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Questions tagged [manufacturing-process]

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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 ...
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0answers
61 views

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 ...
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1answer
35 views

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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1answer
56 views

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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2answers
194 views

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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0answers
123 views

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 ...
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1answer
256 views

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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1answer
401 views

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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1answer
343 views

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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3answers
2k views

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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1answer
97 views

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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1answer
77 views

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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1answer
277 views

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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2answers
130 views

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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3answers
1k views

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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1answer
715 views

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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4answers
226 views

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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1answer
69 views

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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1answer
147 views

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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0answers
73 views

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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1answer
153 views

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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2answers
7k views

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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2answers
2k views

Microcontrollers Manufacturing Process

I'm interested into know what semiconductor manufacturing process use the most common PIC and AVR microcontrollers, in particular 8 bit microcontrollers. Obviously they are not at the same level of ...