Questions tagged [pcb-fabrication]

About the manufacturing of PCBs (Printed Circuit Boards).

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1answer
47 views

Further etching of a fully fab-housed PCB, partial etching [closed]

I might want to zap only a part of it; mouse bites or v-scoring the PCB will be considered two designs on the same PCB and charged extra, so... is this doable ?
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1answer
40 views

copper balancing poly on 4 layer PCB

i am designing the 4 layer pcb for the first time. I got typical 4 layer stackup - signal on the top, GND, PWR, signal on the bottom Most of the signals are routed on top, few are on bottom, and ...
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1answer
57 views

Equivalent Mosfet Recommendation [closed]

We need to use a mosfet(AP9963GP), but cant supply it. So can we use this mosfet (IXF220N06T3) instead or anything else that you recommend?
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1answer
40 views

Tie via stitching and fencing to GND

I know that via stitching requires me to assign my vias to a signal (like GND pours on top and bottom layers). Do I need to assign signals to the vias in order to "fence" routed nets, for ...
4
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1answer
51 views

Is combined footprint for LQFP and UFQFPN packages a good idea?

We are struggling to source STM32L4Q5CG chips due to global semiconductor shortage. Normally I am using LQFP48 package which allows me to easily rework PCB if necessary. But sometimes UFQFPN chips ...
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3answers
78 views

How to connect membrane tracks on a keyboard? Problem on photo

How to connect membrane tracks on a keyboard?
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1answer
63 views

What can I use for PCB casing?

The size of my board is 13,5x14,5. I need some casing which will be used on device in a room that -24°C . Another requirement is PCB should not be screwed so that it can be unpluggable when it is ...
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0answers
52 views

Pin Swap for an FMC Connector

What determines if you can swap pins on an FMC or not? I can technically swap the pins on a PCB footprint but the datasheets don't show the pin arrangement I'm about to make to make the trace routes ...
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0answers
55 views

How many times FR4 can be put under a reflow process?

I have a board with several designs, one component did not arrive so half of the PCB cannot be fabricated. In order not to waste time I would like to manufacture the designs that can be done but I don'...
0
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1answer
33 views

Copper areas on IMS PCB

I'm designing a board that hosts some LEDs. The datasheet of the LED shows some copper area in the nearby of the pads: I assume this is to improve dissipation. Because I'm going to make the PCB with ...
1
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1answer
96 views

I don't understand PCB fabrication copper thickness

In Eurocircuits I can select between 12um (end + -30um) to 105um (end + -130um), so in the worst case if I choose 12um can I have a thickness of 12-30 = -18um?
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3answers
91 views

PCB via size specification

I am designing a PCB in Kicad and I can define any diameter and hole of a via, but when I send it to be manufactured in china (JLCPCB, PCBWAY, etc) they can put any size of via or will it adjust to ...
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1answer
39 views

Gerber and silkscreen [closed]

I have a question regarding PCB manufacturing process and gerber files: if a made a change only on the silkscreen layer, can I send only this layer to the PCB manufacturer ?
1
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1answer
75 views

Is there a way to remove the Ref and Value markings from the preview and final print?

I just started using KiCad. The "Ref" and "Value" markings are getting quite frustrating. I can remove them from the design preview by disabling some layers, but when I open it in ...
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2answers
94 views

How prevalent is adoption of IEC and/or IPC standards among the major electronics manufacturers, especially CPU makers like Intel & AMD?

I spent part of the weekend learning about the history of the International Electrotechnical Commission (IEC) and IPC (originally an abbreviation for Institute of Printed Circuits) and their standards....
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1answer
25 views

PCB base material IPC4101/21 dielectric constant value

According to THIS webpage, for material IPC4101/21, the dielectric constant for impedance calculation is 4.0, can I trust this value? Because I am not finding other sources on web with the same ...
1
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1answer
114 views

Is there a preferable way to distribute layers in a 4 layer PCB?

I'm routing a PCB and, due to its small size, I'm thinking to use 4 layers. I'm planning to use top, bottom and two internal layers. Summarizing: TopLayer : GND plane Midlayer1: 5Vcc plane ...
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0answers
67 views

Help with PCB Layout Validation

My project consists of: DAQ device (USB1608-fs Plus: https://www.mccdaq.com/usb-data-acquisition/USB-1608FS-Plus-Series) which connects to my computer for data acquisition of up to 8 analog input ...
0
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1answer
33 views

Defining 4-layer PCB stack and base material IPC4101/21, impedance calculation value

For my 4-layer PCBs, I was suppling only this to the manufaturer: And was considering a dielectric constant of 4.6 to calculate the 50 ohms RF trace. And now I want to provide a more complete ...
1
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0answers
65 views

Strange Pattern on Automotive PCB

What is the purpose of the following shape / item on PCB. Could this be a FR4 or Conductive Layer quality control related thing? Top Side: Point inside the rectangle connected to some tray (The Point ...
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0answers
39 views

4 Layers PCB stackup

I'm working with 4 layers PCB and setting layers stackup. This is what Eagle shows me: Do I need to add also layers for solder mask or anything else required for production ?
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0answers
55 views

Layer thickness design for 4-layer boards

I'm designing a 4-layer PCB, containing a GPS module (u-blox NEO M9N) and a Taoglas antenna. The GPS antenna should be on the top layer, and the GPS receiver should be on the bottom layer. Besides the ...
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0answers
47 views

oscillators tolerance to ultrasonic cleaning

I use clock oscillators like ACHL-10.000MHZ in pretty much any board that contains a micro-controller. Recently, I've started using MEMS clock oscillators like AMPMAFB-33.0000T for their claimed ...
1
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0answers
29 views

Altium Tracks being overlapped

I'm using Altium designer (20.0.13) to edit my old PCB. In some of my PCBs the tracks are overlapped during routing and pushing. Don't know why this is happening even Rules> Electrical> tracks ...
1
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1answer
153 views

KiCad clearance vs JLCPCB clearance

From JLCPCB it lists many type of clearances. However in KiCad, it only lists one type of clearance, and I don't know what it is. 0.5mm is the highest value for clearance in JLCPCB and in KiCad it's ...
23
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4answers
2k views

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 ...
0
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1answer
85 views

Clearance between SMD components

I'm designing a compact PCB. It consists of non-addressable 5050 RGB LEDs. I'm concerned about how close they are. I'm going to use the SMD assembly service provided by JLCPLB. Should I change the ...
0
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1answer
48 views

Pitch calculations

I am trying to calculate pitch in the X and Y direction for this filter BPF-F150+. Are the below calculations correct? N+1/2(D)-1/2(M) 6.99+1.27-1.525 = 265.15mils Q+1/2(D)-1/2(M) 2.79+1.27-1.525 = 99....
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1answer
118 views

How to solder two-sided PCB

I am getting a small pick and place machine with a reflow oven. I am wondering how can I reflow two-sided PCBs. I have read many methods on the Internet like use two soldering pastes with different ...
2
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1answer
79 views

What could have caused this SMD capacitor failure?

I have an 0805 capacitor that has failed short circuit on a board. The maximum voltage it would see should be 16V. It has value 4.7uF, is rated to 25V and is X7R. I don't understand why it might have ...
4
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2answers
132 views

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 ...
0
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0answers
26 views

How Prepreg types and number of plies affect mechanical and thermal properties of the PCB

What are advantages and disadvantages when using a single ply of 7628 type prepreg as compared to say 2 plies of 1080 or a similar prepreg. I'm primarily concerned about any mechanical and/or thermal ...
0
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1answer
77 views

Heat sink installation in pcb production

If a design calls for a heat sink, such as on a TO-220 package, is it normal for an assembly shop to install it during production, or is that something that generally needs to be added on afterwards ...
0
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0answers
18 views

ACF bonding with vias on the pads

I plan to use ACF bonding (hot-bar) to connect a display panel to a simple FR4 PCB. As the circuit is very small and space optimized, I've positioned vias on some of the pads. If I would do use re-...
2
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1answer
85 views

Why have resistors on a signal line

I'm new to electronics so forgive me if this is an obvious question. I'm making a small circuit to read out a digimatic caliper. There are many designs only and I'm wondering why some components are ...
1
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1answer
108 views

What is the purpose of this plastic strip of tape on some circuit boards?

I was cleaning an old mechanical keyboard from ~2013 the other day and noticed this strip of thick plastic tape covering a circuit on the smaller PCB that the power connector is wired into. I have ...
4
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1answer
71 views

Prepreg thickness: ECAD specs vs. fabrication result

I have a question concerning the thickness of the prepreg layers in a PCB. If I understand correctly, the prepreg layers are used for "gluing" together the core(s) and copper foil layers. ...
7
votes
7answers
2k views

Why has the auto-router put my PCB traces on two different layers?

This is my first PCB design. I want to design the PCB layout of the following switched mode regulator: This is the resulting PCB layout in which I've placed my components and the auto-router function ...
0
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2answers
89 views

PCB designing consideration of high speed (0.5 Hz) relay load switching

Can this design cause any problems? I'm planning on switching 75W (220V) loads with this relays. I'm using 10 such relays and terminals (HB9500M). Note that it's highly unlikely all of the relays to ...
0
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1answer
45 views

Footprint to accomodate chips with different pin count

I am working on a PCB that (among other things) accomodates an MCU which is available either in a SOIC-14 or SOIC-16 package. Both packages are pin-compatible, the SOIC-14 is simply shorter to one ...
0
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5answers
179 views

Diy slider potentiometer?

Hi I need to use a 25cm (10inch) long slider potentiometer for my project. I can't find them anywhere so I'm thinking of getting a PCB made and putting some resistive material on it. My PCB ...
0
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2answers
70 views

PCB Trace Width : Common (LINE) Trace for 2 Relays

I am designing a simple switch controlled relay board. On board I have two 5Vdc 10Amp Sugar Cube Relays which will receive 230Vac from Terminal block connector and will be controlled with 5Vdc input ...
0
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1answer
20 views

Adding Holes to a custom EAGLE library

Currently, I am creating a custom EAGLE library for a relay that I couldn't find the CAD for. In the packag stage: I added the pads as seen in the picture and I'm having second thoughts about adding ...
7
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3answers
2k views

Is it possible to have rounded (fillet) edges on a PCB?

I would like to know if its possible to have the PCB edges rounded. No, I'm not talking about having round corners, or shapes in the PCB. What I want to know if there are milling bits that allow to ...
0
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1answer
44 views

Autodesk EAGLE Routing of STM32WLE with tiny UFBGA73 package

I would like to do the routing of the stm32wle5jbi6 chip that comes in a tiny UFBGA73 package. Please see the datasheet here: https://www.mouser.de/datasheet/2/389/dm00648230-1799409.pdf The ...
0
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3answers
264 views

Why is silicon used as PCBs?

I know why silicon is used for ICs and transistors in general due to its doping features. But I don't know why we use silicon as a PCBs, all we need is to isolate pins from each other in a PCB, right? ...
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0answers
25 views

Autodesk Eagle: How to design predetermined breaking points / line of breakage

How can you best design a line of breakage in Autodesk EAGLE that makes it possible to break the individual PCBs easy by hand? Please see here what I would like to do (blue lines are the lines of ...
0
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1answer
73 views

PCB photoresist method etching incomplete - only etched around borders of traces

I'm trying to make PCBs for the first time, but I hit a roadblock and don't know how to fix the problem. I etched my 3rd developing attempt, but it looks like only the border around the traces was ...
1
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2answers
136 views

How are PCBs with castellated pins arranged in a panel?

Can anyone please describe to me how PCBs with castellated pins are arranged in a panel. My understanding is that castellated pins are formed by drilling the edge of a PCB then plating, similar to a ...
0
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1answer
84 views

First Hands-on PCB

I want to print a board from open-source hardware found here. I don't know how to go about filling in the specifications on the website. It may look so straightforward and direct, but I don't have ...

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