Questions tagged [manufacturing]

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2answers
47 views

Is infrared photoemission from silicon used in IC manufacturing diagnostics?

In the video Why all solar panels are secretly LEDs (and all LEDs are secretly solar panels) a silicon photovoltaic cell from a calculator is purposefully damaged and then a 36 V bias is applied. When ...
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1answer
44 views

How do you make custom THT (through-hole) connectors?

I have a project that requires a connector that is no longer manufactured which would interface with an old device. For prototyping, I have been salvaging this connector from old peripherals that used ...
12
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4answers
3k views

What is the minimum die area of a chip?

Silicon chips are made by slicing up wafers; in general, the fewer transistors a design needs, the smaller the area it needs, so the more chips you get out of a wafer, and the lower the cost per chip. ...
10
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1answer
1k views

Which is better - components on both sides or components on one side of the PCB?

I am working on a PCB design. 50k PCBs will be produced. SMD components: 100 Through-hole components: 25 I need to minimize PCB size. There are no high-speed signals or sensitive signals in the ...
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0answers
40 views

Creating random PCB ID via manufacturing process

I often purchase prototype PCBAs on the order of five to twenty pieces and need to uniquely identify them sans software. I usually just whip out a permanent marker and label ...
1
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1answer
46 views

Hi Pot / Dielectric Pass/Fail Recording

I just graduated last year with an Electrical Engineering degree. Currently pursuing a Masters's Degree, so I am fairly new to design. We have several HiPot Testers we use on the manufacturing line. ...
2
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1answer
84 views

Providing Schematics to a Contract Manufacturer?

A contract manufacturer mentioned the types of the files that they need in order to build and assemble boards. He indicated that they need the schematics along with gerbers, drill files, bom etc.. Is ...
6
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2answers
508 views

Specifying BOM substitutions / alternatives with Contract Manufacturer (CM)

I fear this question may be opinion based but I think it has some value to the general community - because this falls into the end of the design phase. When working with a CM, they may have better ...
2
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1answer
69 views

Is it possible to manufactrure a stencil for this paste-mask using the usual stencil making methods?

I have this footprint from the KI-CAD footprint library (LFCSP-32-1EP_5x5mm_P0.5mm_EP3.1x3.1mm_ThermalVias). The paste-mask shows several circular paste areas under the thermal pad. The separation ...
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1answer
37 views

LoRa and Manufacturing Technology

Which manufacturing technology do the LoRa (Semtech SX1276) belong to? Is it a CMOS based chip?
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1answer
62 views

Decreasing manufacturing variance in analogue designs

I'm designing some modular sensors for my company's internal testing. Most are analogue, with a sensor (PT100, current shunt, pressure transducer etc), some interfacing (REF200 based PT100 circuit for ...
2
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1answer
60 views

PCB Thickness Variability

How much variability is there in the thickness of a standard PCB? Let's say I order a 1.6mm FR-4 board. Will the actual thickness range 1.5mm-1.7mm? 1.4mm-1.8mm? 1.59mm-1.61mm? What is the (...
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1answer
57 views

Manufacturable technology for force-sensitive button

I'm hoping to hear your perspectives on which force-sensing technologies would be most reliably and inexpensively manufactured at volume. The application is a pressure-sensitive button, as are found ...
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7answers
2k views

Do manufacturers try make their components as close to ideal ones as possible?

I was wondering what developments are done on electrical components today. Do manufacturers try to make the electrical components they sell as close to the ideal model as possible? So for example, is ...
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0answers
63 views

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 ...
3
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1answer
46 views

SMD Stencil Material Choice

We are planning to purchase a stencil for our LED boards. This will be my first stencil purchase so I don't have much idea about a good or bad one. The inquiries I received typically suggest two ...
1
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4answers
533 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 ...
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0answers
68 views

Why wierd capacitance values [duplicate]

Why are capacitors available with values like 378 µfarad and 0.22 farad which have prime numbers like 11 and 7 in factorization instead of values like 375 µfarad and 0.2 and 0.25 farad ...
2
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1answer
75 views

Problems with doping semiconductor materials in 7nm technology

As you know, semiconductor technology is going to reach 7nm lithographic precision soon. Which means that the smallest segment length on a semiconductor die can be as short as 7nm. After making some ...
22
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6answers
4k views

Writable area on a PCB

I would like to create an area on my PCB where you can write on with a pen. Is this possible, and if so how should I do it?
10
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1answer
994 views

'Pick and place' feature in connectors

I am looking to source a four-pin, 1.0 mm pitch, vertical JST connector -- either BM04B-SRSS-TB(LF)(SN) or BM04B-SRSS-TBT(LF)(SN). The latter has an extra 'Pick and Place' feature in Digikey. I can'...
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2answers
146 views

Reed Switch Failure Modes

I've been playing with these through hole reed switches: MDSR-4-12-23. It has been my experience so far that you have to be very careful in handling them, including when bending the leads to 90 degree ...
4
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1answer
167 views

Designing for Low Cost China Manufacturing [closed]

I have designed a few boards on a consulting basis. Some of them have been manufactured in China in +10k unit volumes. One of the complains I have gotten from my clients is my boards can be a bit ...
7
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3answers
3k views

What is this small unconnected solder blob on this PCB?

There's a small solder blob in the middle of this one-sided PCB (a switch-mode power supply), surrounded by unmasked board. The blob is 1.5mm in diameter, and the non-masked area is 4mm in diameter. ...
3
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2answers
413 views

Usefull 0402 and 0603 solderbridge footprints compatible with machine manufacturing?

I am currently in process of my eagle library cleanup, and came up with the idea to create a footprint similar to the one from nucleo boards. Those pads are meant to be easily bridged by just solder ...
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2answers
250 views

Do any commercial products use dead bug construction? [closed]

I'm talking about connecting electronic components without using a PCB. Soldering such an assembly is pretty fast if you have a jig holding the components in place. (The examples below are laid out ...
0
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3answers
129 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....
8
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1answer
162 views

Do Soft Termination Caps Really Increase Reliability?

I'm managing several designs. At one point I identified a few failures that were caused by 0603 caps failing short. After that I switched to all soft-term caps to hopefully eliminate the problem. ...
5
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2answers
134 views

How to deal with unused components in pick-and-place file?

I intend to send a board to a PCB manufacturer and I am wondering how to mark unused components in the pick and place file. I'm using EAGLE and I saw that it includes all components in the file, but I ...
-2
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1answer
319 views

In Altium Why My Square slot is shown round in Gerber?

In Altium I have created a square slot in PCB then I create the gerber files. In CAM, file's square slot is shown as round shape. Can anyone explain why? Also I have enabled the G85 command.
3
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1answer
184 views

Manufacturing of Translucent LED Indicating Symbols (e.g. router indicator lights) [closed]

I've been researching how manufacturers create custom LED-illuminated symbols such as those seen on the router in the image below: I haven't been able to find any information online from custom ...
14
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3answers
352 views

LEDs no longer bang - or whimper!

I volunteer at a club to teach Arduino programming to teens. As part of that, of course, I talk about voltage, current and what not to do. My prime example is taking an LED, putting it directly across ...
3
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1answer
423 views

logic level conversions for opto-isolators in digital input acquisition

This isn't my usual job, I'm not an EE, but I want to give it shot... This question concerns developing an interface board to connect a device (DUT) to a test system in a manufacturing scenario. ...
0
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0answers
294 views

Fast but affordable way to crimp dupont connectors

I'm currently doing a small production run of a board I designed. It features a few pin header type dupont connectors which are used to attach cables to the board. Now, I can surely crimp this using ...
2
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1answer
386 views

How are glass diodes produced?

What I am trying to understand is how the diode is placed inside of the encapsulating glass container such as that pictured in the following: I've tried to read some patents, where I more or less ...
-2
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1answer
112 views

Still 1000 hours of lifetime [closed]

I am familiar with the famous Phoebus cartel of the companies Osram, Philips and GE, but this cartel began its operation in 1924 and lasted at most to the World War II. In the second half of the 20th ...
1
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1answer
148 views

Does Apple or Qualcomm do product binning for their SoCs?

It's well known that Intel does product binning with their CPUs — essentially selling the same chip as multiple different chips with different specs and prices based on the tested properties of the ...
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4answers
2k views

Why are accelerometers (and other MEMS devices) so rarely integrated into components?

With the way things are headed, more and more functionality moves into a single chip each year. However, one thing that seems to remain completely untouched by this is MEMS devices like accelerometers ...
0
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1answer
59 views

Any script for detecting PCB size or the trace width/spacing

everytime I place an order on PCB manufacturers (such as PCBWay), I need to fill out the related parameters of my boards - the width, the length, the trace , holes and etc. Has anyone tried to work ...
1
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1answer
6k views

JL (or maybe something else) misterious branded IC's [closed]

Edit 12/31/2019: Thanks to Mariano Dupont: Found it: Zhuhai Jieli Technology zh-jieli.com Take a look at this example of an IC found on a circuit board: Brand is found on many PCB's of Chinese/...
2
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2answers
141 views

Will PCB assemblers solder wires to the board?

When preparing a medium run prototype, are there any manufacturers out there who will solder wires to you if you ask? For example, I have a device with 6 sensor pins. I'm hoping that a manufacturer, ...
0
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1answer
130 views

CE certification

One of the required CE test technical files is "Test Reports". This document has to be provided to the test agency. Does anyone know what data should be included in this document? Here are the ...
3
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1answer
235 views

How Do They Make Surface Mount Capacitors and Resistors?

With the ever decreasing size of surface mount resistors and capacitors, how do they make such small components?
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4answers
584 views

Creating an Assembly Drawing for Fabrication Houses

I have a design for a PCB that I have been thinking about producing. One thing that I have found is that I need is something called an assembly drawing. So far, all I have been able to come up with is ...
4
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1answer
1k views

How much does it cost to prototype an analog IC?

There are many paper I see on IEEE website that claims they build their custom designed circuit on a CMOS process. Examples are 5.9GHz ring oscillator and 32-Gb/s serial link equalizer. I know that ...
0
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1answer
179 views

STM32F103xxxx VFQFPN 36 pin package thermal pad, isolated or tied to ground?

Currently designing a PCB based on the STM32F103. The package is a VFQFPN 36 pin package, which also has a large thermal pad. The datasheet for this part does not appear to indicate a pin number or ...
12
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2answers
3k views

Mounting components on both sides of a PCB

I'm designing a PCB with a microcontroller ,CAN transceiver, sensor (I2C) and linear regulator. I want to make the PCB as small as possible, so my thoughts were to use both sides of a two layer stack ...
0
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1answer
150 views

Mass producing my electronics/raspberry-pi idea - What are the steps? [closed]

Could somebody tell me what the rough steps would look like? I think I have a good idea. I have put things into practice, and it's working and so on, but it's very ugly. I guess, first I would have ...
0
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2answers
134 views

Newbie on SMD. From THM to SMD PCB design and manufacturing [closed]

I have made a prototype of a device using THM technology. Now one of my successful friends has suggested me to move the design to SMD technology to reduce component and PCB manufacturing costs. I have ...
5
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1answer
531 views

12-bit vs 16-bit DAC

When a vendor like Analog Devices offers a DAC family with nearly identical parts like the AD5671/AD5721 are both devices the same die but rated into different accuracy classes like CPUs? Is the 12-...