strip thickness is 1 oz copper, 0. Unfortunately, however, I am not using FR4. 150. So it should be possible for the velocity to change without the characteristic impedance changing, but. Generally, PCB trace thickness ranges from 0. 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. Among these 3 variables, the trace width I the one that is within the complete control of the designer. the width of the signal trace. Reading about it online I found out that IPC2221 was based on 50-years old measurement, and so it would make sense to use the newer IPC2152, but what troubles me is that the Trace Width for external layers. 8mm 1. This says that ALL 50 Ohm transmission lines in FR4 have exactly the same capacitance per length. The Chinese prototype board houses like JLCPCB offer 0. Generally, in your fab notes you just say "traces that are x mils wide are to be made 50 ohm" and the fab will adjust all those traces at the Gerber level to match them. For a transmission line of a given line width, the closer the distance to the plane is, the corresponding EMI will be reduced, and the crosstalk will also be reduced. This suggests that all 50Ω microstrip lines on FR4 substrate should have the same aspect ratio. 4). H 5 2. The microstrip is a very simple yet useful way to create a transmission line with a PCB. 58 -> digged this out from seedstudio fr4 spec documents Dielectric thickness: 0. Also, it would be nice if I can specify all dimensions in mils. Share. 0014″. High-speed designs carry a requirement for controlled impedance, crosstalk control, and the need for interplane capacitance. εr 14 RF / Microwave Design - Basics)Sometimes Dielectric surrounding Trans-mission Line isn’t Constant (Outer Layer Trace on PCB). The ideal microstrip width to depth ratio for a 50 ohms FR4 material is about 2:1. o 100 ohm differential impedance o 4. when I calculate required trace width for 50 Ohm impedance for 0. Total efficiency includes antenna. 363A, 1oz, 20c gives 5 mil. The 50 Ohm PCB trace width calculator computes the optimal width for a PCB trace to achieve a 50 Ohm impedance. For EMI reasons, I did a ground fill on the component. 1). 2mm, it may be better idea to use microstrip line, with. When we say "thick" or "thin" FR4, we're generally comparing to the standard thickness of 1. For example, there are a few factors that will limit your available trace width to get to 50 Ohms in a 4-layer stackup: Available materials: Remember that FR4 laminates do not have a specific dielectric constant (Dk) value, and this value is a big determinant of your trace impedance. Trace Width: Leave this blank so it calculates it. plot showing 50 Ohm trace thickness versus dielectric constant. Trace Width: Leave this blank so it calculates it. A microstrip width calculator can calculate the width of a microstrip. For example, there are a few factors that will limit your available trace width to get to 50 Ohms in a 4-layer stackup: Available. 5 typical "Check data sheet first, make note of intended frequency of use" trace thickness 1. For example, (50~Omega) on commonly-used 1. 150, 75, 50 Ohms: 120,60,40,30,20 Ohms: 240,120,80,60,48,40,34 Ohms: Memory data transfer speed. 4 mil. This is my first RF project so need guidance about that. After quite a reading I got to know that as the track width of a cline is decreased, there is a decrease in the impedance, Trace width is indirectly proportional to impedance. The next graph investigates this further. If you know the values of any of the two parameters (conductor width, max temperature, max current capacity) it determines. ) Setting the spatial resolution to the 200mil width of the. The height will depend on your PCB stackup, and what layer the ground plane is on. With practical linewidths it almost impossible to get an impedance outside of the 25 to 100 ohms range. 2 mm The TCI6482 sample PCB is routed using 4 mil traces and 4 mil minimum trace spacing. So, my impulse will run towards the load. the fibreglass resin dielectric must be a couple mm thick overall with copper and in order to get 50 Ohms the trace width to height for most FR4's is 2:1 (h:w) ( lower constant Dk e. 2uS, And the wavelength (λ) = C/f = 3*10^8 / 50*10^6 = 6m Where, C is the speed of light. The microstrip is a popular device in microwave radio technology. finished (outer layers) and . line width is swept for the case of a 4. Using the EEWeb Microscrip Impedance Calculator, I find that with 1oz/ft^2 copper and a substrate height of 0. “It’s also possible to get 50 Ohm on 1. 06 ohms per inch. S11 Looking into the Curved Dipole The impedance drops slightly (from ~51 ohms to ~45 ohms) as the shape is changed from an almost straight trace to a curved trace with a 20mm radius. For example, if you wish to input "25000000", just type "25M" instead. 6mm PCB (1/16"), use a 0. 3 can then be used to design a PCB trace to match. Search top-rated Class A, B, C, & towable RVs from just $35/night. 004" for 1 oz. (Figure 4. For a Dk = 4. In that case I need to design a transmission line which has characteristic impedance of 50 ohms. The trace width can then be calculated by re-arranging this formula to determine the cross-sectional area that. 5. trace thickness = 0,2 mm (from pcb datasheet) height of dielectric above return plane = 1,6 mm (from datasheet) I obtain a Z0 of 70,8 ohm. 2mm -> Seedstudio 4 layer DRU file, isolation between. I wanted to use Altium to calculate the width of the trace automatically, so that it had a 50 Ohm impedance. I have to calculate the Transmission line Trace width for 50 ohm FR4 6 layer PCB. For example, there are a few factors that will limit your available trace width to get to 50 Ohms in a 4-layer stackup: Available materials: Remember that FR4 laminates do not have a specific dielectric constant (Dk) value, and this value is a big determinant of your trace impedance. The characteristic impedance of the signal path is a continuous 50 ohm path relative to the closest ground. T is the thickness of the trace. Using the EEWeb Microscrip Impedance Calculator, I find that with 1oz/ft^2 copper and a substrate height of 0. 4 mil Core 2 Substrate Metal 2 1 OZ. 2. Following are my parameters-PCB - FR4 with a Dielectric constant of 4. Just a clean step. 00 0. 5 (assume 4,35) ; for 868MHz. But on lower Dk material (Dk=3. Probe with the oscilloscope where the function generator feeds into the PCB. A microstrip is a type of transmission line in which a strip of a conducting material like copper is mounted on a dielectric material and routed to a ground plane. There are always some variations caused by PCB manufacturer, such as width, etching slope, resin distribution of prepeg, thickness of prepeg, etc. 2 mil trace. Enter the relative permitivity, width of the trace, the ground plane spacing, and the substrate thickness to calculate the characteristic impedance. Although you only. You only need to worry about trace impedance matching at high frequencies, where the propagation delay of the trace length becomes a significant fraction of the waveform time period for one cycle of an RF signal or a significant portion of the rise-time for digital signals. So it's unavoidable to reduce tracks near a QFN pin. The trace impedance (Z) of a PCB trace can be calculated using the formula for microstrip transmission lines: Z = (87 * Log10 [ (2 * H) / (0. 2. 15. Dispersion is sometimes overlooked for a number of reasons. If we make the line width wider, we have to make the dielectric thicker to preserve the 50 Ohms, and this keeps the loop inductance the same. This rule states that if the trace is more than 1/3 of a rise time long, reflections (ringing) can occur. 035mm and Er = 4. Now. 6 mm thickness, 1 oz. Co: capacitance per unit length. Trend of trace width vs. So, a good range of Zo is 50 – 60 ohms. Relative Permittivity: 4. $egingroup$ There is a rule of thumb that the 50 Ohm trace width is around W = 2H. 4 GHz top layer and bottom layer 50Ω trace width: 6 mils • 2. 4 mil FR4 dielectric thickness o No differential coupling to neighboring differential channels Using other trace geometries or materials will lead to different results than shown here. The layout is here: I also placed vias to ground near the 50 Ohms trace at. However, other impedance values are. Thanks for the. 50 ohm trace width fr4 - A 4-layer PCB stackup with 50 Ohm impedance has a narrow range of PCB trace widths. Copper (trace) thickness: 1 oz/ft^2. ρ– Bulk Resistivity of Copper (6. (The PCB is FR4 and a Dk of 4 is assumed. dielectric height is a standard 2 layer board, it is 1. 363A, 1oz, 20c gives 5 mil. 725. Regards, Istvan Novak Oracle On 11/23/2013 7:59 AM, sunil bharadwaz wrote: > Hi friends , > We are designing a dual band receiver ( 2. That magic 50 Ohm is calculated from ZL=sqrt (L'/C') of the transmission line, where L' and C' are capacitance and inductance per unit length. The equations use "a" for the track width and "b" for the sum of the track width plus the gaps either side. 2. I tend to deal with microstrip on multilayer boards where the trace width is very similar to the width of. When you want to determine the width and length of a microstrip line for any given characteristic impedance and electrical length, or vice versa, a microstrip calculator is the right tool to do so. g. Er:4. The down side is that for thin tracks, it is very hard to get controlled 50 Ohm impedance. Why does a 4 layer PCB board significantly reduce the trace Width needed for a 50 ohm transmission line when compared to a 2 layer PCB board? Hot Network QuestionsTrace 50ohm±5%; Multilayer pcb; fr4 pcb; Product description: when to use controlled impedance 50 ohm controlled impedance what is impedance matching in pcb how to specify pcb impedance an introduction to the design and manufacture of controlled impedance pc; INQUIRY. I am designing a USB-hub that has many USB traces. 750000 Permitivity of Prepreg 2125 = 4. 6 fF/mil width capacitor there if you’re on FR4 with a 50-ohm microstrip line (because you’re adding about a half line-width extra capacitance. The ground reference plane for the 50 Ohm trace going from the antenna pad to IS2083BM is probably on. , when its width was set to the same width of the 50 Ohm input lines (13 mil). Thank you! pcb; microstrip; Share. If you're routing with 50 Ohm impedance and you need to design a 4-layer. Then I noticed that one was using IPC2221 (older) and the other was using IPC2152 (newer) as the standard to calculate the result. 7 ohms; common impedance: 19. 75 mm=30 mil). 4, loss tangent = 0. 003-0. **Note: Like our stripline impedance calculator, all of our RF calculators allow SI prefix input. First of all, I calculated the width of the trace, using this link: Copper Thickness: 35µm Dielectric thickness: 0. The transmission line needs to be 50 ohms as it connects directly with a 50 ohm matched impedance IC, of which the leads are around 0. 4 DisplayPort Parameter Value Frequency DisplayPort 1. 5; results odd impedance: 45. 4) requires a 5. Just How Wide Should a PCB 50 Ohm Trace Width Be?. Finally, make sure to connect the GND planes with a via nearby wherever a signal transition is made. (6) H is the. For double sided FR4 with 1. 1 ohms; In addition to those calculation I found some other resources with some sample trace properties: Mikrocontroller. 949. The goal is, of course, to get as much bandwidth as possible, but realistically I'm shooting for a minimum of ~1 to 250 MHz. From: Scott McMorrow <scott@xxxxxxxxxxxxx> To: steve weir <weirsi@xxxxxxxxxx> Date: Sat, 23 Nov 2013 10:13:05 -0500; The problem is most likely ENIG gold plating. are not 1 MHz, then using this value is not correct for trace width calculation. 0), the same impedance could be achieved with an 8. This material is incorporated in single-sided, double-sided, and multi-layered boards. Larger ground clearance lowers capacitance, increasing impedance. Feed. [SI-LIST] Inserion loss of fr4 , 50 ohm trace . When I designed the testers, I usually chose 90 ohms; lower current yet and it's close to ribbon cable (~100 ohms). I made a small 4 layer 1. Applications. 4 GHz top layer and bottom layer 50Ω gap width: 6 mils Table 1-1. 048 x dT0. The trade off is cost. A targeted impedance on a PCB trace can be attained by varying its width. Where: H is the height of the PCB above the ground plane. g. Placing the driver or receiver close to the connector, so the length of mismatched 50 ohm trace is very short solves this problem without requiring a 72 ohm trace on the PCB. 1mm)Better to distance the RF trace away from other traces and pads, and if you can move the connector to the left 2 mm or the IC right 2mm would be better. 149 Roms Jr Hindi Typing Tutor Download Ditari I Ana Frankut Pdf Fifa 15 Pc Download Torrent 14 Line Quran Taj CompanyEach square has a resistance of 1mΩ, so the total end to end resistance of the trace is 10 sq × 1mΩ = 10mΩ. 24. If you look, the impedance at both sites is approximately 50 Ohm. so i want to know that it is called micro-strip or strip-line? i have check the calculators like. Note: The results are only for approximation and rough estimation, the final values and the. 6mm. So, for example the length for a 100 ps delay with FR4 is. I used some online calculator to calculate parameters of trace so it has 50 Ohm impedance. 33,290. Instead, Fr4 is a standard defined by the NEMA LI 1-1998 specification and covers a set of properties that the material used needs to comply with. 5 equal-ripple when the order(N)=3, center frequency=2GHz, bandwidth=10%, Zo=50(ohm) and attenuation at 5 GHz - many of you will find this problem familiar since it's from Pozar's microwave engineering textbook. dielectric constant er is 4. You can use our calculator to determine various trace components, such as trace temperature, maximum current, resistance, voltage drop and power dissipation. With PCBWay impedance calculator, you can calculate the approximate impedance of your PCB / high frequency circuit board. [4] Er or “Epsilon sub R” is the dielectric constant of the material. 6 mil "measured copper top to bottom" er of FR4 = 4. Polar or rectangular grids only allow direct reading of S11. For a dielectric material, since resistivity is very high, it is usually expressed in units of Mohms or Mohms per square. For a pure inductor of inductance L Henries, the impedance ZL= jωL Ohms. board materials have distinct dielectric constants, which are related to the resin materials used. For RF, this is often done. FR4, four layers, PCB thickness is 0. 2. 5 mil trace width for differential impedance of 95 ohm and 9. 4mm FR4 is 0. 2mm. There are some advantages to using a microstrip transmission line over other alternatives. The typical 50 ohm microstrip, on 1. trace width, and the board thic kness between the trace and the ground. 6mm, dielectric is FR4 (which I know isn't ideal and doesn't specify exact performance - cost reduction is important to this design). We would like to show you a description here but the site won’t allow us. One of the most common is FR4. I want to derive the relationship like above between the other. e. 7 Buck Layout GuideI get the idea of a 50 ohm trace. But the trace width that results from this is different. 8 to 4. 4mil required impedance 50 Z frequency 100Mhz calculated width of trace = 110 Mils This says that ALL 50 Ohm transmission lines in FR4 have exactly the same loop inductance per length. 0 requires 90ohms differential impedance (max 45ohms per track) Max trace-length mismatch between High-speed USB signal pairs should be no greater than 3. For my results, I find that the minimum inductance is 292 nH per meter when ( w/h) = 1. Line Width: 4mil (0. PCB Impedance control, differential pair/single end ohm. It shows the minimum trace-to-ground spacing required to. 725. 6 mm • 2. I'm using FR4 and this is a 2-layer board. 33,290. 0175 Ohm mm²/m is the specific electrical resistivityThe initial portion of the simulation waveforms for the load end voltage (green waveform), for a 1V step injected into a 50ohm Z0 transmission line with delay=70ps, with source resistance =200ohms and output capacitor 1pF, showing the capacitor voltage charging to Vfinal(1-e-2Td/Z0C)= 0. The upper limit to reliable operation, physically speaking, is due to electromigration. 378 [mils/oz]) For IPC-2221 internal layers: k = 0. copper CPWG, using solder mask on top Trace width: 35 mils, Clearance to adjacent ground plane: 8 mils This gives an impedance of 52. ArchiveAll configurations represent 100-ohm differential microstrips, operating at 2. mm, and 3 mm of FR-4, microstrip trace width of 6 mm (50Ω impedance). In the ECL mainframe days, 80ohms was the normal trace impedance (some used 50 ohms for clocks). 0008). If I change the impedan ce to 50 ohm with trace width of 50 mils will see significant improvements in rx and tx of data? 50 Ohm Impedance; 50 Ohm Trace Width Calculator Formula; 50 Ohm Impedance Trace; Transmission Line Width Calculator;. Terminate the trace at one end with a small SMT 50 Ohm resistor (49. 45 GHz. This works fine, I ordered impedance control several times - no need to change the width. 02 similar to FR4 and the conductor losses turned on. Copper (trace) thickness: 1 oz/ft^2. Equation 6 can be used to calculate the characteristic impedance for an FR4 board. Instead of using a standard 1. A good resource for calculating the trace width for impedance is Saturn PCB. 26 dB. 0 up to 4. Board width is 1. I am currently working on a design in which one of my ICs specifies the use of a 50 ohm trace. It also explains the factors that affect the impedance, such as trace width, dielectric constant, and frequency. Surface resistivity is expressed in units of ohms or ohms per square. 8 mm Relative permittivity: 4. if I change the impedan ce to 50 ohm with trace width of 50 mils will see significant improvements in rx and tx of data? Reguards. Halogen-free materials have a higher Er, in the range of 4. 1 Impedance PTN33xx and CBTL061xx I/O impedance is targeted at 50 Ω single-ended and 100 Ω differential. 5 dB. SparkFun Forums . From the perspective of PCB design, 50 ohms is also selected after comprehensive consideration. 3mm material as well? Or a tool to calculate? Thanks a lot! Jorg. Enter the same substrate parameters and 14 mil for W. 5 Ghz ) on a Fr4 > substrate . Control 50 ohm impedance In the environment of common board (FR4, etc. This means the cables need to be. You can access serveral online sites to help calculate a trace with Z0 of 50 Ohm. Signal Speed. 0001, 3um gold, conductivity 3. 7mm is correct for 1. trace thickness = 0,2 mm (from pcb datasheet) height of dielectric above return plane = 1,6 mm (from datasheet) I obtain a Z0 of 70,8 ohm. Close to get exactly 50 ohm you need 2 mm trace width . Antennas are very sensitive to their surroundings and thus, when an antenna is embedded into a PCB, the. The answer to this question, Characteristic impedance of a trace, shows that a 120 mil trace is required to get this impedance. An ideal 6-layer stack-up is shown in. Consider that the bond wire inside the IC package neither continuous 50 ohms impedance. Which apparently is in the 10^7 A/cm^2 range. I'm also using OSH Park to produce my PCB. At DC your trace will still be very low impedance (resistance). 5. Joined Mar 14, 2008. dielectric height is a standard 2 layer board, it is. The problem with this stackup is that to achieve 50 ohm routing, the width required on the top layer is 396µm (approx 18mil), which is quite a. Frequency: Frequency at which the stripline is analyzed or synthesized. > > The length of the 50 ohm RF trace ( CPW - 15 mil trace width & 18 mil spacing > to ground ) , > is approximately 5 cms . Step 1: In the first step of the impedance optimization process, the width of the co‐planar gap on layer 1 was optimized to 50 ohms by performing successive simulation sweeps of co‐planar gaps. You can make a fifty ohm line 10 microns wide, or 50 microns wide, by adjusting the gap dimension. Feb 5, 2020 at 8:51. With 4 layers, they could get a ground plane just some 100 - 200 µm away from the top and bottom layers. You can access serveral online sites to help calculate a trace with Z0 of 50 Ohm. 1/2Oz copper 1. Similarly, we can plot the propagation delay versus dielectric constant. 3. 5mm, gap between feed trace and copper pour is 0. Typically the thickness between layers 1-2 and 3-4 are close together (approx. 4 mils or 0. The surface finish is neglected. Seeed Fusion promises mature PCB manufacturing and fabrication with low costs, quick build time and 100% quality guaranteed. PCB Impedance-Calculation: Help with the dimensioning of the impedances of your circuit board. If you are not sure about choosing the material, click on the material selector compare guide. ductor Width & Thickness and a Function of the Dielectric Constant ( ) of the Mat-erial surrounding the Lines. Heat is generated through ohmic heating P = I2 ⋅R P = I 2 ⋅ R of the copper trace. 500000 Permitivity of Fr4 = 4. Yes, since 50 ohm microstrip on 1. 65mm width. This is best summarized in a graph. 44 x A0. Some manufacturers will accommodate other specific thicknesses of 0. Read this blog and learn how you should size your traces in your PCB design to keep temperatures in check. Where electronics enthusiasts find answers. 8) Intrinsic Impedance, Z 0: Ohm: Fc. For example, high speed designs will typically always keep power and ground planes on adjacent layers for decoupling and. Placing vias to the internal ground planes is recommended. And yes, its very wide. the requirement of the impedance is 90 Ohms. The width of the strip, the thickness of the substrate,. 3 can then be used to design a PCB trace to match the impedance required by the circuit. In this layout two vias are used with a trace between them that also helps isolate the LBin and HB1in paths and components. It was invented because of the physical limitations to the manufacturing of inductors and capacitors at such very high frequencies. Requirements: A premium is charged for trace width/spacing less than . Shaving down the trace width increases its impedance. length = 100 mm; thickness = 35 μm; height = 1. If your board is 0. 363A, 1oz, 20c gives 5 mil. 25 mil trace width o 2 mil trace copper thickness o 5. Instead of using a standard 1. 4 The feed is generally of 50 ohm in most RF PCB catering to low -power wireless applications. T=trace height . These mean that the width ofA stack-up describes the construction of a multilayer board in sequential order. 260. 61 Asc Timetables 2016 Mac Firegl V3100 Driver Windows 7 How To Change Macbook Air Keyboard Language Mame 0. 57 mm. 6-layer PCB example. Thickness: Thickness of the stripline conductor. ago. N. You can design a 50-ohm PCB trace using one of the many online calculators. With positive dispersion (the dielectric constant increases with frequency), higher-frequency components arrive at a load later than lower-frequency. Or it is better to go with 50 Ohm lines, but here i unsure how to make best. 008 Inch to 0. The plot below shows the transfer function magnitude and phase for a transmission line on FR4 (10 cm stripline, 0. [SI-LIST] Re: Inserion loss of fr4 , 50 ohm trace . They can give you dielectric constant data and a trace arrangement that hits a particular impedance. We recommend the software from Polar Instruments if you want to get exact impedance calculation. 9 pF would have a similar . Quartz, H=254 um (10 mils), W=540 um, ER=3. You only need to worry about trace impedance matching at high frequencies, where the propagation delay of the trace length becomes a significant fraction of the waveform time period for one cycle of an RF signal or a significant portion of the rise-time for digital signals. 4 mil) has an approximate resistance of . Simple rough calculation: A 1mm track on 1. 55 mil should give 50 Ohms. Page 6 of 9 impedance, at low frequency. [SI-LIST] Re: Inserion loss of fr4 , 50 ohm trace . Acknowledgements: The source for formulas used in this calculator (except where otherwise noted) is the Design Guide for Electronic Packaging Utilizing High-Speed Techniques (4th Working Draft, IPC-2251, February 2001. If im using an FR4, how much loss can i expect with a 60ohm 1inch trace vs a 50ohm one? If i have a 2inch trace and a 4Ghz high band antenna matching…The Datasheet says that the target impedance of the RF Trace should be 50 Ohms as a controlled impedance. So this is a diff pair with a Z of 90 Ohms. A 1mm dielectric seems a bit too thin to me. For a 433MHz line it will be between 4. For instance the track will have to nip-down in width to feed a chip at some point and this could never be 50 ohms but it doesn. A rule of thumb for today - 50 ohms impedance microstrip has a w/h ratio of 2 on FR4. This has always worked fine in my projects: FR4 PCB 2 layer, 1. Since characteristic impedance of CPW is Zo= 50 ohm which is connected to load of ZA=50 ohm, using the following below relation, Zin should be always 50 ohms irrespective of βL based on mathematics as numerator. There are always some variations caused by PCB manufacturer, such as width, etching slope, resin distribution of prepeg, thickness of prepeg, etc. This is independent of the actual width or dielectric thickness. 1 Answer. Obviously the IC pad is smaller, and it's ok to use narrower traces for short distances as you connect the SMD components, but as soon as possible, do a smooth taper up to the 2. 510 mm, or 20 mils, and the minimum inductance is 292 nH/m. The legend for all three curves is shown on the middle curve and that is a transmission line built on a 10mil thick RO4350B. 2 and 4. 92mm over a ground plane 1. ArchiveSparkFun Forums . The IC only has room for 18. PCB Stack Specifications Parameter ValuesAs I understand it FR4 is pretty much the cheapest/easiest material to use, but will have poor performance at high frequencies. I get the idea of a 50 ohm trace. 031” FR4, the max. 8 mil traces, and that is assuming no space between. 5. 3 as fr4 material with 1. 4 mil FR4 dielectric thickness o No differential coupling to neighboring differential channels Using other trace geometries or materials will lead to different results than shown here. W is the width of the trace. Typically, this will be 35 or 70 microns depending on how the stack-up is defined. To get a 50 Ohm characteristic impedance, you just have to define your trace width in the proper proportion to the H of your dielectric (with some small adjustments for T met and dielectric and conductor loss terms). 93A, 1oz, 20c gives 50 mil trace width and 0. 75 ohm at ambient temp and 0. I#39m using FR4 and this is a 2-layer board. Back dril from Bottom : 7 Layers / Files. 6mm will be about 3. 5 mils × 807 mils) for an FR4 PCB with 1. finished copper weight (inner & outer), the minimum trace width/space is. 22 mm; trace.