eu. This decision is based on the type of stack-up used in the PCB design. 2 that should make the impedance greater, not smaller, and only by a couple ohms. Using the built-in Simbeor ® impedance calculator, the PCB editor's Layer Stack Manager calculates the trace width needed to deliver the specified impedance. The best PCB stackup design tools will account for dispersion in your board laminate material and will include it in impedance calculations. RLC Resonant Frequency and Impedance Calculator Bandwidth, Rise Time and Critical Length Calculator Transmission Line Reflection Calculator. Dimension:There are many calculators available online, as well as built into your PCB design software. Controlled Impedance: 4/6 layer, default layer stack-up: Controlled Impedance PCB Layer Stackup JLCPCB Impedance Calculator: Material: FR-4: FR-4 Standard Tg 130-140/ Tg 155: Dielectric constant: 4. 0+N+0. While this calculator will provide a baseline, any final design considerations should be made towards loss, dispersion. Atlas Si for Touchstone – PCB Insertion loss processing with Delta-L 4. For an embedded (internal) microstrip, the formulas provided in paragraph 4. My problem is to calculate overall impedance (independent of layer stackup topologies). 035mm Prepreg 7628*1 0. Using a power plane as signal reference. Field solvers. If you require a controlled impedance PCB, you should discuss this with your PCB fabricator. An ideal 6-layer. The grid of layers is divided into 2 regions, the layers in the stackup are displayed on the left, then for each signal layer in the stackup there is a layer. For your convenience, we have designed an Impedance Calculator to help you calculate the impedance and the trace width you require. Altium Designer's Layer Stack Manager includes an integrated. For example, if you are using 1 oz of copper for a 1 sq ft area, the thickness of copper is 1 oz. png . This will leave the rest of the signals which are rather non-critical like I2C, power good signals, etc. Allegro PCB Designer. It also has an integrated impedance calculator to get the desired impedance and trace/space values on any signal layer. It is the ratio of voltage and current amplitudes of a single wave propagating along the line in the absence of reflections from other directions. Developing an efficient stackup is a complicated process championed by innovative companies such as Candor, a leading PCB manufacturer. Laser drilling creates precise holes on a PCB to establish connections between different layers. 3 V, you will usually be fine if you use adjacent plane layers and a few decoupling/bypass capacitors on critical components. This note provides a brief look at how stackups have progressed from the single sided PCB to HDI builds with their multiple layers and multiple passes through the production process. On a multilayer PCB this only works when the signal is also on an inner layer-- making it difficult to have the proper impedance AND capacitance on an outer layer. Note: The results are only for approximation and rough estimation, the final values and the. Ask Question Asked 2 years, 4 months ago. The tool also calculates signal losses of any given trace. It’s library of PCB laminate material reduces material costs without sacrificing performance. 6 layer stack-up with power ground and signal layers. Track width (w) = 137 micron. Differential Pair Impedance Calculator Speedstack PCB stackup design tool is a packaged combination of the Si8000m field solving impedance calculator and the Speedstack professional layer PCB stackup design system. 25. for example, with a layer-height of 0. The relationship between these tools usually goes further than that though with this data also being made available to other portions of the system to configure design rules. Using. 7 10^ (-6) Ohm-cm. Based on my understanding of a 4-layer stack-up, one of the best set-up I chose is 8 mil trace space and 10 mil trace thickness. The standard tolerance for controlled impedance is ±10%. A pair of lines can be modeled as follows: Differential pair line. The characteristic impedance of both traces should be the same to maintain balanced signaling. Main features of this Stackup Designer tool:The stripline impedance calculator provided below is useful for gaining an initial estimate of trace impedance for striplines. ft. An example of rigid-flex PCB stack-up. ALTIUM DESIGNER. To achieve that, every designer should know the major cost drivers of a circuit board. Stripline routing has a big advantage in being sandwiched between two ground planes. Planning the multilayer PCB stackup configuration is one of the most important aspects in achieving the best possible performance of a product. Rule #1 - Number of layers in stackup. MAN 199–2002I want to learn something about desiging a custom PCB stackup. In high-density interconnect PCBs, maintaining a. This configuration allows for narrower traces to be used for the same. It is well worth taking a few minutes to review your notes versus your stack-up and be sure to resolve any mismatches you find. To update trace width, select the traces of interest and use the "Route > Retrace Selected" command. It is composed of two conductors: a signal trace and a return path which is usually a ground plane. Calculating PCB Stackup. Controlled Impedance routing is all about configuring the dimensions of the routes and the properties of the board materials to deliver a specific impedance. This tool allows you to create, edit, and simulate your PCB design, and provides. ] JLCPCB StackupsTechnically, there is no proper limit to N, though it depends on the layer count and the outer layer thickness. As a rule of thumb, a four layer board will produce 15 dB less radiation than a Double side PCB board. PCB Trace Width Calculator; PCB Shelf Life; Capabilities PCB Capabilities PCB Assembly Service Quick turn PCB Fabrication. PCB stackup calculator and Si8000m controlled impedance field solver - professional PCB stack up design and documentation. Our Impedance Calculator is based on 2D numerical solutions of Maxwell’s equations for PCB transmission lines. Dimension:If you require a controlled impedance PCB, you should discuss this with your PCB fabricator. 0. An impedance calculator is integrated within this tool which you can use to compute the necessary impedance, trace width, and spacing values for any signal layer. Complex PCB requirements; Mil-Spec & Class 3 with HDI Features; Blind &. 1 Defining cores and prepregs 2. At high frequencies, PCB signal traces. It is called ‘turnkey’ as PCBA. 6mm (4L-01) When using our free Defined layer buildup 4L-01, you will reach the desired impedances e. Just as an example, we can look at a simple PCB stackup with impedance control to see the microstrip inductance. This stack-up is constructed using a single lamination. A PCB impedance calculator is an essential tool for designing stackup structures during the planning stage of layout design. Measuring ultra-low impedances (20 micro-ohms) is a challenge for any power distribution network (PDN) design engineer. Saturn PCB - Toolkit for Impedance Calculation. They're very popular in the hobbyist community due to their low cost and reliable quality. Speedstack PCB stackup design tool is a packaged combination of the Si8000m field solving impedance calculator and the Speedstack professional layer PCB stackup design system. To mitigate these factors, first determine the loss budget for your targeted protocol. as i think it can do. Use impedance calculation tools for specific dimensional values based on your design requirements. Arranging stack-up in KiCad. PCB Stackup or Buildup – a brief history. I am planning to have the PCB (4 layer) manufactured at JLPCB controlled impedance service. Their hardware design guideline said the traces between the USB and the termination resistors should have a differential impedance of 90 ohms. Here is the 6 Layer stack up I would prefer. The PCB layer stack-up calculator is a powerful tool for modern electronics design. Depending on the requirements you can generate a stack-up. Step-by-step process of sequential lamination 4-layer PCB stack-up. The DRC system can help you avoid some design. The ‘ripple%’ points to the maximum voltage deviation. Checking Impedance in Your PCB Layout. Voltages above these levels are considered hazardous, and that is why these designs are regarded as high voltage. Loss planning, including copper roughness — Layer by layer calculation of loss as a function of geometry, Df, copper roughness on both sides and frequency. It also allows you to configure drill pairs and impedance formula editor. PCB. Generally, soldermask will. It enables engineers and designers to understand and control the intricate aspects of PCB layout. 0 HUB. Vias (plated holes) are used to route electrical signals among different layers of a multilayer layer PCB. This new release builds on the familiar ease of use of the popular In-Circuit Design online Impedance Calculator that has been utilized by tens of thousands of Engineers and PCB Designers world wide since 1996. Going to route the following signals: 100R differential pair (Zo = 50R) 90R differential pair (Zo = 45R) Planning to use the stack up JLC7628, with a 4 layer PCB, in total 1. Microstrip Impedance Calculator. Selecting and routing on prepreg vs. • Ground planes must not be broken in the GND reference layer immediately beneath he transmission line. There are some advantages to using a microstrip transmission line over other alternatives. ) Hide We may add extra cost for these special options which will be confirmed after review. Note: The trace on the inner layer need to be much wider than the trace on the outer. It covers both single-ended and differential traces and is based. It allows both impedance calculation and layer stackup/build up documentation. g. Sierra Circuits is a minority-owned business, certified by the National Minority Supplier Development Council. For differential pairs, there is also a spacing value given. 3. 1. Stack-up assistance included. A PCB impedance calculation generally refers to the task of calculating trace impedance, or transmission line impedance, based on the stackup and material configuration used in your design. Best schematic design practices. , DDR, HDMI, Gigabit Ethernet). Modify the variables to examine the effects on the trace characteristic impedance. N avigation T ree: Technology > Impedance Calculator. . Consider the following points to limit the flexible PCB errors in the bend areas: Avoid 90-degree bends. In a 4-Layer PCB board, You have to insert the parameters, depending upon the capabilities of the manufacturer of your liking; Thickness of the PCB (Combining all the layers) – Can be from 0. Above image illustrates all traces on this large PCB are the same size. Talk to a Sierra Circuits PCB Expert today. Let us explore the different file types and the methods to generate PCB assembly files. The Sierra Circuits High-Speed Design Guide helps you design PCBs with signal frequencies from 50MHz to as high as 3GHz and beyond. 6mm thick) This has been updated October of 2020. The dielectric constant of your substrate will affect the geometry required to produce a transmission line with specific impedance and will affect the impedance of. 2104mm inner Layer Core> inner Layer The Impedance Calculator evaluates single-ended and differential impedance for various impedance models. 5. Contents. 3. 1. The JLCPCB Impedance Calculator computes track width values and recommended stack-ups from user-input values of board thickness, copper weight, layer,. Polar Instruments Ltd. Adding these along the board’s surface creates a robust vertical connection through the structure. 7mil) / Track Gap 8 mil / Dielectric thickness 2x 0. A schematic shows the components that are used in the design and how they are connected together. In air gap construction, the flex layers are kept as several independent sets of no more than three layers per set. Use a field solver that can account for dispersion and copper roughness. A lower layer count may increase board size, routing complexity, and the inability to create high-density circuitry. Using the goal seeking facilities of the field solver to obtain the correct impedance for a structure. Atlas DRG v18. mm. Impedance control is a critical consideration when designing and manufacturing printed circuit boards (PCBs) used in high speed or high frequency applications. 6-layer rigid-flex stack-up: 6 layers with 3rd and 4th layers as flex. Freedom of design. A fully unified, heavily rules-driven PCB design platform for impedance controlled routing in high-speed PCB design. An impedance table should also be included in the fab drawing. The Impedance Calculator evaluates single-ended and differential impedance for various impedance models. 0175mm of Copper (1/2 oz), gives me a best estimate of 9mil trace, 4mil space for a 90R differential microstrip impedance. Achieving a critically damped state in the transmission line is crucial to achieving the fastest settling time without overshoot or oscillation. Calculating Impedance in PCB Stackups. Repeat #1 for differential impedance. PCB Substrate Material Selection and Stackup Design Due to the parasitic effects mentioned earlier, you will need to carefully select a substrate material and design your stackup. Reference layer. Formulas from IPC-2141A Design Guide for High-Speed Controlled Impedance Circuit Board. Hot Network Questions Fixing wrong ideas about coefficients (e. The image below shows a typical 4-layer PCB stackup construction you’ll receive from most fabricators. Every board designer would require supporting PCB design tools to simplify the design process. Sierra Circuits’ Via Impedance Calculator uses the physical dimensions of a via to calculate its capacitance, inductance, and impedance. Speedstack PCB includes Si8000m. PCB Stack-Up Altium Designer’s impedance calculator takes your board layer stackup information and sends the trace width and thickness results to your design rules. The sleek gadgets that we all are acquainted with consist of HDI boards that incorporate laser drills. By understanding the microstrip transmission line, designers can. The tool used 0. core materials is easiest when you use PCB design software with an integrated stackup and impedance calculator tool. The PCB stackup is the substrate upon which all design components are assembled. 1 Prepregs 2. The impedance of a trace is calculated based on the placement of plane and signal layers in the PCB stackup. Z-planner Enterprise is a stackup planning tool that includes a PCB stackup calculator focused on electrical impedance and signal integrity that helps you manage and optimize your PCB stackup design. Stack-up is an arrangement of board materials in sequential order. In the rule shown above, the preferred width and min width have been set to the value defined in the impedance profile. Traces and their stack-up are presented in Figure 7. 7 design rules to reduce crosstalk in your PCB designs. PCB stackup design will determine the trace geometry required for controlled impedance, but the impedance calculation needs to consider the entire. 2mm, copper thickness from 18μm to 210μm (0. This dense board with high-speed components will need a multilayer PCB stackup. This integrated pcb stackup calculator streamlines impedance optimization for high-speed designs. Fortunately, the return path analysis tools in PCB layout CAD systems can easily find and report these problems to the designer. 2116 Prepreg 4. They've got full stackup info and an impedance calculator on their site. The preferred equation used for calculating impedance is repeated here in Equation 1. I'hv already checked on Saturn PCB Design tool. Before starting the layout design, it is necessary to have a stackup design and to set up the layout. The Simbeor impedance calculator calculates the width(s) required to achieve the specified impedance. It should include impedance value, trace width, differential pair spacing, and the layer on which the controlled impedance traces are routed. PCB. Single ended. AS9100D – Military & Aerospace. In The News. It is widely accepted that the most accurate impedance calculations are produced with a 3D field solver due to the complex geometry in any PCB layout. PCB Laminates & Materials Impedance calculators: Using the data created by the layer stackup generator, the impedance calculator will give you the correct width for your controlled impedance lines. Select the number of substrate layers. 5 mil (0. Gerbers provide information about each and. 2 Foreword the theoretical, but also the practical elements. 2. 002” to 0. And that they have the same separation from each other along the entire length of the line. (Sorry guys, I live and I have grown up in a metric world ) With these values, Saturn PCB's off-line calculator gives 57 Ohm differential impedance. These files are generated for each and every layer in the stack-up. IPC 2141 Trace Impedance Calculator. 293, 50% of the copper removal can be achieved. The layer stackup also affects cross-talk and net impedance; and these two factors, in turn, drive the functional performance of a PCB. 1. It is challenging to identify the ideal material to facilitate high-speed and HDI applications. By understanding the microstrip transmission line, designers can. Controlled impedance is the characteristic impedance of a transmission line formed by PCB traces and its associated reference planes. The microstrip is a very simple yet useful way to create a transmission line with a PCB. The common ones are: single-ended characteristic impedance = 45/50/55/60 ohms, differential characteristic impedance = 85 /90/100 ohms. The tool implements numerical solutions of Maxwell’s equations to render accurate and consistent results. First, we would like to know the critical length for a USB signal being routed on a typical 2-layer PCB. What makes it distinct are parameters like impedance matching, type of traces (preferably co-planar), elimination of via stubs (to avoid reflection), ground planes, vias, and power supply decoupling. controlled impedance structures to the stackup model. DFM for flex and rigid-flex PCBs with SMT involves selecting application-specific circuit construction types, laminates, coating thickness, trace routing strategies, bending, and EMI capabilities. After selecting the relevant impedance model, you’ll have to key in the input parameters. Less material and manufacturing procedures enable simpler, cheaper PCB designs. 8mil) / material FR-4. For the assembly process, manufacturing data is also required. 2mm, copper thickness from 18μm to 210μm (0. If a signal encounters impedance discontinuity, it will generate jitters in PCBs and hampers the signal integrity. HDI PCB stackup with staggered microviasSignal Integrity (SI) in High-Speed PCB Designs. ALTIUM DESIGNER. Distance between tracks (s) = 254 micron. Cross-hatched copper plane in a flex stack-up for controlled impedance. High speed measurement tools. The iCD Stackup Planner features a precision 2D Boundary Element Method (BEM) Field Solver providing customers with the accuracy and simulation speed they need for high-speed PCB Design. The Altium Stackup Manager not only allows you to define the stackup, but you can also create impedance profiles for various SE and DIFF impedances. • Choose a suitable board stack-up that supports 75 Ωsingle-ended trace and 100 Ωcoupled differential characteristic impedance trace routing. 24 hours a day, 7 days a week. Used by PCB manufacturers to refer to selection of dielectrics and thicknesses to hit a trace width/spacing specification, or modification of trace geometry, to hit an impedance target. Figure 2. The design engineer must take charge of the design to mitigate the above issues. The original stack-up given by a customerUnderstanding PCB Stackup and Materials. Controlling the impedance in your design is dependent on the board layer stackup you choose. Email us: through our Customer Care form. PCB stack-up design. We will show you how our Stackup Designer, Impedance Calculator, and Material Selector work. The required inputs are the Dk value for the dielectric constant of the PCB substrate, and the. Soldermask – Affects on Impedance Since PCB’s are normally covered in Soldermask then the affects of the conformal coating should be considered when calculating impedance. Use impedance calculation tools for specific dimensional values based on your design requirements. Changing the stack-up will affect the calculated trace width for impedance-controlled traces; however it will not automatically update existing traces. Hybrid PCB stack-up: Stack-up made up of Rogers 4350 and Isola 370HR material for high-frequency circuits. 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. Assuming both. According to the Altium Designer, stack-up tool’s impedance calculator, the impedance of trace 3 is 50Ω. A typical value of 1/7 Lambda has been set by default. Place SMT. It is possible to minimize the dependency on discrete decoupling/bypass capacitors by taking advantage of the inherent capacitance in a stack up. Speedstack Si – Insertion loss & impedance PCB stackup design including Si9000e. HDI also results in a lesser number of PCB layers. This paper presents a flexible and efficient methodology to optimize stack-up for multi-layer printed circuit boards (PCBs) with enormous search space and various design constraints. 0521164. First, select the desired RLC connection (parallel/series). But in general do these things: Use a Sig/Gnd////Gnd/Sig stackup for more consistent impedance at top and bottom. The build-up provides the following information: The copper thickness and weight. By leveraging mathematical precision and providing ease of use, it adds tremendous value to the field, facilitating innovative and efficient designs. More reliability: The improved signal integrity and power distribution make the 8-layer PCB more reliable than its lower-layer counterpart. 5oz to 2oz), and minimal spacing between layers to 3mil. Historically, the primary electrical requirements have been a controlled impedance in the signal layers and enough copper in the plane layers to deliver DC power to the circuits mounted on the PCB. High-density interconnects (HDI) PCBs are the boards with a higher. 4mm to 3. Vias (plated holes) are used to route electrical signals among different layers of a multilayer. TOP - SIGNAL L2. s4p files with Delta-L 4. Board thickness (h) = 50 micron. AS9100D – Military & Aerospace; IPC-A-600 Inspectors. IPC-2152 is the standard for determining the current capacity, temperature rise, and width of a trace in a printed circuit board. There are many factors that go into calculating the width of an impedance controlled trace. Learn more about the integrated field solver from Simberian in Altium Designer. To summarise, in order to get the optimal HDI PCB cost, one has to consider several factors such as yield, material type, via drilling methods, and imaging. 5 oz) and 1. Si9000e – PCB insertion loss field solver. Speedstack PCB Stackup Design and Documentation . The characteristic impedance is given by: Eq. Layout engineers will design the layout based on the stack-up design, including settings such as line width, line spacing, and differential routing. Select the number of substrate layers. 1. ; The laminate should be CAF-resistant and RoHS-compliant to prevent corrosion from hazardous chemicals like lead, mercury, and cadmium. HDI boards and key considerations 8 layer HDI PCB. Thank you. 1 of the Microstrip Calculator using H2 in place of h, εr,eff can be computed as specified in Eq. Garenne Park St. width|space|width. Procedure to use the calculator: 1. they normally use 7. Impedance examples 4 layers 1. JLCPCB Impedance Calculator. You have this backwards, the common rule is to use impedance control when the electrical length of the trace is more than 1/10 of a wavelength at the frequency of interest. PCB designers typically need to implement impedance control for PCBs used in high-speed digital applications, such as RF communications, telecommunications, computing with frequencies higher than 100MHz, high-speed signal processing, and high-quality analog video (e. with the following layout parameters (width|space|width): Ohm. In particular, we looked at some of the basic stackup and routing rules needed to support a digital interface like I2C or SPI. 0. You should check their website out if your application uses a non-standard stackup for thin or high power applications. PCB stackup calculator. Note that the built-in impedance calculator does not account for the affect of vias, it assumes lossless transference from one signal layer to the next. 0. com . To open the Layer Stack Manager select Design » Layer Stack. Stackups must be kept symmetrical, so there must also be 4 mils of dielectric between layers 7 – 8. 4, that's why there is a difference in impedance values of microstrip and stripline. Linked to our 2D field solver-based impedance calculator to design high-speed traces; See what Laurent Nicolet has to say about the future of PCB etching. Launch Stackup Pro Iteq Home. Note that the built-in impedance calculator does not account for the affect of vias, it assumes lossless transference from one signal layer to the next. Altium Designer’s differential line impedance calculator will set up your impedance-controlled differential pair routing widths for you. Using a power plane as signal reference. 24 hours a day, 7 days a week. The stackup you choose certainly plays an important role in the performance of the board in several ways. 5 oz. 5 techniques to reduce ringing in PCB designs. Table 1. Prepreg. The material thickness between layers 1 – 2 should be 4 mils, max. Advice for 90 Ohm traces of a USB 2. 25. A fab drawing specifies all the important information such as board outline, layer stack-up, drill chart, and many more required to manufacture a PCB. Simulated traces and PCB stack-up. For PCB fabricators, Speedstack PCB interfaces with the industry standard Polar Si8000m PCB Controlled Impedance Field Solver. The IPC-2141 trace Impedance calculator will help make initial design easier by allowing the user to input basic parameters and get a. This includes key considerations such as PCB footprint design, component placement, soldering considerations, solder mask checks, BOM assessment, testing, and panelization. Thickness. The Layer Stack Manager includes an integrated field solver for accurate impedance calculations and copper roughness modeling. The stripline impedance calculator provided below is useful for gaining an initial estimate of trace impedance for striplines. 7 mil (0. I use Saturn PCB Design ToolKit -> Conductor. PCB Laminates & Materials Quick Turnaround Program; Why. A coplanar waveguide calculator will operate in one of two ways. The calculator is set up to handle an asymmetric arrangement, where traces are not centrally located in the PCB layer stack. The integrated field solver in Altium Designer also takes. The material used is FR-4 with a Dk of 4. PCB stackup calculator. 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. Released in 2009, it considers the impact of thermal conductivity, board thickness, dielectric material, and the presence. Abstract. The ratio of cross-hatch conductor width (HW) to cross-hatch pitch (HP) plays an important role while characterizing the cross-hatch plane. PCBWay manufactures multilayer circuit boards with layers in the range from 4 to 14 layers, board thickness from 0. One: A quick solving calculator lets you seek a target impedance by varying any one parameter, it could be line width, stack height or Er; you choose the variable and set the goal seek. They are very simple to read, and the. For instance MacroFab's stackup state a 1. The stackup used to build a real circuit board is a major determinant of signal integrity and power integrity. Gerber files are the output of circuit board design process. The stack-up operator places the copper foil (layer 4 in the above image) and prepreg sheets on a heavy steel base plate. Altium Designer's Layer Stack Manager and routing tools provide a smooth PCB impedance calculator for high-speed designs. Coplanar Waveguide Calculator. Layer 2 - Ground. Additionally, minimizing the routing from the pad to the via can save space. Using an online differential impedance calculator, the height of the dielectric layer, h, is needed. PCB stack-up with controlled impedance requirements. Signal problems can abound when trace width values are incorrectly specified in high-speed PCBs. It also has a major impact on the EMC performance of a product. Standard PCIe boards incorporate a 4-layer stack-up with two interior power planes and two signal layers on each surface. 293, 50% of the copper removal can be achieved. Impedance Calculator Trace Width, Current and Temp Rise Calculator Better DFM BOM Checker PCB Material Selector PCB Stackup Designer Talk to a Sierra Circuits PCB Expert today. Notice that there is no impedance information on the stackup drawing. A cross-hatch plane is shown in the image below. Linked to our 2D field solver-based impedance calculator to design high-speed traces; See what Laurent Nicolet has to say about the future of PCB etching. 3. The tool calculated impedance at 50 ohms for my stackup but it complains that it violates an IPC-2141A constraint where trace height over trace width must be less than or equal to 0. 4mil (1 oz) for plane layers. 10 layer PCB stack-up . You’ll also have access to an. I used the KiCAD PCB calculator, asked the PCB manufacturer about the tangent loss (0. Blind vias exist from: Layers 1 to 3; Layers 1 to 4; Layers 5 to 8 Stackup Editor Zoom: Hybrid Design Shield: Mask:. You can load a preset stackup in Altium Designer using the Layer Stack Manager. AP537. Distance between tracks (s) = 254 micron. Design for manufacturing (DFM) guidelines resolves potential issues that can occur during the manufacturing and assembly of circuit boards. Prepreg dielectric constant: Prepreg typeDielectric constant76284.