There are four different types of impedance used in characterizing differential trace impedances. Sierra Circuits’ Trace Width calculator Sierra 3-in-1 trace current calculatorThe stripline impedance calculator provided below is useful for gaining an initial estimate of trace impedance for striplines. The information below details some of the key capabilities that PCBWay can offer and. Therefore, the IPC-2141 equations are only accurate when attempting to calculate a trace width corresponding to a 50 Ohm single-ended. 7 ohms; common impedance: 19. Vacuum press in. IPC 6012 CLASS 3/ES. For the antenna conection I should calculate the width to fit 50 ohm right? I tried to calculate the impedance, but I am getting a large width for antenna track (1. You can use the following PCB impedance trace formula to calculate its circuit impedance: εr : The dielectric constant of the material;. While the manufacturer uses Si9000, the result does not match with what the other tools get. Coplanar Waveguide Calculator. surface/external edge. and anded up with: so width: 0,47mm. We get a lot of questions about trace impedance and how to calculate the right trace size to hit a specific impedance in a manufacturable PCB. copper trace on a 4-layer board with 8 mil thick dielectric and Dk = 4. L-Match Topology. Tool calculations are based on the IPC-2152. Some of its key features include:. Just as important as determining an appropriate trace width for a single-ended trace is determination of an appropriate spacing between two traces in a differential pair. Modeling approximation can be used to design the microstrip trace. Optimize power transfer with our Impedance Matching Calculator. There is some relationship with trace width and board cost in mass production. The channel width is the distance between the centers of two vias between which traces will be routed. Cite. IPC-2221 establishes standards for PCB design aspects such as schematic, material selection, thermal management, DFM, DFA, DFT, and quality assurance. Designing trace width for HDI impedance adjustments. This change in trace width leads to a change in impedance and hence causes signal reflection. A circuit trace routed on the inside layer of the PCB with two low-voltage reference planes (i. 8. Trace width. Once the routing is done check the trace width. Trace width for breaking out 100Ω differential microstrip from 0. The Microstrip Impedance Calculator is a vital tool in the design and analysis of microwave circuits. 78 mils; with the lower trace width etch factor at 1 mil the lower trace width will therefore be 6. The width of the conducting layer is important to calculate the radiation intensity since it directly affects the bandwidth of the signal waves. Just enter the given values for trace thickness, substrate heights, trace width, and substrate dielectric in the. aspect ratio = l/d = 5 10 125 1250 12,500. It is now a major exercise to evaluate the impedance using a calculator or spreadsheet. Some of its key features are; displays insertion. Traditional measurements of PCB impedance use a Smith chart . This will work with the controlled dielectric approach, where you specify the stackup, and then you adjust the width and dielectric constant to hit a trace width and impedance target. For more accurate numbers, you can use a trace impedance calculator online. The characteristic impedance depends mainly on H, W, and $epsilon_r$ in the figure above. The trace width can then be calculated by re-arranging this formula to determine the cross-sectional area that. 6k 24 24 gold badges 118 118 silver badges 183 183 bronze badges. This dialog allows you to view and (if required) modifythe formulae used to calculate Impedance and Trace Width when using impedance-controlled routing. o use this calculator, enter the parameters of the regulator . See below for the definition of these impedances. This is done initially using calculators specifically designed for this purpose. I would like to calculate the trace width of a dipole PCB antenna in order to match a 50ohm impedance. Controlling trace width within a tolerance of +/- 10% is necessary for better impedance control. The thickness of acrylic adhesive through the rigid portion of the panel shall not exceed 10% of the overall construction. The Calculator has the following tools:. 015mm. The default units for all given values, except the subtrate. Maintain consistent trace widths to ensure controlled impedance. 031. Coil Inductance Calculator. $egingroup$ @Troy Cados: Incidentally, I have a nice workflow for ATLC: 1) section my PCB RF trace, 2) take a photo through my microscope, 3) Using photoshop lasso tool, trace out the signal, ground and dielectric regions 4) fill in with correct colors, 5) calculate with ATLC. Calculate the Differential Microstrip Impedance of a transmission line based on the the distance between the strips, height of the substrate, trace thickness and dielectric constant of the substrate. Going Forward with a Trace Impedance Calculator. The trace width and spacing for a certain impedance may be obtained using impedance calculator s. With t = 0. These calculators give. The KiCad PCB Calculator is a set of utilities to help you find the values of components or other parameters of a layout. This Javascript web calculator calculates the trace width for printed circuit board conductors for a given current using formulas from IPC-2221 (formerly IPC-D-275). Our current online trace width calculator is useful for clients who need to calculate the minimum/maximum trace widths for. 5mm, T=0. ε: Dielectric constant of the PCB material. Equation 3. 4mil and the dielectric thickness to the first intermediate layer (this is a 4-layer board) is 6. 44 x A0. 41)] * ln [5. I am designing a 4 layers PCB and under the antenna trace I have a keepout, so there is no cooper on the 2 internal layers ( L2 and L3). 2. Enter the values of trace width (w), trace thickness (t), trace dielectric thickness (h), overall dielectric thickness (h1), and the dielectric constant (er). Calculate the effective dielectric constant. Calculate the Differential Microstrip Impedance of a transmission line based on the the distance between the strips, height of the substrate, trace thickness and dielectric constant of the substrate. com Blog » PCB Trace Width Calculator - March 21, 2006 […] PCB Trace Width Calculator January 31, 2006 This Javascript web calculator calculates the trace width for printed circuit boards based on a curve fit to IPC-D-275. The IPC-2141 trace Impedance calculator will help make initial design easier by allowing the user to input basic parameters and get a. Some calculators opt for Wadell's results, yet they simply state they are "based on Wheeler’s method" without providing references. It calculates the trace width as 13. 50 Ohms and then specifically sets this trace width as a qualifier. ALGEBRAIC EQUATIONS Single Track For the stripline of Figure 2 with a symmetrically centred track of zero thickness, Cohn[3] has shown that the exact value of the characteristic impedance is 4. W is the width of the trace. To use it, first select the tolerance of the resistor: 10%, 5% or equal or smaller than 2%. *As Trace Spacing from Ground Increases, Impedance Increases. Design and stackup in altium, For ex: 8 layers and impedance control of 100 ohms on layer 2 and 7 and ask your fabricator to suggest a stackup for same 8 layers and trace impedance of 100 ohms for layer 2 and 7 and compare the values. 2, the resulting trace width required for 50 Ohm impedance would be 15. Next, determine the trace height/length. The trace geometry and material affect the controlled impedance of the trace. What is Microstrip Impedance? As you adjust the width of the line, you can eventually get the microstrip impedance calculator to converge on the desired impedance value, and you have finished designing the microstrip trace. Verify Against Other Design Rules. 63mils via height. In order to get 100 Ohms differential, the line width must be. Stripline Impedance. 7 x 10-6 ohm-cm αcopper. 5 mil (0. Impedance control with BGA escape routing in HDI PCBs H eff = H 1 + H 2 2 H e f f = H 1 + H 2 2. Z0,air Z 0, a i r = characteristic impedance of air. JLCPCB Impedance Calculator. Spacing with copper weightSierra Circuits’ Via Impedance Calculator uses the physical dimensions of a via to calculate its capacitance, inductance, and impedance. Trace Impedance Calculator; Length Conversion; Wire Size Conversion Calculator; Inductance Conversion; See. Trace Width (W) Figure 3. 41)] * ln[5. RF Wireless World. If you reduce this trace width to 19 mils, the characteristic impedance will result in about 52. You can use our trace width calculator to design the right traces for your boards. Let's calculate the trace thickness and trace spacing- Som with a 15% tolerance and 90 Ohms targeted impedance, the conductor width required 0. Click on Setup -> Constraints > Electrical Constraints Set - > Differential Pair Value - > Calculator > If you put 10 in the Line Width, the calculator calculates the single ended as well as differential impedance. Summary. Dielectric material: This is the prepreg and core materials utilized on each side of the controlled impedance trace layer. 3 is a plot of impedance versus trace width for the three most common types of transmission lines in PCBs-- surface microstrip (SMS), buried microstrip (BMS) and centered stripline (CSL). To get a 50 Ohm characteristic impedance, you just have to define your trace width in the proper proportion to the H of your. Polar or rectangular grids only allow direct reading of S11. There are many other free calculators available. to select appropriate isolation materials, layer thickness, trace width, distance between traces,. Impedance Calculation. You can use our trace width calculator to design the right traces for your boards. 8 * W + T)]) ohms. The designer can normally enter their desired impedance, and the calculator will determine the PCB trace width needed to meet that impedance goal. Discontinuities cause signal reflections due to impedance mismatch compromising signal integrity. Before, working with a trace impedance calculator, one should be aware of which equations the calculation uses. If the Length, l, to diameter, d, ratio is known, you can calculate the Inductance, L, series resistance, Rs and the aspect ratio l/d is related to Q = L/Rs for a given conductor material. Vias (plated holes) are used to route electrical signals among different layers of a multilayer. *As Trace Width Increases, Trace Impedance Decreases (Thickness has Min Effect). The Smith Chart graphically maps S11=reflection coefficient= (ZL-Z0)/ (ZL+Z0) to Load Impedance (ZL), normalized to Z0 (source impedance = center of chart). ( 0. 99:. 25mm trace. They include conductor spacing, creepage, and insulation requirements. These fields are generated by the interaction between electric and magnetic field lines. Trace width/SpacingMin. I will see if I can come up with something for vias similar to my Transmission Line. For controlled impedance, if the built in trace width calculator calculates that the traces need to be incredibly thin, the you need to change something else in the design, like the dielectric material or the dielectric thickness. Our Impedance Calculator uses a 2D field solver to calculate near-end crosstalk based on the following equation: NEXT = V b /V a = ¼ (C mL / C L + L mL / L L). Thickness: Thickness of the stripline conductor. The edge couple differential microstrip transmission line is a common technique for routing differential traces. The trace width can then be adjusted. Dual Stripline. 2mm0. You can find trace impedance calculators online or in your CAD software. Controlling the impedance in your design is dependent on the board layer stackup you. The IPC-2221 standard and IPC-2152 standard both include this guidance on designing for thermal reliability, and there has been some debate as to the applicability of each standard. This calculator helps translating the color bars from the resistor to its value. Use our online tool to calculate the minimum trace width for a given current and copper weight. 8W + T)] Where: Z: Characteristic impedance of the microstrip trace. It is not uncommon that the calculated trace width will be a value that cannot be ordered, for. In this calculator, we will show you how to calculate the trace width of a PCB for both internal and external traces. Sierra Circuits’ Trace Width, Current Capacity and Temperature Rise Calculator is an advanced PCB tool that works based on the latest IPC-2152 standard. This Javascript web calculator calculates the resistance, voltage drop, and power loss of printed circuit board vias. 6. Calculates the characteristic impedance and per-unit-length parameters of typical printed circuit board trace geometries. This is more than the to times trace width which is recommended (also read as close as possibly). 725. This calculator requires symmetry in the trace widths and location between plane layers. It supports both balanced and unbalanced lines. Enter the same substrate parameters and 14 mil for W. This tool will also provide the signal propagation delay, capacitance, and inductance per unit length. With a standard 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),. 7 pages of equations to evaluate the impedance. A trace width calculator is a tool used to calculate the width of a trace on a printed circuit board (PCB). Can PCB traces be too wide? Yes, PCB traces can be too wide, which may lead to inefficient use of board space and increased manufacturing costs. Loop Inductance Calculator. A PCB. A calculator designed to calculate the trace width of a stripline based on the maximum current rating Embedded Microstrip Impedance Calculator This calculator helps you compute the characteristic impedance of an embedded. 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. The PCB internal/external trace resistance shall be calculated according to the following formula: R = (ρ * L / (T * W)) * (1 + α * (TAMB – 25 °C)) Where: R is the trace resistance [Ω] ρ is the resistivity parameter, whose value for copper is 1. 5 oz. Yes, copper poor around your differential stripline will substantially affect the characteristic impedance. Abrupt changes in trace width cause impedance discontinuities. The KiCad PCB Calculator is a set of utilities to help you find the values of components or other parameters of a layout. 1. In this article Impedance matched. Deliver -/+ 5% impedance tolerance. Uncoated microstrip single-ended impedance calculator. Best is 5mils, but 4mils is OK, too. All transmission lines are 1 ounce thick (1. An embedded microstrip can be constructed using a microstrip with a solder mask. This calculator finds both odd and even transmission line impedance. To calculate one of these quantities, the other two must be known. What is the width of a trace for 100 ohm impedance? The width of a trace for a 100-ohm impedance depends on the PCB material and other factors. It is possible to select other units. 4mm PCB for a trace width of 0. The following formula is used to calculate the differential impedance of a microstrip: To calculate the differential impedance of a microstrip, divide the characteristic impedance of the microstrip by 2. At times, you need to lower the copper weight to achieve a specific impedance. Round up to nearest 5 mils. For differential pairs, a coupled microstrip line can work also. 0 High-speed data lines. 1 ohms; In addition to those calculation I found some other resources with some sample trace properties: Mikrocontroller. Microstrip. For example the width of the trace(W) is 6 mils and the distance between the differential pair(A) is 8 mils. Microstrip Impedance Calculator. 2. The trace impedance (Z) of a PCB trace can be calculated using the formula for microstrip transmission lines: Z = (87 * Log10 [ (2 * H) / (0. The impedance calculations will take into account their thickness and dielectric constant. A stripline is similar to the microstrip except that the flat conductor is now. Dielectric thickness vs. Impedance Calculation. Use the max current (Imax) and max current density (J) to determine minimum trace width: Trace Width (mils) = Imax (A) / J (mA/mil2) Add margin of 20% for reliability. **Note: Like our stripline impedance calculator, all of our RF calculators allow SI prefix input. 5mil clearance on a 63 mil board (1. T-Match Topology. The dielectric thickness, Dk, trace width, copper weight, and any special parameters are all taken into account when calculating impedance. 5mil0. Using this calculator, I found 100 Ohms by giving 9 mils of track width, 5 mils of track separation, 8 mils of dielectric. Via pad diameter (in mils) Trace/space width (in mils): This is the width of the trace and the space between them. o use this calculator, enter the parameters of the regulator . Step 1 Calculate singled ended impedance for each: Use "impedance + trace space" from top drop down box: Set Z=50R, click single ened, gives a result of. β2 = 0. . To manufacture controlled impedance printed circuit boards, one must be able to measure impedance. After changing W to 14 mil click “Analyze” and you can see Zo is now calculated to be 49 ohms. Trace Thickness (T) 2. Asymmetric Stripline. This should be provided along with the PCB material. T is the trace thickness [oz/ft 2], W is the trace width [mils], R is the resistance [Ω], ρ is the resistivity parameter, whose value for copper is 1. In this demonstration, we’ll choose uncoated microstrip single-ended impedance calculator. Things I noticed in any RF IC. Share. 378t} W = 1. The tool implements numerical solutions of Maxwell’s equations to render accurate and consistent results. Convert psi to bar, kgf/cm2 to psi, bar to kgf/cm2, and other units like pa, mmH2O, inches H2O, psf and atmosphere with the pressure measurement conversion calculator. The IPC-2221 standard and IPC-2152 standard both include this guidance on designing for thermal reliability, and there has been some debate as to the applicability of each standard. Published by John Coonrod, Technical Marketing Manager on Oct 13, 2020. Color Code. This tool includes an industry-standard field solver that is built into your PCB layer stackup. T. I've used 7 mil trace width with 5 mil spacing, top and bottom layers (35um copper) are 0. e. Via impedance Via step response Via DC resistance Via impedance Via resonant frequency Via thermal resistance Via voltage drop Via power dissipation in dBm. There are a few points to note about this. When I was 12 years old, I opened a television for the first time, and that was when my passion for electronics started. In the first section of the PCB DFM tool, you need to key in the part number (name of the design), revision (edition of the design), number of layers on the board and board dimensions. 5oz. Coplanar Waveguide With Ground Characteristic Impedance Calculator. H 2 H 2 = subtrate height 2. It gave me a trace width of 6. 024 x dT0. This calculator requires symmetry in the trace widths and location between plane layers. Differential Impedance Ω. 378tA. By plotting the above equation for common temperature values, we can obtain the following chart. Maintain consistent trace widths to ensure controlled impedance. PI Network Impedance Matching. 9E-3 [1/°C], T TEMP is the trace temperature [°C]Calculate the required trace width for a specified current using the PCB Trace Width calculator. To use this tool, enter the values for trace thickness, substrate height, trace width, trace spacing, and dielectric constant in the calculator above and press the "calculate" button. To help you achieve this feat, Sierra Circuits has introduced the Bandwidth, Rise Time and Critical Length Calculator. This calculator is designed to compute the maximum allowable current that can flow through a stripline. However, when using EEWeb's impedance calculator, I get much different values. Where: Z0 Z 0 = characteristic impedance of the asymmetric stripline in ohms (Ω). The velocity factor is simply: 1 / sqrt (e_r*mu_r). Typ e, V ref and, if needed, I a d j , select the field you want to calculate (one of the resistors or the output voltage) and enter the other two values. These are primarily the result of changes in the effective trace width or in the line-to-line spacing caused either by unavoidable transitions in theThe way to calculate the inductance is to first calculate impedance, and then use the impedance to calculate the trace inductance. Controlled differential impedance starts with characteristic impedance. Calculations are made using the formula below: Where: Enter the frequency and inductance into the calculator, choose the. The minimum. The aim of the Impedance Calculator is to support the. At the point of bending, the trace width is 1. The JLCPCB Impedance Calculator computes track width values and recommended stack-ups from user-input values of board layer, thickness, copper weight, target impedance, trace spacing (for edge-coupled pairs), and impedance trace to copper gap (coplanar waveguides). A PCB impedance calculator uses field solvers to accurately approximate impedance values. For a rough estimate, it might be in the range of 10 to 20 mils (0. 254mm, spacing between both is required 0. A coplanar waveguide with groundplane distance H = 1. 98mil. For example, row ‘a’ above shows details of layer 1 (100 ohms) on a differential pair with a trace width of 4. 17mm in order to achieve this 45 ohms. PCB Trace Width Calculator. ] Internal Layer Results: Copper Area: External Layer Results: [Mils] [Square Mils] [Volts] Trace Width Calculator Results: Via Current. Cite. So, the dielectric at my 5-6GHz frequency range is 3. 6mm) That should give the traces around 90 Ohms differential impedance according to the PDF, but when I try to input it to my impedance calculator (Saturn PCB toolkit V7. So Adjust trace width to match the impedance to 50 Ω Ω. TransLine. What are the limits of the trace width calculator? The formulas used in the calculator are based off IPC-2221 (formerly IPC-D-275), which covers up to 35 Amps, trace widths up. 3mm of the microcontroller), therefore i rounded the width to 0. 54cm trace at the non-inverting input of a high-speed op-amp will result in 29nH stray inductance. Electromagnetic fields are part of the spectrum ranging from static magnetic fields to high-intensity gamma rays. The JLCPCB Impedance Calculator computes track width values and recommended stack-ups from user-input values of board thickness, copper weight, layer,. The edge couple differential symmetric stripline transmission line is a common technique for routing differential traces. Select a Configuration. Input your data. 4 mm, trace spacing S = 0. Explanations of signal integrity issues. W is the width of the trace. 7E-6 [Ω · cm] L is the trace length [cm] T is the trace thickness [cm] W is the trace width. 1< W/H < 3. t. Microstrip Trace Impedance Calculator The calculator utilizes the formula for calculating the impedance of a microstrip trace: Impedance (Z) = [87 / √(ε + 1. There are many tools available to calculate the trace impedance on high speed traces. W=trace width. The guides says spacing under 0. Trace impedance is dependent on not only. Sierra Circuits’ Via Thermal Resistance Calculator is an advanced PCB design tool that expedites the process of designing thermal vias. Inputs: Optional Inputs: Results for Internal Layers: Results for External Layers in Air: Notes: The trace width is calculated as follows: First, the Area is calculated: See full list on protoexpress. The impedance depends on the net width, the net height, the board type and so one. If you need to mass produce PCB's at low cost, the minimum trace width should not be pushed too hard. Trace Impedance Calculator. via stitching to GND plane. 725. Pasternack PCB Microstrip Calculator is an online calculation tool that lets you compute a microstrip's height/width ratio, impedance and relative dielectric constant for a microstrip transmission line. So just set the trace width constraint in your PCB router to 13 mils, and your routes will all be precisely 50 Ohms. 3mm, as shown below: This increases the impedance slightly to 91. 6 ohms. We will assume here that both of the lines of the pair are identical and uniform. Features: Three-in-one calculator. PCB Via Calculator March 12, 2006. Keep in mind that the reactance of the ideal inductor has the same magnitude as its impedance. 1 to 2. 1. Then, using a standard PCB trace impedance calculator or using the formulas in a textbook, you’ll find that the required trace width is 13 mils. It is a full-featured Excel-based tool that helps plan the PCB stack-up so that controlled impedance traces can be effectively implemented. Enter the relative permitivity, width of the trace, the ground plane spacing, and the substrate thickness to calculate the characteristic impedance. Using the EEWeb Microscrip Impedance Calculator, I find that with 1oz/ft^2 copper and a substrate height of 0. Includes information on how trace width is calculated. 49mil trace width. Another advantage of assigning the impedance property is that allegro automatically assigns the width of the track based upon the assigned impedance value. You can build your own board layer stack or you can choose to work with one. of typical printed circuit board trace geometries. 4 mil trace thickness. 25 mils , t = 1. We recommend the software from Polar Instruments if you want to get exact impedance calculation. Impedance quality = Q = L/Rs 2. ( 0. Note: The results are only for approximation and rough estimation, the. Figure 3 is the plot of impedance versus trace width for the three most common types of transmission lines in PCBs—surface microstrip (SMS); buried microstrip (BMS) and centered stripline (CSL). The impedance of a trace is calculated based on the placement of plane and signal layers in the PCB stackup. These are precisely the characteristics of a pair of lines to be designated as a differential pair. differential trace impedance for USB (90 Ohms) on 2-layer FR4 board. IPC 2141 Trace Impedance Calculator. You can also calculate the accurate drill diameter, via to via spacing, and the thermal vias that. It includes calculations for trace width, impedance, current-carrying. Calculate the pcb trace impedance of. 72mil. 2. Measuring the trace width we get a width of 5mm. 5; results odd impedance: 45. With the RF Attenuator utility you can calculate the values of the resistors needed for different types of Color-Code. 25 mils, Impedance = 50 Ohm. Also for differential LVDS signals the tool can calculate the trace width and spacing for 100 ohm impedance for a given stack up setting. Disclaimer: Our trace width calculator tool is exclusively designed to evaluate optimum trace width, maximum trace current, and temperature rise above the ambient required for a feasible PCB design. Calculate Minimum Trace Width. The PCB design tools in Allegro include an impedance calculator that will help you size your traces so that they have defined characteristic impedance. This tool will also compute the resistance of the microstrip, the voltage drop, and the power. Geometric Parameter Definitions: W: trace width: T: trace thickness: H (/H1) height of trace or dielectric above return plane: C: distance between the differential stripline pair: er. That brings us to the Omni RF unit converter, a tool that will let you convert from and between any of the standard RF units. Pick a signal frequency for your taper. 5 nH, which is consistent with typical trace inductance values. The application will often drive the trace widths and types in a PCB design and at a certain point, there is. To calculate the proper trace width for routing, PCB layout designers must add these parameters to the circuit's impedance. Factors Affecting Coplanar Waveguide Impedance When calculating coplanar waveguide impedance, there are many factors that affect the waveguide’s impedance, losses, and. 7E-6 to 2. What is the width of a trace for 100 ohm impedance? The width of a PCB trace for a specific impedance depends on factors like dielectric material and thickness. The trace width required to deliver a specific impedance can be calculated as part of an impedance profile, in the Impedance tab of the Layer Stack. Obviously, there is no ground on the bottom side. H: Height. The default units for all given values, except the subtrate dielectric, is in millimetres. To use these to design for a target impedance, simply cycle through various geometric values for the trace width until the calculator returns the target impedance. Adequate trace width is necessary to ensure the desired amount of current can be transported without overheating and damaging your board. If impedance control is necessary, determine the trace width required to reach your impedance target. Equations Internal traces : I = 0. when i use Saturn PCB design to match the differential impedance to 100ohms i get 0. 5 mm, trace width W = 0. These calculators will return an impedance value for pairs of trace width, substrate thickness, and copper weight values. For example, if you wish to input "25000000", just type "25M" instead. per sq. 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. Trans Line. Where: H is the height of the PCB above the ground plane. 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. Just as important as determining an appropriate trace width for a single-ended trace is determination of an appropriate spacing between two traces in a differential pair. 17mm in order to achieve this. Stripline. Stripline Impedance. 3-in-1 calculator: temperature rise above ambient, trace width, and maximum trace current capacity; Evaluates trace resistance, voltage drop, and power loss; PCB dielectric requirement. To use this tool, enter the trace width, thickness, ambient temperature, temperature rise, and the microstrip length and click the "calculate" button. 5 mils and spacing of 4. 3W spacing between critical traces 3.