For a pure inductor of inductance L Henries, the impedance ZL= jωL Ohms. 15-21. Microstrip Line Calculator Description The microstrip calculator determines the width and length of a microstrip line for a given characteristic impedance (Zo) and electrical length or vice versa. Menu. 11 RF / Microwave Design - Basics. ϵr ϵ r = substrate dielectric. 031. 020. – Tony Stewart EE75 Jun 8, 2021 at 2:16 Add a comment 1 Answer Sorted by: 2 Results from a trace width calculator I use: Enter the relative permitivity, width of the trace, the ground plane spacing, and the substrate thickness to calculate the characteristic impedance. High-speed designs carry a requirement for controlled impedance, crosstalk control, and the. The recommended stitching distance between vias should be at most λ/4, with λ/10 as an optimum. c = 0. What is Microstrip Impedance? Results for Internal Layers: Results for External Layers in Air: Notes: The trace width is calculated as follows: First, the Area is calculated: Area [mils^2] = (Current [Amps]/ (k* (Temp_Rise [deg. H 1 H 1 = subtrate height 1. Therefore, the trace height and width you choose for 1 GHz will be a slightly different impedance at 10 GHz (if you need to worry about the difference, you probably already know about the difference!) | Created: November 22, 2021 | Updated: June 25, 2023 Table of Contents Differential Impedance Defined Formulas for Differential Impedance Should You Use Characteristic or Odd-mode Impedance? Calculating Width and Spacing Comparing Width and Spacing for Differential Microstrips When it comes to the equations, you simply need to use the following: W = \frac {A} {1. 048, b = 0. This online microstrip impedance calculator calculates the characteristic impedance of the microstrip (Ω), W/H ratio, and effective dielectric constant (εe) by entering the value of dielectric material relative permittivity (εr), the width of the copper trace (W), and dielectric height (H). INPUT DATA. 57 mm. W W is the PCB trace width, in thousands of an inch (mil); A. W W = trace width. To find out the width of the microstrip, enter the target impedance (Zo), trace thickness (t), dielectric thickness (h), and relative dielectric constant (εr). Like our microstrip line impedance calculator, all of our RF calculators allow SI prefix input. Formula First, calculate the Area: Then, calculate the Width: For IPC-2221 internal layers: k = 0. PCB traces - a brief overview You may use this online tool to calculate an estimate of the minimum trace width for a given current and copper weight. (I did not found more precise information on Eurocircuit website for non RF pool circuit) Microstip lines The impedance depends on the net width, the net height, the board type and so one. Short traces with heatsinking to planes do not get as hot. 7 10^(-6) Ohm-cm. 8 substrates. *Minimizes Return Loss / VSWR. H eff = H 1 + H 2 2 H e f f = H 1 + H 2 2. MAM - February 24, 2006This tool uses formulas from IPC-2221 to calculate the width of a copper printed circuit board conductor or "trace" required to carry a given current while keeping the resulting increase in trace temperature below a specified limit. 725 where k, b, and c are constants resulting from curve fitting to the IPC-2221 curves. t. C7, C9, C10 are tuning components - not all will be caps and not all will be fitted in the final design. Simons, "Coplanar Waveguide Circuits, Components, and Systems", Wiley. Single-Ended Impedance. . Therefore, the trace height and width you choose for 1 GHz will be a slightly different impedance at 10 GHz (if you need to worry about the difference, you probably already know about the difference!) | Created: November 22, 2021 | Updated: June 25, 2023 Table of Contents Differential Impedance Defined Formulas for Differential Impedance Should You Use Characteristic or Odd-mode Impedance? Calculating Width and Spacing Comparing Width and Spacing for Differential Microstrips This tool calculates the matching network necessary to terminate a line of the specified characteristic impedence (Z o) in a specific complex load impedence (R L + jX L) at a specified frequency. 8 Mils and the FR-4 dielectric of 3. Calculation tip for defined Z 0 as well as Z Diff. For 2. Read any guide on PCB design, and you’ll see mentions of 50 Ohm impedance, track widths required to reach said impedance, and. trace width for a characteristic impedance of 50 Ohms on Dk = 4. W W = trace width. Modeling approximation can be used to design the microstrip trace. 378tA. Striplines, in many cases, can be used where microstrips would be, so long as size is not a constraint. where. g. Impedances can be combined in series and parallel in the same manner as resistors. Note: Units do not matter for this calculation as long as they are consistent. C])^b))^ (1/c) Then, the Width is calculated: Width [mils] = Area [mils^2]/ (Thickness [oz]*1. Input Data Field Value Units Current (max. 44, c = 0. 024, b = 0. Therefore, the trace height and width you choose for 1 GHz will be a slightly different impedance at 10 GHz (if you need to worry about the difference, you probably already know about the difference!)Description. Edge-Coupled Microstrip. In fact, striplines often make components such as band-pass filter's more accurately, with more symmetric roll-off and no lower cutoff frequency. It gave me a trace width of 6. The microstrip calculator determines the width and length of a microstrip line for a given characteristic impedance (Zo) and electrical length or vice versa. Using AppCAD 4. Does this combinations (45/8 mils) looks correct for you? What more can I do to improve my layout? Regards. 048, b = 0. 100°C) Ambient Temperature Conductor Length The following images show the calculations for 50ohm and 100ohm impedances based on our standard board thickness and copper weight. The Differential microstrip impedance calculator is used to compute the differential (Zd) and single-ended impedance (Zo) of an edge-coupled microstrip line just by entering the width, separation and thickness of the trace along with the dielectric thickness and constant of the coupled line. Common values: Thickness: 1 oz Ambient: 25 C Temp rise: 10 C Minimum Trace Width For this reason, trace width is important in the design of striplines. biswajit das - February 15, 2006 I want to know about high-speed PCB design. The same calculation can be applied to bus bars. To calculate PCB trace resistance, The 50 ohm PCB trace calculator is designed considering the following formula. Common values: Thickness: 1 oz Ambient: 25 C Temp rise: 10 C Minimum Trace Width The Differential microstrip impedance calculator is used to compute the differential (Zd) and single-ended impedance (Zo) of an edge-coupled microstrip line just by entering the width, separation and thickness of the trace along with the dielectric thickness and constant of the coupled line. 1 I'm trying to design a 50Ω coplanar waveguide to connect the output of a LoRa module to a SMD metal antenna. You can calculate the trace width using online trace impedance calculators or microstrip impedance calculators. A A is the cross section area, in mils 2; and. 9GHz band inject about 48V-5A DC. 4 mil-dielectric costant: 4. 4 (assume 4,30). 5 (assume 4,35) ; for 868MHz 4. 062. For the signal trace of width W and thickness T, separated by distance H from a ground (or power) plane by a PCB dielectric with dielectric constant εr, the characteristic impedance isWidth trace: 10 mil-gap betwen trace and Ground: 10 mil-height: PCB 75. Equation R = ρ ⋅ L T ⋅W ⋅[1 + α⋅(temp − 25)] R = ρ ⋅ L T ⋅ W ⋅ [ 1 + α ⋅ ( t e m p − 25)] Where: ρ=resistivity L= length W=trace width. For more information see About our calculators This calculator helps you compute the characteristic impedance of an asymmetric stripline Inputs Trace Thickness Substrate Height 1 Substrate Height 2 Trace Width Substrate Dielectric Output Impedance: Ohms Overview 10 posts PCB trace 50 ohm impedence #86802 By lucasvickers - Wed Dec 09, 2009 4:57 pm Hello I am trying to create a PCB trace line from a GPS receiver to a GPS patch antenna. transparent view: When it comes to the equations, you simply need to use the following: W = \frac {A} {1. where. Includes information on how trace width is calculated. Common consideration. While this calculator will provide a baseline, any final design considerations should be made towards loss, dispersion, copper roughness, phase shift, etc. t. Microstrip lines have three parameters that we can change to achieve 50 ohm impedance: copper thickness (T) substrate thickness (T) track width (W) Due to design constraints, there is only one parameter (track width,) left to achieve 50 ohm. 7GHz - 1. W. This tool calculates the matching network necessary to terminate a line of the specified characteristic impedence (Z o) in a specific complex load impedence (R L + jX L) at a specified frequency. where. 2uS, And the wavelength (λ) = C/f = 3*10^8 / 50*10^6 = 6m Where, C is the speed of light. Common values: Thickness: 1 oz Ambient: 25 C Temp rise: 10 C Minimum Trace Width This online microstrip impedance calculator calculates the characteristic impedance of the microstrip (Ω), W/H ratio, and effective dielectric constant (εe) by entering the value of dielectric material relative permittivity (εr), the width of the copper trace (W), and dielectric height (H). Z 0 now meets your requirements. What is Microstrip Impedance? Formula First, calculate the Area: Then, calculate the Width: For IPC-2221 internal layers: k = 0. Vias are green and both copper pours are connected to ground. 12cm, with 1. 7 -conductor: copper-FREQUENCY 2. So, for longer trace lengths and higher frequencies stitching becomes more important than in this case with a very short trace length. 906mil. 5. We recommend the software from. Z0,air Z 0, a i r = characteristic impedance of air. Formula First, calculate the Area: Then, calculate the Width: For IPC-2221 internal layers: k = 0. Results for Internal Layers: Results for External Layers in Air: Notes: The trace width is calculated as follows: First, the Area is calculated: Area [mils^2] = (Current [Amps]/ (k* (Temp_Rise [deg. This tool, based on the formulas and graphs contained in the standard document [1], calculates the resistance of a copper PCB trace (also known as or track), knowing the trace length, width, thickness and the ambient temperature. The most. Here, Trace thickness, T=1. The stripline impedance calculator provided below is useful for gaining an initial estimate of trace impedance for striplines. Striplines, in many cases, can be used where microstrips would be, so long as size is not a constraint. What is Microstrip Impedance? How To Calculate The PCB Trace Width Through A Trace Width Calculator. g. 725 For IPC-2221 external layers: k = 0. Dielectric thickness vs. 725 For IPC-2221 external layers: k = 0. 093. The substrate parameters (ε r and h) and the frequency of interest are required. 048, b = 0. t. What Is Important About PCB 50 Ohm Trace Widths? As high speed transmission line speeds have increased, signal rise and fall times have decreased. The same calculation can be applied to bus bars. I wanted to use Altium to calculate the width of the trace automatically, so that it had a 50 Ohm impedance. - Electrical Engineering Stack Exchange How to route a trace on PCB with 50 Ohm impedance? Ask Question Asked 7 years, 7 months ago Modified 7 years, 7 months ago Viewed 5k times 5 I used some online calculator to calculate parameters of trace so it has 50 Ohm impedance. thus allowing you to calculate a microstrip’s height and width ratio, impedance and. 5GHz and needs a 50 ohm impedance line. 15 and 4. The surface finish is neglected. The substrate parameters (ε r and h) and the frequency of interest are required. If, in addition to a differential impedance (Z Diff), you also need a defined Z 0, proceed as follows:. except for W, the width of the signal trace. 378 mils. *As Trace Width Increases, Trace Impedance Decreases (Thickness has Min Effect). T T = trace thickness. Dielectric thickness vs. The above screen shows that the target parameter is 'Trace Width (W)' and the fixed parameters are 50 ohm Char. The dielectric constant of a material IS slightly frequency dependent. Enter the relative permitivity, width of the trace, the ground plane spacing, and the substrate thickness to calculate the characteristic impedance. t t is the trace thickness, in oz/ft 2. Simons, "Coplanar Waveguide Circuits, Components, and Systems", Wiley, 2001, pp. I used the impedance calculator in Altium with the trace type selected as "single" which I believe is Microstrip. The history of 50 Ohm impedance goes back to the late 1920s/early 1930s, when the telecom industry was in its infancy. 2 Layers, 31mil Stackup: 2 Layers, 31mil Single-ended Impedance Sample Calculation (50Ω): 2 Layers, 31mil Differential Impedance Sample Calculation (100Ω): 4 Layers, 31mil Stackup: The characteristic impedance (Z o) of a microstrip transmission line can be calculated using the active calculator or the equations at the bottom of the page. A = {igg (frac {I} {kT_ { ext {rise}}^b}igg)}^ {frac {1} {c}} A = (kT risebI)c1. 2) 50 Ohms is 50 Ohms (kind of). Your trace width and spacing calculate out as a 50 ohm trace on a couple of calculators I checked, so that should be okay. To find out the width of the microstrip, enter the target impedance (Zo), trace thickness (t), dielectric thickness (h), and relative dielectric constant (εr). Note: Units do not matter for this calculation as long as they are consistent. Figure 2. It is also easy to find parts (such as filters, amplifiers, antennas, etc) with 50 ohms characteristic input/output. A A is the cross section area, in mils 2; and. 125; Tolerances; Certifications; RoHS - Lead Free; Electrical Test;. Single-Ended Impedance The trace impedance (single-ended) in an individual trace is normally calculated by ignoring any neighboring traces, so no coupling to other conductors in the design will be included. Here, = resistivity at copper = 1. 035mm and Er = 4. The trace width calculator is more geared towards long traces. jds - Yes, you are right. 429 Mils. This calculator uses JavaScript and will function in most modern browsers. W. 062. Use an online differential stripline impedance calculator Calculating Differential vs. Home;. W. PCB Trace Width Calculator. In the case of 1 oz copper, you have to follow this formula: Trace width, w= A/T x 1. Menu. 020. H 1 H 1 = subtrate height 1. 020. OrCAD PCB Designer is one of the most versatile PCB design systems that you can get, and it has the impedance calculator technology you need to determine. H 2 H 2 = subtrate height 2. There are many demands placed on PCB stackup design. It mentions formula or equations used in this Microstrip Width Calculator. 378t} W = 1. 378 [mils/oz]) H eff = H 1 + H 2 2 H e f f = H 1 + H 2 2. In my layer stack manager, I have the following: Note that Altium calculates that the trace should be ~100 mil wide, which is significantly higher than what the datasheet suggests (0. The microstrip is a very simple yet useful way to create a transmission line with a PCB. Engineers were designing air-filled coaxial cables for radio transmitters designed to. Calculate Z 0 as normal Microstrip, until you get the desired value, e. The characteristic impedance (Z o) of coplanar waveguide with ground or microstrip lines with signal side ground plane can be calculated using the active calculator or the equations at the bottom of the page. What is Microstrip Impedance? For this reason, trace width is important in the design of striplines. This page covers Microstrip Width Calculator. 378t} W = 1. For example, if you wish to input "25000000", just type "25M" instead. In this calculator, we will show you how to calculate the trace width of a PCB for both internal and external traces. PCB Impedance Calculator and Stackup Design in Altium Designer Zachariah Peterson | Created: November 9, 2020 | Updated: July 15, 2021 Table of Contents How to Calculate PCB Trace Impedance in Your Stackup PCB Impedance Calculations With IPC-2141 Formulas Wadell's Impedance Equations How Your PCB Stackup Determines Impedance This online microstrip impedance calculator calculates the characteristic impedance of the microstrip (Ω), W/H ratio, and effective dielectric constant (εe) by entering the value of dielectric material relative permittivity (εr), the width of the copper trace (W), and dielectric height (H). With PCBWay impedance calculator, you can calculate the approximate impedance of your PCB / high frequency circuit board. Relative Dielectric Constant ( εr ): Track Width. 45ghz. Calculate the width of a Microstrip Transmission Line Target Impedance (Z0) Trace Thickness (t) Dielectric Thickness (h) Relative Dielectric Constant (εr) Calculate Reset Result Width (w) See full list on allaboutcircuits. The above basic example was to show you how you can calculate the wavelength for a certain frequency IPC 2141 Trace Impedance Calculator. t t is the trace thickness, in oz/ft 2. Enter the relative permitivity, width of the trace, the ground plane spacing, and the substrate thickness to calculate the characteristic impedance. 062. T= Experimental temperature = room temperature (25⁰C) L= Length of trace. 031. This online microstrip impedance calculator calculates the characteristic impedance of the microstrip (Ω), W/H ratio, and effective dielectric constant (εe) by entering the value of dielectric material relative permittivity (εr), the width of the copper trace (W), and dielectric height (H). microstrip/CPW, and a single trace to see whether the 50 ohms is working. **Note: Like our stripline impedance calculator, all of our RF calculators allow SI prefix input. ; Apply the values to the differential calculation, e. For example, if you wish to input "25000000", just type "25M" instead. 4. I used some online calculator to calculate parameters of trace so it has 50 Ohm impedance. Coplanar Waveguide With Ground Characteristic Impedance Calculator. 44, c = 0. The impedance of the line is mainly depending on your PCB characteristics. This tool, based on the formulas and graphs contained in the standard document [1], calculates the resistance of a copper PCB trace (also known as or track), knowing the trace length, width, thickness and the ambient temperature. If you want a specific trace width and material, your only other option to get to 50 Ohm impedance is to use a non-standard thickness. 378tA. Synthesize When it comes to the equations, you simply need to use the following: W = \frac {A} {1. Use an online differential microstrip impedance calculator; Use an online differential stripline impedance calculator; Calculating Differential vs. Now with the values shown above for the characteristic impedance and the trace width/spacing pairs, we can determine the spacing that causes the trace width for a 50 Ohm odd-mode impedance to also produce a 50 Ohm. Therefore, the trace height and width you choose for 1 GHz will be a slightly different impedance at 10 GHz (if you need to worry about the difference, you probably already know about the difference!) 1 50 Ohms depends on track width to gap, so if you want 50 ohms reduce the gnd plane gap significantly towards the trace width you need. 378 [mils/oz]) Using AppCAD 4. 725 where k, b, and c are constants resulting from curve fitting to the IPC-2221 curves. Microstrip lines have three parameters that we can change to achieve 50 ohm impedance: copper thickness (T) substrate thickness (T) track width (W) Due to design constraints, there is only one parameter (track width,) left to achieve 50 ohm. Microstrip Impedance Calculator. com This calculator helps you compute the characteristic impedance of a microstrip. Eq. The IPC-2141 trace Impedance calculator will help make initial design easier by allowing the user to input basic parameters and get a calculated impedance according to the IPC-2141 standard. 024, b = 0. Reference: R. 378tA. There are some advantages to using a microstrip. 725 For IPC-2221 external layers: k = 0. Also I got almost the same result on the online calculator. The calculator is set up to handle an asymmetric arrangement, where traces. The IPC-2141 trace Impedance calculator will help make initial design easier by allowing the user to input basic parameters and get a. PCB Trace Width Calculator. 50 Ohm Coax Cables; 75 Ohm Coax Cables; 78 Ohm Twinax Cables; 93 Ohm Coax Cables;. ing (50 ohm out/ 50 ohm line/ 50 ohm in). 2) 50 Ohms is 50 Ohms (kind of). 2 and 4. Impedance (Zdiff) DK value; Track width; Track height; Isolation height;Coplanar Waveguide Calculator. PCB Trace Width Calculator. Now with the values shown above for the characteristic impedance and the trace width/spacing pairs, we can determine the spacing that causes the trace width for a 50 Ohm odd-mode impedance to also produce a 50 Ohm characteristic. This tool will also compute the resistance of the stripline, the voltage drop on it, and the resulting power dissipation. Does this combinations (45/8 mils) looks correct for you? What more can I do to improve my layout? Regards. Where: Z0 Z 0 = characteristic impedance of the asymmetric stripline in ohms (Ω). Introduction The microstrip is a very simple yet useful way to create a transmission line with a PCB. Controlled Impedance; PrePreg Chart. t t is the trace thickness, in oz/ft 2. For a 433MHz line it will be between 4. This tool will also compute the resistance of the stripline, the voltage drop on it, and the resulting power dissipation. The dielectric constant of a material IS slightly frequency dependent. 1 Trophy points 1 Activity points 89 Hi all, I designed my 1st RF PCB for a high pass filter with a bias tee circuit to work in the 1. Calculation Trace Width: Dielectric Height: Trace Thickness: Result: A stripline consists of a central conductor surrounded by dielectric material between two groundplanes. 093. Home;. 5. Simons, "Coplanar Waveguide Circuits, Components, and Systems", Wiley, 2001, pp. Striplines, in many cases, can be used. H 2 H 2 = subtrate height 2. 8 substrates. Impedance Calculation. Figure 2. 44, c = 0. Includes information on how trace width is calculated. 725 where k, b, and c are constants resulting from curve fitting to the IPC-2221 curves. t t is the trace thickness, in oz/ft 2. Reference: R. 37 mils (for 1 Oz copper PCB), A= Cross-sectional. 2) 50 Ohms is 50 Ohms (kind of). Characteristic impedance of a transmission line Calculation Trace Width: Dielectric Height: Trace Thickness: Result: A stripline consists of a central conductor surrounded by dielectric material between two groundplanes. The two images below show the top layer (red) and bottom layer (blue). The trace impedance (single-ended) in an individual trace is normally calculated by ignoring any neighboring traces, so no coupling to other conductors in the. Calculation Trace Width: Dielectric Height: Trace Thickness: Result: A stripline consists of a central conductor surrounded by dielectric material between two groundplanes. 378t} W = 1. 2-side PCB, one side with signals, the other with GND. 9843 mil-thickness: 1. A higher current requires thicker traces while a thicker copper weight allows for thinner traces. 44, c = 0. The trace impedance on your PCB that carries RF signals can also be made 50 ohms by adjusting its width appropriately. But I see a couple of other issues you should look out for: In the original design,. For a pure resistor of resistance R Ohms, the impedance ZR = R Ohms. Viewed 21k times 6 I have a question. 44, c = 0. Controlled Impedance; PrePreg Chart. Where: Z0 Z 0 = characteristic impedance of the asymmetric stripline in ohms (Ω). trace width for a characteristic impedance of 50 Ohms on Dk = 4. Adjust the distance "s" until. This antenna operates at 1. Please give me some documents about high-speed PCB design. We will also tell you by how much you can expect the temperature of your PCB trace to rise by, as well as the resistance and maximum current that the trace can stand. Imagine that I need to have a 50 ohms impedance in a PCB trace. The value of k k depends on the location of the. Equations given later to Calculate Effective Relative ( ). C])^b))^ (1/c) Then, the Width is calculated: Width [mils] = Area [mils^2]/ (Thickness [oz]*1. 50 Ohm Trace Width Calculator Formula. Also I got almost the same result on the online calculator. For a quarter wavelength antenna, it becomes λ /4 to be fixed. One obvious mistake is the large trace width there, which gives a lot of shunt capacitance at the input. Note: Units do not matter for this calculation as long as they are consistent. 5mm, T=0. A A is the cross section area, in mils 2; and. Z0,air Z 0, a i r = characteristic impedance of air. Impedance, Board Height of 6 Mils, Trace Thickness of 2. It supports both balanced and unbalanced lines. The dielectric constant of a material IS slightly frequency dependent. 093. using T=1/f Where T = Time F = frequency So, for an antenna, operating at 50MHz, t =1/f = 0. W W is the PCB trace width, in thousands of an inch (mil); A. There are some advantages to using a microstrip transmission line over other alternatives. 75 mm=30 mil). It supports both balanced and unbalanced lines. I was told that copper at 1Ghz has a Dielectric Constant of roughly 3. The dielectric constant of a material IS slightly frequency dependent. For example, Mini PCIe cards are 1 mm thick rather than the standard 1. Calculate the width of a Microstrip Transmission Line Target. Home;. Menu. 3 can then be used to design a PCB trace to match the impedance required by the circuit. 50Ω. 5. 9. 725 c = 0. It is showing about 20db of insertion loss and the impedance is all over the place (see figures below). 031. For a pure capacitor of capacitance C Farads, the impedance ZC = 1/jωC Ohms. 4GHz this results in a via distance of maximum 3. The PCB Impedance Calculator in Altium Designer. The Trace Width is the parameter in question which should be 8. 0, inputing the parameters shown below I have got a 50 ohms result for Width = 45mils and Gap = 8 mils from RF trace to GND. For simple cases it's just applying the formula found all over the internet or use one of the online calculators PCB Impedance Calculator and Stackup Design in Altium Designer Zachariah Peterson | Created: November 9, 2020 | Updated: July 15, 2021 Table of Contents How to Calculate PCB Trace Impedance in Your Stackup PCB Impedance Calculations With IPC-2141 Formulas Wadell's Impedance Equations How Your PCB Stackup Determines Impedance Includes information on how trace width is calculated. 44, c = 0. W W is the PCB trace width, in thousands of an inch (mil); A. Trace Impedance Calculator; Length Conversion; Wire Size Conversion Calculator; Inductance Conversion; See. 25cm recommended. ϵr ϵ r = substrate dielectric. It didn't work. 35A) Cu thickness Temperature Rise (max. T T = trace thickness. 725 are fixed parameters. Engineering/Technical. 0, inputing the parameters shown below I have got a 50 ohms result for Width = 45mils and Gap = 8 mils from RF trace to GND. This calculator computes the trace width of a stripline if the maximum current, trace thickness, temperature rise, ambient temperature and length are given. Relative Permittivity, Ε r: Height of substrate, h : Trace thickness, t (input3) : Impedance, Zo. You can calculate the value of trace width suitable for PCB by using a Saturn PCB trace calculator. The way to get a 50 ohm communication way is different depending on your choice. This calculator computes the trace width of a stripline if the maximum current, trace thickness, temperature rise, ambient temperature and length are given. Printed Circuit Board Width Tool . Access Advanced Circuits' printed circuit board trace width tool. I use FR-4, so H=1. 15-21. transparent view: 2) 50 Ohms is 50 Ohms (kind of). Inputs Trace Thickness Substrate Height Trace Width Substrate Dielectric Output Impedance (Z): Ohms Overview Let’s take a look at what exactly a 50 ohm trace is, and how you should go about figuring out what trace width to route it at. Reference: R. Controlled Impedance; PrePreg Chart. 024, b = 0. Therefore, depending on the core, outer layer prepreg, and total thickness requirement, the PCB trace width will be different.