has anyone else tried this…
jeremy
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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?
Thomas O
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1 answer

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 them
K S K Chaitanya
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10
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3 answers

Pads in IC's corners

One can sometimes observe rectangle pads in the corners of some IC's footprints: What are they for?
Łukasz Przeniosło
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10
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3 answers

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 white dot diagonally. The upper left side of the name…
user17152
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9
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4 answers

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 package is of course smaller, but I have enough space…
Niels Heidenreich
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5
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2 answers

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 horizontally varies a good deal. The following…
Kevin Vermeer
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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 solder paste on the pad, then place the FPGA and…
Josh Vo
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4
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2 answers

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 package. I don't think its mislabeled because I have…
Newbie Noob
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4
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1 answer

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 package?
pdel
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2 answers

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 square, or is it ok to place mentioned caps closer…
Tim
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4 answers

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 QFP chips with hot air - I can't seem to prevent…
Emil Eriksson
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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 in the past: I have had two of them. And I felt…
Roman Matveev
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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 flux), I have a few questions. The guy in the video…
Marko Scekic
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Pickit 3 and PIC18F46J53

I have connected Pickit3 and the above TQFP PIC microcontroller on a PCB and connected the respective pins to it. I have checked for short circuits between pins and found none. What could be the reason the PIC is not detected by the programmer?
Rookie91
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