Questions tagged [manufacturing]
The manufacturing tag has no usage guidance.
230
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Attempting to patch the "G75 Bug" on a Gerber Level
Context
I am currently looking for alternative PCB manufacturers for my company and have sent Gerber files to some (Chinese) companies.
These Gerber files have already been used in the past by various ...
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PCB design for Renesas' DA7212 audio codec
I'm designing my very first PCB. I managed to route all my components and I'm stuck at the last footprint - DA7212 from Renesas:
Those balls are both incredibly tiny and packed dense. I'd need a ...
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4
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1
answer
100
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Deliver high current through vias
There is a demand for a delivery of 3 A through several layers using vias.
Presented below in the picture is my PCB manufacturer's abilities regarding vias.
A single via can withstand 1.4 A. Are there ...
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1
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1
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98
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Tight GND plane Pros and Cons
Imagine a typical 2Oz/1Oz, 4 layer PCB with a stack-up, Sig/Pwr, GND, GND, Sig/Pwr. Your typical trace width/space would be 0.2mm/0.2mm, and a prepreg Dk of ~4, ignore the Core. Fastest signal on the ...
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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
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2
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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 ...
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1
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Electronics Manufacturing Engineers: What needs to meet IPC-6012 the finished copper or the starting copper foil?
I have a PCB that has a finished copper thickness of 1 oz on all layers and must meet IPC-6012 requirements for Class 2.
Does this mean that the manufacturer can start with 0.5 oz copper foil then ...
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60
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Long term availability of WS2812B or any Neo-pixel
I am considering the use of Neo-pixel or WS2812B components in a project that we are planning to run for the next ten years with mass-scale production. I am curious about the feasibility of sourcing ...
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0
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Generating cold plasma using a Piezo Transformer
I am trying to generate cold plasma using a multi layer piezo transformer.
My understanding was that it was as simple as applying a 15 Vpp to the transformer, but it did not work.
I was trying to ...
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1
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What kind of displays and processors are used in consumer electronic products (like a coffee machine)? [closed]
I am presently working on the development of a smart kitchen appliance, which will eventually be sold in the market. As part of this project, I need to incorporate a touch display for the operation of ...
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2
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130
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What are the primary industrial uses of gallium and germanium in electronics?
After the "neon shortage" struck I asked What are the ways in which semiconductor-grade neon is critical for manufacturing? and the answer(s) turned out to be quite informative.
Al Jazeera's ...
- 3,419
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2
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61
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Trimmer Pot - Default Setting from Factory
I have been using a trimmer pot (Bourns 3224W-1-104 100k 3224W 4mm 11-turn SMD Trimmer Pot) in a design. The pot does not get adjusted in production and ships with the pot set as shipped from the ...
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Question on "Parts should be used within 5 days after opening." statement on component shipping package
I've been given the task of verifying a batch of ICs from a chinese broker, to see that the chips the company has bought are what the broker claims they are. The package we've received looks like this,...
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Identifying Semiconductor Fabrication Defects
During my semiconductor fabrication lab, I encountered defects in my devices. Can you help me identify the technical name for these defects?
The first defect is caused by particle contamination and ...
- 121
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1
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60
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Best LCD for mass production
I'm designing a PCB that will be manufactured in small batches (a few hundreds). It will have a segment LCD with electronic components under it. I cannot choose between two form factors - with SMD ...
- 585
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Functional discrepancy within PCBA batch
When manufacturing a small prototype batch of an embedded system at EMS I have detected different behavior between the units. All units work as expected, except that some units fail to operate same ...
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0
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What is different in the manufacturing of differently rated MOSFETs?
The IRF540N is one of the MOSFETs I'm using, and the IRF510N. Both look exactly the same from the outside because they use the same packaging, but they are rated for different power levels.
For ...
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4
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Using a Schmitt trigger IC vs making one from op-amps or transistors
In a professional setting, what is the benefit of using a Schmitt trigger IC as opposed to making one from op-amps or transistors? In a high volume application, wouldn't an op-amp implementation be ...
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48
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Reed Switch Selection - Quality Control
I have a piece of hardware which uses reed switches and neodymium magnets. When I attempt to produce this hardware in batches I find that some reed switches that I have are more sensitive than others ...
1
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1
answer
184
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How to design this kind of blade antenna? How does it even work?
I've recently stumbled upon this kind of blade antenna:
And I'm wondering how does it work? The entire thing seems to be made of CNC milled / cast metal, making the radiating element and the ground ...
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2
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107
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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, ...
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3
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388
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Altium component rotation on the PCB does not match the pick-and-place data
I am generating files for manufacturing my design in Altium 22 and ordering through Eurocircuits.
What I noticed during the ordering process is that the rotation of many components (and sometimes the ...
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What is Electromagnetic Cross Section?
What is Electromagnetic Cross Section?
(shock section)
Hello, I have a question regarding the manufacturing process of electronic components in the case of the silicon deposition and corrosion process....
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1
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How were the phosphors applied to the inside glass tube of older colour CRTs?
I've been reading into how CRTs were assembled and how they work, but I can't seem to find any concise information behind how the coloured phosphors inside the inner glass tube were applied. There is ...
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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), ...
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7
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Component Tolerance Probability
This is more of a manufacturing question than anything else.
What is the probability distribution of component tolerances?
For example, let's say I ordered a 100 ohm, 5% resistor, and I order 100 ...
- 170
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1
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671
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What are the ways in which semiconductor-grade neon is critical for manufacturing?
This is a question about material use specifically in semiconductor manufacturing.
CNN's Ukraine halts half of world's neon output for chips, clouding outlook begins:
Ukraine's two leading suppliers ...
- 3,419
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1
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233
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Soldermask bridge gap too small - PCBWAY
I've got a PCB design which contains a chip that uses the QFN (7x7) package.
Because of the package size the pins are very close together and the pads are 0.2mm apart, which is smaller than the ...
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1
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Are there any resources on Column Last Attach Process? [closed]
I am trying to find resources about this process, but the only thing I have been able to find is the full form of the acronym CLAP any help is appreciated.
This process is used vehemently in the ...
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Why is that vias are generally made of tungsten while contact is made using aluminum?
From this thread:
...
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IPC standards to ask manufacturer to assure a PCBA is correctly manufactured?
I'm preparing all the documentation to send to my PCBA manufacturing supplier and I wonder if there's a list of IPC standards to include in this documentation and verify they are compliant to them and ...
- 143
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If a PCB is inspected to an IPC-A-600 class higher than specified what are the negative impacts?
I have received several parts from a PCB manufacturer which should have been inspected to IPC-A-600 Class 2 but were instead inspected to IPC-A-600 Class 3.
I believe I have received PCBs inspected to ...
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A possible shot in the dark - Seaward HAL-104 Tester experience?
This post might be a shot in the dark, but has anyone here had any experience with the Seaward HAL-104 tester and its remote command protocol functionality? Or perhaps know someone who has? There is ...
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309
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Blade Fuse Properties?
I am sure you have seen automotive 'Blade' fuses. They are special fuses constructed to protect equipment that is DC powered. I have asked around and determined that a 125v DC rated fuse is more than ...
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What Are the Advantages and Disadvantages of "Conductive Plastic" Potentiometers
Maybe it's just the name putting me off, but I'm looking at potentiometers for a new design and I'm noticing that a lot of the cheap ones use "conductive plastic" as the resistive element. ...
- 6,603
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How were "old" chips manufactured, such as the 6502?
Recently, there have been several youtube vids (example) talking about how modern CPUs are manufactured. Basically, it's a complex nightmare of dropping molten tin and lighting it with light, which ...
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Why are most COB LEDs physically yellow?
Many "LEDs" found on devices nowadays appear to be yellow where the light comes from (when the device is off). Why yellow?
I put LEDs in quotes because COB leds can consist of many ...
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Node Technology in Modern Transistors
i was reading about the new 2nm chip IBM created and through some reading i learned that the "nm" part does not refer to the actual gate length like it did many years ago. Can anyone tell me ...
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4
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Environmentally sustainable electronics
I am part of my company's work to become more environmentally friendly and sustainable. On a high level for the company that means pursuing ISO certifications (such as ISO 14001) and working according ...
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2
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Placing through hole and SMT on the same side
I have a design with huge push buttons (with 6 TH holes.)
There's a few of them so they do take up quite a bit of space mechanically from the top.
I was thinking of placing the majority of the SMT ...
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1
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What are my options for packaging a WLCSP IC as a DIP?
Hypothetically, let's say I have a chip in a super small WLCSP or BGA package that I want to have packaged as a plastic or ceramic DIP. No extra components; just the pads brought out to pins.
Are ...
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3
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2k
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What are some reasons for hand painted dots on chips?
I've seen lots of products with hand painted dots or markings on chips, what do they often mean? Obviously I understand everybody has their own reasons but could it be an industry common practice for ...
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Electrically isolate bottom side of a PCB
I have a 4-layer board with no parts on the bottom side, the bottom-side solder mask fully covers all vias.
I want to stick the board with a double-side adhesive foil on the metal bottom side of a ...
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640
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How to read Diode Numbering System
How do I read diode numbers. I read that the numbering system for US diodes is the JEDEC system. But I don't think the JEDEC system applies to diode numbers after 1N. Everywhere I look I cant only ...
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How is the asymmetry of a Schottky diode obtained?
A Schottky diode is constructed with two metal conductors bonded to a doped semiconductor. One of the metal-semiconductor junctions is a Schottky contact, and the other metal-semiconductor junction is ...
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How would you connect a light dependent resistor / photoresistor/ CdS cell at a right angle to a surface mount board?
My project uses light dependent resistors (aka photoresistors or CdS cells). All the ones I can find for sale from the usual suppliers are through hole type. ie. they have two wire legs.
The PCB I'm ...
2
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4
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930
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Best practice for wire harnesses in a BOM
Ive started a new job at a startup and am working on a BOM for a box build with a couple of PCBs and wire harnesses inside. Im in a bit of an impasse about how best to define wire harnesses in the BOM....
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Need help understanding how motors, sensors and other components of a prototype design factor into certifications for industry sale [closed]
I have built a prototype and I now need to create a production prototype that I can use as my template for a small 10-15 product unit batch order. I am in the United States where I plan to market ...
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Do Professional Manufacturers Violate IPC Standards?
I lay out simple boards using BGA packages and often ignore my EDA tool's courtyards. I know these courtyards are set by IPC standards to allow for good design, but then I look at boards like the ...
user167743
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Accuracy of manufactured photocells (LDR) with respect to light intensity
I was looking through photocell (photoresistors) datasheets, like for instance the NORPS-12, especially the graphic on resistance value versus light intensity.
In no datasheet could I find information ...
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