SMT, PCB Electronics Industry News

Designing a Multilayer PCB Layout

Oct 18, 2018

1. Always select an even number of layers when designing a multilayer boards because you will use both sides. 

2. Some designs will require the specification of the thickness of the dielectric, typically for impedance causes. For these situations confer with your board manufacturing facility to choose the dimensions for its core or prepreg thicknesses available. 

For the thicknesses of dielectric, the prepreg is determined by the type or an assortment of various kinds of materials. The PCB manufacturing facility will tell you what mixture of prepreg will work well and what dimensions and tolerances can result. 

It is best to talk with the PCB manufacturing facility about and unique dielectric specifications while you are designing your PCB. This gives you time to obtain the materials when required. In addition, the production processes can be talked about before the opportunity passes for making changes to your design. 

Note: The cost of materials is based on much more than the thickness. Various parameters such as the amount of plies, the type of material, thickness tolerances, and even the supply relative to the need of the materials determines the final cost. In cases where there is not a specification of the thickness of the dielectric, tell the PCB manufacturing facility to determine the ideal material to use. It will select materials based upon industry standards, attractive cost and the best manufacturing methodology. 

3. To ensure the lowest bow and twist, the board should have a balanced layout relative to the board’s Z-axis median. The balance is determined by:

  1. Thickness of the dielectric per layer
  2. The distribution and thickness of copper per layer
  3. The placement of the circuit and the layers of the plane

A higher number of plane layers is typically the result of an increased number of layers overall. Plane layers are best placed internal on the PCB such that they are balanced about the Z-axis median of the layout. 

Boards will meet the highest allowable bow and text of 0.25mm per 25mm (1%) or better when the best design rules for multilayer boards are used. 

4. Circuits in the outer layers of the PCB 

Ensure there exists a balance in the circuitry regions and their distribution relative to the front and rear of the PCB. 

Take into account the external plane’s low pattern density relative to its plating thieving. 

5. Tolerances for Thickness 

The tolerances for thickness will always get bigger as the multilayer PCB’s total thickness increases. It is a sound idea to require a tolerance of ±10% of the total thickness. 

Document where to measure the thickness such as glass to glass at rail guides, over gold contacts, over solder mask, etc. 

Consider the essential characteristics of design when determining the probable PCB thickness. For example: Have you receded back the plane layers relative to the gold contacts? If so, the PCB thickness should not include the copper part of the planes when you are measuring across the contacts. 

Note: The width and density of the signal lines and the open plane areas are dependent upon the thickness of the copper relatives to the total board thickness. Regarding the total thickness of the PCB, you may find that the prepreg may have an isolated 0.15mm line embedded in it. Discuss with your PCB manufacturing facility when the total thickness is an important consideration. In general, statistical material measurement data depends on the required overall thickness tolerance. In general, ±10% is a good amount. Closer tolerances are obtainable based on the multilayer layout design, as well as the materials. You should discuss with your PCB manufacturing facility if closer tolerance are an importance consideration.

http://www.flason-smt.com/new/Designing-a-Multilayer-PCB-Layout.html

When SMT matter to your business, partner with Flason. Where innovation takes form.
reflow oven lead free reflow oven LED strip reflow oven dual rail reflow oven custom reflow oven China reflow ovenSMT Peripheral Equipment SMT reflow oven 
wave soldering machine pick and place machine lead free wave soldering machine custom wave soldering machinecustom pick and place machine SMT Assembly line
SMT Reflow Oven Manufacturer Wave Soldering Mahchine Manufacturer Pick and Place Machine Manufacturer Reflow Oven Manufacturer SMT Spare Parts LED Pick and Place Machine
Andrey: sales@flason-smt.com Wechat whatsapp:+86 13691605420

Keywords: Reflow Oven SMT Reflow Oven Wave Soldering Machine SMT Stencil Printer Pick and Place Machine SMT Inspection machine SMT Assembly Line SMT Peripheral Equipment SMT Spare Parts reflow oven lead free reflow oven LED strip reflow oven dual rail reflow oven Custom reflow oven China reflow oven SMT Peripheral Equipment SMT reflow oven wave soldering machine pick and place machine lead free wave soldering machine custom wave soldering machine custom pick and place machine SMT Assembly line SMT Reflow Oven Manufacturer Wave Soldering Mahchine Manufacturer Pick and Place Machine Manufacturer Reflow Oven Manufacturer SMT Spare Parts LED Pick and Place Machine

For More information,visit US: Reflow Oven Manufacturer or SMT Reflow Oven Wave Soldering Machine SMT Stencil Printer Pick and Place Machine SMT Inspection machine SMT Assembly Line SMT Peripheral Equipment SMT Spare Parts SMT Feeder SMT Nozzle Feeder storage cart USB Flash Drive Manufacturer wave soldering machine manufacturer Email us: sales@flason-smt.com

Dec 08, 2018 -

Lead-Free (Pb-Free) Solder and Composition

Dec 08, 2018 -

All about Semiconductor

Dec 08, 2018 -

Top 10 Consumer Electronics Companies in the World

Dec 08, 2018 -

How Electronic / Electrical Circuit Works

Dec 08, 2018 -

Ball Grid Array (BGA) Package

Dec 08, 2018 -

SMT Dictionary – Surface Mount Technology Acronym and Abbreviation

Dec 08, 2018 -

Printed Circuit Board (PCB) for Surface Mount Technology (SMT)

Dec 08, 2018 -

Basic Soldering Guide – How to Solder Electronic Components

Dec 08, 2018 -

RoHS Guide in Electronics: RoHS, WEEE and Lead-Free FAQ

Dec 08, 2018 -

Electronic Components, Parts and Their Function

134 more news from Flason Electronic Co.,limited »

Jan 20, 2019 -

Why is an antenna’s impedance always 50 ohms?

Jan 20, 2019 -

How do Over Voltage protection circuits work?

Jan 20, 2019 -

How do I check the SMD capacitor stat, died or good?

Jan 20, 2019 -

Frost & Sullivan Global Placement Company of the Year Award Goes to Europlacer.

Jan 20, 2019 -

MicroCare Returns to Southern Manufacturing & Electronics with its Latest Advancements in Cleaning Stand #J145

Jan 18, 2019 -

What are the effects and advantages of aluminum coil for PCB drill entry?

Jan 18, 2019 -

How can you reduce the power consumption of a desktop computer?

Jan 18, 2019 -

How do you know if a resistor is bad?

Jan 17, 2019 -

Speedprint to Demonstrate Small to Large at APEX 2019.

Jan 17, 2019 -

MIRTEC Appoints Kirby & Demarest in the Pacific Northwest

See electronics manufacturing industry news »

Designing a Multilayer PCB Layout news release has been viewed 76 times

FPC* - Fluid Pressure Control - Dispensing Pump

Dual Mode 3D AOI/SPI