All Questions
Tagged with manufacturing soldering
13
questions
3
votes
5
answers
962
views
Tolerance of board-to-board headers
I am designing two boards. The bottom one is the power board that contains power switches on IMS (metal-clad board), while the top board is the logic board (4-layer FR4). Board to board height is ...
- 489
2
votes
0
answers
101
views
How old is too old for BGA chips soldering
I need to buy a batch of UFGBA100 STM32 MCUs from a Chinese broker. I'm concerned that in the quote they specified that the chips will have a date code 19+ (4 years old). How can this affect ...
- 497
2
votes
2
answers
141
views
Lifting Pins on SMT RJ45 Connector
I'm running into an issue with a specific RJ45 SMT connector where the I'm getting at least 1 pin lifting on >50% of the boards that run through our reflow oven. The rest of the components on the ...
- 21
0
votes
2
answers
125
views
How good are current PCB debugging tools? [closed]
I'm a newbie in the field of manufacturing, and I'm hoping to get a broad understanding of the field. After you get PCBs manufactured, I understand that you need to check for mechanical damage, ...
10
votes
5
answers
2k
views
ADC stops functioning when cold
EDIT: VERY INTERESTING TEST RESULTS
I just tried inducing the thermal failure using an inverted "can of air" (likely difluoroethane). It even when its super cold, (might even be below -40C), ...
- 449
10
votes
2
answers
186
views
Why are the heatproof composites used for semiconductor packages never used for coil formers, connectors and switches?
It is very hard to destroy the material normally used for "plastic" IC and transistor packages with IR or hot air soldering tools, unless you apply a measure of heat that would reliably ...
- 3,115
2
votes
1
answer
108
views
Do I need to Reduce the Width of a Power Trace for Thermal Relief When it's Passing Through a Pin on the Chip?
I'm routing a PCB. Currently, all power traces are 20 mils. A QFP chip on the board requires multiple voltage rails to operate, I found the easiest solution is passing a power trace through a pin on ...
- 7,218
1
vote
0
answers
407
views
Thermal reliefs for via-in-pad under BGA?
I'm doing the layout of a high-speed (Multi gigabit) system based on an FPGA with more than a thousand BGA pads and 0.8mm pitch on a 10-layer board. I'm using via in pads that will be copper-filled ...
- 2,612
1
vote
4
answers
4k
views
Soldering one PCB to another with 90 degrees angle
I want two PCB's to be soldered with each other in 90-degrees style.
I think that the base PCB should have a slot with the width equals to the top board thickness. The top board should have a flange ...
- 3,012
0
votes
3
answers
142
views
Makeshift SMT Station. Any suggestions? [closed]
I am trying to do some surface mount soldering for my project and have hit a few snags.
My hot air gun works perfectly fine for most of the PCBs I am making but one type in particular is problematic....
- 152
0
votes
0
answers
265
views
Leaded wave soldering temperature on "lead free PCB"
I've a question regarding what temperature is recommended on a leaded wave soldering machine?
Background of question
The case is that I've the option to use a leaded (when customer allows) or a lead-...
- 626
1
vote
4
answers
1k
views
High precision soldering of through hole components
I have a through hole component with many leads spaced closely together, see picture:
I'm looking to unsolder it from the PCB and then solder it back again. Unfortunately, the leads are spaced so ...
- 65
3
votes
4
answers
725
views
Do any SMT components require hand soldering due to heat limitations?
It has been claimed on another board that some SMT components cannot be used in an automated production line (i.e. reflow or wave soldering) because they cannot withstand the heat/temperature. Hand ...
- 1,944