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Questions tagged [tqfp]

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2
votes
1answer
52 views

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 ...
1
vote
5answers
245 views

Programming a AVR in TQFP package

So I got an ATmega328P in a 32 pin TQFP package, along with the breakout board shown. I have connected the pins in accordance with the datasheet. I added the decoupling capacitors after searching ...
4
votes
2answers
366 views

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 ...
1
vote
1answer
203 views

Understanding the package drawing of a qfp

I am designing my very first PCB and there are a few things on the package drawing of my microcontroller that are unclear to me. Why are the sizes expressed in fractions? e.g.: 0,23/0,13 or 0,75/0,...
2
votes
1answer
443 views

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 ...
1
vote
1answer
642 views

Burning bootloader on atmega1284 tqfp

Is the process of burning a bootloader (JChristensen's mighty-1284 to be precise), on an Atmega1284 microcontroller same for both DIP (Atmega1284p) and tqfp (Atmega1284-au)? While searching online ...
5
votes
2answers
5k views

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 ...
1
vote
1answer
125 views

Any reason not to bend the pins on TQFP and VQFP packages

I have an FPGA with a VQFP package, and I need to bend some pins back and hand solder them to fine gauge wire. Is it likely that this will damage the device?
0
votes
1answer
302 views

Need Help… So Confused with this QFP32 SA663 Socket

I purchased an SA663 clone QFP32 Socket online, but to my extreme dismay, it doesn't work, or at least I haven't been able to get it to. Basically the original SA663 is a 1:1 pinout. But after trying ...
8
votes
3answers
1k views

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 ...
4
votes
1answer
864 views

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 ...
1
vote
1answer
6k views

TQFP vs QFP landpattern

I know these packages have different thickness, but I have a hard time to find a TQFP landpad spec. Is it using the same landpad as for QFP (reflow soldering)?
1
vote
2answers
422 views

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 ...
1
vote
2answers
721 views

Easiest way to solder connections to all the legs on a surface-mount chip?

Recently, I went through the process of soldering wires onto the legs of a TQFP chip (~0.8mm pitch) which has already been mounted on a PCB. This is a project where I am doing some modifications to ...
5
votes
4answers
2k views

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 ...
3
votes
2answers
316 views

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 ...
1
vote
3answers
891 views

QFP on stripboard, without PCB?

Are there any tricks I can use to connect a QFP (or similar) package component to a stripboard (veroboard), without the hassle of setting up a personal PCB fabrication kit to make a breakout board? I'...
14
votes
1answer
11k views

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 ...
5
votes
1answer
2k views

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 ...
17
votes
1answer
26k views

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?
22
votes
8answers
3k views

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 ...