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Questions tagged [trace]

Lanes of copper on a printed circuit board, for carrying current or signals between pads

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PCB trace width for high current motor driver

This post is a continuation of Trace width for PCB motor driver board, with a few follow-ups and questions. Firstly, I'd like to mention again that the motors I want to use have a maximum current of 7 ...
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Trace width for PCB motor driver board

This is my first time working on a PCB microcontroller board. I'm working on a project that involves the control of several DC motors with encoders, and I've opted to make my own microcontroller board ...
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PCB microprocessor 16MHz oscillator layout feedback

I thought I'd give an update to the changes I've made for my 2 layer PCB regarding the 16MHz crystal oscillator that I've added. Yes, this is a continuation of PCB layout for 16 MHz crystal oscillator....
hdaniu's user avatar
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PCB layout for 16 MHz crystal oscillator

I'm barely getting started with PCB designing. I'm working on my dissertation project and I want to develop a PCB board with an integrated microcontroller (ATmega2560-16AU) and some motor drivers as ...
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Choosing trace width and spacing

What is the standard for choosing trace width and spacing? I keep finding various and different answers. My goal is to go as small as possible for my board. Everything is low current; nothing should ...
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Traces condition of old Nokia logic board

The following are the pics of traces on logic board of Nokia. The traces are where display connector was attached but somehow the 10-pin connector got torn off exposing the traces. I want to know if ...
user_04248753498's user avatar
2 votes
2 answers
806 views

Why have some wide trace at the begninning, but smaller trace at the end?

Why have some wide trace at the begninning, but smaller trace at the end? This example shows traces that goes into a BGA processor with pitch 0.5mm. From the begninning it's 0.09mm in width. At the ...
euraad's user avatar
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How is length adjustment calculated if you have a pull-up resistor?

Let's say that I have a point A and a point B. In between there must be a conductor. It must have a certain length. But I have to hang on to a pull-up resistor as well. But I can do that at point C. ...
euraad's user avatar
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LED PWM traces splitting reference power plane adjacent to bottom 5V DC supply ground zone on 4-layer PCB

I have almost finished my first 4-layer PCB design using Signal(Top)-Ground-Power-Signal(Bottom) stack-up and have some questions before sending it to production. Due to the very tight space on the ...
Semih's user avatar
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Frequency limit for routing <32MHz digital signals adjacent to one another on different layers, 4 layer PCB

I'm running an 3.3V SPI device with an SPI clock frequency rated up to 10 MHz, with some additional digital outputs/inputs to/from a microcontroller that is clocked at 32 MHz. Due to some space ...
plu's user avatar
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Running traces across THT footprints

Will this work, knowing that I'm running traces across THT footprints? Kicad lets me do it, but will PCB manufacturers be able to print the board? On the other hand I had no other choice as I might ...
brunobhr's user avatar
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Proper bending of trace in high frequency coupler question

A coupler 32-38 GHz was designed. I need to bend the legs in an optimal way so I won't get reflections. My bend is 45 degrees. Is there a logic I could use to find the optimal distance of the bended ...
Josh23's user avatar
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PCB trace impedance test measure

I have PCBA for which I want to measure the loop impedance between the power connector and gnd ones. How can I do this test if the passive elements, IC and other elements already attached on the PCB?
Alan Alan's user avatar
1 vote
1 answer
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Ghost line/barrier showing in Altium deginer

I am having a problem where there's an area (line) that appears only while running traces and on the draftsman document. the ghost line/region does not show up on any of the layers, I toggled all the ...
queTak's user avatar
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Custom game controller - button trace conductive coating

I'm attempting to make a custom controller for an old game console, and I'm looking for a way to replicate the conductive coating on the traces for the button pads: I'm harvesting the silicone pads ...
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Impedance adaptation for two frequencies

I just received my first custom RF board that use 2.4 GHz and 5 GHz with a diplexer. Unfortunately, it appears that the used PCB stack-up wasn't really what I expected so my traces are not 50 Ω, but ...
BEN's user avatar
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How do I handle a component with pin spacings smaller than the necessary trace width?

I'm designing a board using a TPS2113 power mux in a TTSOP package to deliver ~1A from plug power or a battery to my board. My calculated trace width for this current is 25-30 mil, however the pins of ...
harmon cleary's user avatar
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1 answer
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Kicad telling me to connect pads together when I feel it's incorrect

Hey all I am wondering if this is the correct way to trace a fuse holder on my pcb. I would imagine that the top 2 pads connected to each other and the bottom 2 pads connected to each other. Running a ...
StealthRT's user avatar
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24 votes
1 answer
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Why is there a difference between pad-to-trace and trace-to-trace clearance?

I am looking to have a PCB produced for a personal project of mine. I have to use very thin traces and tight clearances to escape pads on a BGA chip on my board. I was looking at the capabilities of ...
elialm's user avatar
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2 answers
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Layout- Should the output and input traces of this hex inverter be superposed

I am using this hex inverter in one of my pcbs; the inputs are TTLs, so fast switching signals going from 0 to 5V very fast ( I don't know yet the rise time of these signals, maybe 10 us ?). Both ...
DarkBulle's user avatar
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Can parasitic capacitances be decoupled?

I was working with some IC that has a bus that is really sensitive to trace capacitance and cannot be loaded with more than 8.5 pF. I have to bifurcate the trace to an ADC because I need to see what ...
murisio's user avatar
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1 answer
146 views

Power traces in a 2 layer PCB

I have a two layer PCB, with signal traces and power traces on the top layer and a ground plane on the bottom layer. The top layer also has a ground plane extending over the space where there are no ...
UnstableDynamics's user avatar
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1 answer
353 views

Kicad 7 - Automatically change all traces widths

In my pcb layout, I have two different trace widths. Both of these have to be changed. Is there a way to do this automatically? Meaning, all trace widths of size X should become Y, while all trace ...
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Ideal track width

I created a failed PCB. One of the reasons could be that I had tight track widths. I was advised to create larger track widths, where high {voltages, current} exists. I placed the two values in ...
user1584421's user avatar
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2 votes
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Temperature rise for multiple layers of PCB

I'd like to better understand what to expect when carrying current on multiple layers of a PCB. I've used trace width calculators to determine how wide a trace needs to be to carry a given amount of ...
mattmunee's user avatar
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3 answers
202 views

Changing trace width on a PCB after reaching component pad

People advise not to change trace widths on a PCB because of the change in impedance of the trace and possible signal reflections for example. Does that still hold true when the trace reaches a ...
DarkBulle's user avatar
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2 answers
120 views

Trace widths and current capability Altium

I was working on a PCB where there was a single DC input with two traces +ve and -ve. At one end there was a connection to a motor which requires 40A. The traces of the DC input were 100mil and 1oz. ...
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337 views

Altium Designer: Is there anything similar to trim in AutoCAD? Is there a better alternative method to remove stubs?

Let's say I have the track/trace below. I want to remove the track stub so it ends at the via. I could click on the end vertex of the track and drag the stub into the via until its gone, but with much ...
Senthil Seveelavanan's user avatar
1 vote
1 answer
174 views

Tracing to see if IC is TM1650 or something else

I am tying to determine where the PCB traces are going in order to figure out if this is using the TM1650 or something else. Most of these (this is from a pool pump) uses the TM1650 but there are some ...
StealthRT's user avatar
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High current traces (up to 60 A) routing problem

I need to design a power inverter that might have up to 60 A of current flowing through the leg IGBTs and still could not figure out the best way out for that amount of current. The DC bus voltage may ...
Iron Maiden's user avatar
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2 votes
1 answer
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How to change the trace width in an accordian object in alitum 22 without deleting the trace first?

I have several accordion objects in altium. I need to change the trace width. If the trace is selected it won't show up the properties window to change the width. The only way I have found to change ...
Voltage Spike's user avatar
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3 answers
153 views

How can I determine the dimensions of a spiral trace on a PCB?

I was designing a circuit that contains some analog signals along with signals of relatively low frequency (2.5 kHz) and I was reading a bit about norms, standards, and good practices for the design ...
WalterPH's user avatar
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7 votes
6 answers
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How do high current paths work in PCB design?

Using a calculator like this one I see that the trace width required for 10 A is 9.36 mm at 2 oz (highest JLCPCB offers). My IRLZ44N transistor has 2.54 mm spaced legs, so how does putting two 10 mm ...
php_nub_qq's user avatar
8 votes
2 answers
1k views

Maximum current through PCB traces

I am currently looking at a layout and I have a trace which has to sustain this current waveform (single pulse) according to the simulation: As you can see, the current is passing through the trace ...
Jess's user avatar
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1 vote
1 answer
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How to design PCB traces for high-current applications

I am trying to make a WiFi switch using the ESP32 MCU. The PCB I am building will be switching high-power applicances, such as a kettle (which can draw around 14 A @ 230 VAC). The relay I chose is the ...
JoeyB's user avatar
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2 votes
1 answer
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How to size track width for AC application

I want to run AC volatge through my relay shown below: My track width is 2mm for the COM, N/O, and N/C pins. These tracks go from the relay to the 3-pin connector. The relay (G5LE-14-12DC) is found ...
JoeyB's user avatar
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10 votes
4 answers
2k views

Connecting pads with the same functionality belonging to one chip

I have a question about routing style of pads with the same functionality belonging to one chip. I draw a picture in Paint (fictional IC; let it be the SOIC8 footprint). GND is only as example (it can ...
Karlsson's user avatar
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1 vote
3 answers
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PCB track width considerations based on starting current draw

I am making a PCB for which I need advice on widths of power traces. I am powering a 3A pump and a 1A solenoid valve through this PCB. I am drawing widths based on the table below. 3A + 1A = 4A. So ...
DribbleNibble's user avatar
5 votes
3 answers
675 views

Splitting and rejoining a trace to reduce resistance

I'm teaching an embedded systems class and a question came up I've never considered. We were discussing the idea of "necking down" a trace to get through a tight spot and someone asked if ...
Mark Brehob's user avatar
4 votes
5 answers
823 views

PCB design for air quality measurements

I want to make a simple PCB with the following components: 1x CO₂, humidity and temperature sensor - SCD40 (Qwiic) from Sparkfun 1x 1.3 inch OLED display I2C SSH1106 from AZDelivery 1x TinyS3 (ESP32-...
Speedx's user avatar
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0 answers
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How to map equivalent AWG wire gauge to PCB trace width?

There are some online calculators that let you calculate trace width based on PCB trace characteristics e.g. this one from digikey. If there is a terminal connector on the PCB that connects solid AWG ...
MandoMando's user avatar
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3 answers
316 views

PCB power plane copper and lamination thickness

One of the boards I have has these surface traces that run a lot of current through. I believe they are called power planes. Does anyone know a typical copper thickness (35 um?) ? Also, what is the ...
FlakR's user avatar
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1 vote
2 answers
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How can I repair peeled through-hole solder pads and trace?

The top and bottom through-pads were torn off in a botched desoldering. The bottom pad’s trace was peeled to the solder joint.
user316395's user avatar
-1 votes
1 answer
164 views

How to import wiring csv into cad?

I have a .csv file which contains the (complicated) points of the paths that I need my wires to trace. I would normally use EasyEda for making grbl files, but I don't think it is capable. Is there a ...
user1402154's user avatar
2 votes
2 answers
679 views

Altium trace symmetry

I am designing a board and the traces look like this: Is there any hotkey to make the traces be similar? I.e. the vertical lengths are uniformly varying, the distance between the diagonal tracks is ...
Marko Jurisic's user avatar
0 votes
5 answers
1k views

Is voltage important for calculating PCB trace width? If not, why?

As per the IPC 2221A the formula for calculating PCB trace width follow the process given below; First, the area is calculated: Area[mils²] = (Current[Amps]/(k*(Temp_Rise[°C])b))^(1/c) Then, the width ...
Gurunath Todkari's user avatar
-1 votes
1 answer
67 views

Instrumentation Tools for Collecting Data in DRAM accesses

We can use instrumentation tools, such as Pin tool, to collect memory accesses of an application running on a system. The type (read or write) and memory address can be collected. How about data? Can ...
Arghavan Mohammadhassani's user avatar
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1 answer
351 views

FR4, 1 oz. copper, PCB trace width for 48V/8A, pulsed (8 ms pulse length, up to 20Hz)?

I would like to determine suitable trace width for the pulses shown. Other details: The application is to pulse a solenoid; board size is 100mm x 100mm. An LM317 charges a 1000uF cap and the cap is ...
Mike's user avatar
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3 votes
1 answer
81 views

Why is this recommended in PCB layout: 2 leads between pads

Why is the connection recommended as in the top picture?
İbrahim ATİKER's user avatar
4 votes
0 answers
62 views

Power Circuit for TB9051FTG Trace Width

I am working on a PCB with a Toshiba motor driver chip, TB9051FTG. https://www.digikey.com/en/products/detail/toshiba-semiconductor-and-storage/TB9051FTG-EL/10123940 The datasheet mentions the ...
Jack Frye's user avatar
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