Questions tagged [manufacturing-process]
The manufacturing-process tag has no usage guidance.
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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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How to bond PCB and metal for high power RF boards
I want to bond a PCB (2 layer & 0.6mm thickness) to a metal (copper & 4mm thickness.) Could anyone help me with the process of bonding it? There is a power amplifier that has to be soldered ...
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What exactly makes small quantity PCB production costly compared to large quantity PCB production?
The per-PCB cost of manufacturing a small number of PCB is 10 times or more compared to the per-PCB cost of manufacturing a large number of PCBs.
So what is it exactly that adds to the cost?
People ...
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How to Design method to Program & Calibrate a Panel of PCBs
I'm designing a sensor-package PCB which needs to be programmed and calibrated while still in a panel of 10.
I'd like to avoid a large bed-of-nails type setup for this step so that the panel can ...
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starting material for silicon production
Where does silicon semiconductor manufacturing start from? I mean, what are the principal ores that may be used to start the technological process and what extraction process is used? (And what are ...
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What mechanism is responsible for the β/hFE variations in manufactured bipolar transistors?
It's common sense that the current gain β (hFE) in a bipolar junction transistor is somewhat unpredictable, and one must design a discrete transistor circuit to be insensitive to the variation of β.
...
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Solution to detect bad vias in production process
I face the problem of damaged (cracked) vias in a rigid/flex assembly.
It is very difficult to detect those defects before mounting the assembly. Products with cracked vias may fail during lifetime ...
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How to prevent solder getting into through hole during HASL process?
I think this is an easy enough question - I just don't know how to effectively search for the answer.
I have a PCB that came back and the programming header is plugged with solder. This most likely ...
- 12k
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Circuits that take advantage of tolerances in components
Bit of a wordy question title...
I was trying to simulate an astable multivibrator the other night and the simulation refused to run. I eventually realised that because the simulation assumes perfect ...
user103993
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1
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Failure Rate calculation based on manufacturing defects (capacitor)
Electronics failure rates typically follow the exponential distribution and models like Prism, Mil-Hdbk-217 or 217Plus (newer) are used to predict failure rates.
We are currently in the production ...
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Design for manufacturability [closed]
I am a current EEE student and was wondering how the process of design for manufacturability works?
What are the technical and safety issues that a manufacturer focuses on when designing a product to ...
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Can the TFT in LCD displays be made in the nanometer range?
Can the TFT elements and hence the pixels in an LCD display be made in the nanometer range? Say 10nm x 10nm?
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What material(s) are used in IC's as insulating layers between metal layers?
This question and the answers hits close to the topic. One picture shows it as SOD. Silicon-oxide dielectric?
I'm aware that around/within the transistor, silicon oxide is grown for insulation where ...
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How long can the leads protrude for a typical selective solder machine?
I have an LCD who's leads extend about 10mm past the board surface.
Can a typical selective solder machine fountain reach this high?
If not, any suggestions on the best way to handle long ...
- 10.2k
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PCB design rules
To design my board, how may I ask a PCB manufacturer for the constants rules or clearance rules? What is the particular terminology that I would use at the time of asking about the design standards ...
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Why can my bare PCB be magnetized?
I am working on a magnetic sensors design and noticed that my measured magnetic field bias shifts over time. I have studied the bare PCB and measured that it can be magnetized with a strong magnet.
...
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What components have a MSL of 5 and 6?
Moisture Sensitivity Level (MSL) relates to the packaging and handling precautions for some semiconductors.
Components with an MSL of 1 have an unlimited floor life, whereas components with an MSL of ...
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Why are resistors tolerances relative instead of absolute?
Every resistor has a tolerance, this provides the user with an idea of the accuracy of the product. This tolerance is represented by a percentage. This means: a big value resistor will be less ...
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Process technology: LP and LPH
My question is related to the following news regarding IC process technology:
Samsung has introduced 28-nm LP HKMG and a new variant, 28-nm LPH HKMG process technology.
Following abbreviations are ...
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Component manufacturing and placement accuracy/precision
I am involved in a community project where I need to employ computer vision on common smartphone models (Samsung Galaxy S 5/6/7, iPhones etc.). Doing that involves calibrating the phone's camera for ...
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Will a 0.400mm thick PCB be too flexible?
My PCB will roughly have the following stackup:
35um copper foil (tracks)
100um FR4 prepreg
200um FR4 core
100um FR4 prepreg
35um copper foil (tracks)
This gives a total board thickness of around ....
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How much silicon is required for the most common ICs?
Where can I find information about the die surface for various ICs? I'm thinking about opamps in the first place.
The surface area is of course dependent on the features of the ICs (for opamps rail ...
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Anyone know the premise of this PCB assembly note?
The assembly note states:
Bake bare PCBs in a clean and well ventilated oven prior to assembly at 125*C for 24 hours.
Why is this necessary?
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Why solvent cleaning of clean wafers includes de-ionized (DI) water?
Solvent (or solution) cleaning of clean wafers includes acetone wash, isopropyl alcohol (IPA) wash and de-ionized (DI) water wash, followed by drying in nitrogen.
What's the purpose of using DI water?...
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What are the manufacturing difficulties for a large Li-Ion battery pack?
How is a large Li-Ion battery pack, such as in a car, manufactured? What makes it difficult to produce, if anything?
This question is born from the high cost of Tesla Model S, which is around $70k. ...
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How are few-nanometer multigate MOSFETs fabricated?
Intel and IMEC came up with multigate MOSFET designs with channels as narrow as new nanometers. Which methods/techniques/machines are used to pattern/fabricate such small features?
(source)
(source)
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How do custom security certificates find their way onto mass manufactured products?
Amazon and Microsoft both have IoT services that manage message and state brokering. These sort of services generally require machines to have unique security certificates embedded into the firmware ...
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Custom fiber optic cable simulation
I am looking to create a custom & precise static optical distribution along the length of a fiber optic cable. The idea involves manipulating an optical fiber during manufacturing to produce the ...
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Optimizing product tests?
I'm currently working for a company where I design and implement an automated test program to test our products. Currently our tests take quite a bit of time (several minutes per unit) and need to ...
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Why do some diodes have a glass package?
Put simply, why do some diodes such as most Zeners and Schottky diodes have a glass package as opposed to the more traditional plastic package?
Is it ease of manufacturing, thermal properties, or ...
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