< img height="1" width="1" style="display:none" src="https://www.facebook.com/tr?id=1724791474554128&ev=PageView&noscript=1" />

KERAMIK PCB Design Guide

I know ceramic PCB design and layout can be overwhelming without proper knowledge.

So, this guide will take you through the fundamental aspects of the ceramic PCB design process.

Let’s keep reading to learn more.

Kapitel 1 Understand What Ceramic PCB

Chapter 1- Understand What Ceramic PCB

First, you should know that these are ceramic material base printed circuit boards.Ceramic is known
for excellent thermal conductivity, it maks heat dissipation more efficient.

Broadly, there are many types of ceramic PCBs available in the market. However, you can classify any
ceramic PCB design depending on the manufacturing process and technique.

So, you can classify ceramic PCBs as:

  1. Thick film ceramic printed circuit board
  2. High-temperature ceramic printed circuit board
  3. Low-temperature ceramic printed circuit board

Therefore, it is essential to know the ceramic PCB you need to design.

Kapitel 2 Why You Need Ceramic PCB

Chapter 2: Why You Need Ceramic PCB

An excellent ceramic PCB design offers a range of benefits in the modern electrical and electronics

First, ceramic PCBs offer excellent thermal properties. Remember, overheating and hot spots are
common phenomena.Besides, overheating is a common cause of electrical component failure. With
an excellent ceramic PCB design, you can quickly solve this problem.Additionally, ceramic PCB has a
low Coefficient of Thermal Expansion (CTE).

In addition, ceramic PCB designs also guarantee:

  • Bessere chemische Beständigkeit
  • Excellent high-frequency performance
  • Simple and easy to implement high-density circuit
  • Safe operation even at elevated temperatures of 350 degrees Celsius
  • Lower cost, hence reduces the cost of implementing electrical components
Kapitel 3 Specify Ceramic PCB Before Design Process Starts

Chapter 3: Specify Ceramic PCB Before Design Process Starts

The design of ceramic PCB substrates starts by knowing the unique specifications you want.

The key elements you should specify when choosing ceramic PCBs including:

  1. The number of layers – you should specify the number of layers of ceramic PCB design. For instance, you can choose single layer or multilayer ceramic PCB design.
  2. Base material – it is an essential aspect of ceramic PCB design. The substrates you can choose from including Aluminum Nitride, Aluminum Oxide, Beryllium Oxide, Boron Nitride, and Silicon Carbide. The fundamental parameters you should consider in your material selection include thermal conductivity, coefficient of thermal expansion, dielectric constant, signal loss, light reflectivity, dielectric strength, and rupture strength.
  3. Board size – Ceramic PCB designs come in various sizes depending on your unique requirements. Therefore, there is no standards size – it will depend on your application requirements.
  4. Surface finish – the surface finish may include ENIG, immersion silver, or immersion tin.

Other fundamental aspects you should include are substrate thickness, copper weight, track width, dole diameter, and plated via aspect ratio.

Of course, at this point, you should be clear on the specific application of the ceramic PCB design.

Once you have all these, the ceramic design process now begins.

3.1 Focus on Ceramic Design and Drawing

3.1 Focus on Ceramic Design and Drawing

Once you know all the specifications, having the correct PCB schematics and drawing is another critical aspect.

Of course, you should save the drawings in a suitable file format.At this stage, you need appropriate PCB design software.

3.2 Choose Suitable Ceramic PCB Design Software

3.2 Choose Suitable Ceramic PCB Design Software

Today, there are many ceramic PCB design software available. Whether you want paid or free ceramic PCB design software, you will get one that meets your needs.

Some of the most common Ceramic PCB design software to choose from including the following:

  • Autodesk-Eagle
  • Altium Designer
  • KiCad
  • ZenitPCB
  • Osmond-Leiterplatte
  • EasyEDA
  • PCBWeb Designer, and
  • DesignSpark-Leiterplatte

Focus on the drawing once you know the ceramic PCB specifications and have appropriate design software.

3.3 Classify and Know the Type of Ceramic PCB Design Drawing

3.3 Classify and Know the Type of Ceramic PCB Design Drawing

There are many ways you can classify your drawings during ceramic PCB design.

Remember, PCB drawings and schematics are vital tools we use for communication in fabrication processes. Let’s look at some most common drawings you can use during ceramic PCB design:

3.4 Gerber Data from Customer

3.4 Gerber Data from Customer

For PCB design and fabrication, the Gerber file format is quite popular. It is a common standard in describing various aspects of the PCB drawings.

Although RS-274-D was popular, today’s PCB industry is dominated by the extended Gerber (RS-274X). Here, the PCB manufacturer will use the information from the customer for the fabrication process. These will include all drawings and vital files.

However, at times customers may not provide the original pictures. In such situation, the PCB manufacturer is responsible for interpreting and redesigning the Ceramic PCB according to customer requirements.

However, if the manufacturer decides to redesign the ceramic PCB, the customer must confirm. This makes the next stage even more critical.

3.5 Customer Should Confirm Ceramic PCB Designs Drawing

3.5 Customer Should Confirm Ceramic PCB Designs Drawing

Whether you make adjustments or work with the drawing customers sent, you must confirm that you are using an appropriate file.

This will eliminate any possibility of customers’ rejecting the final ceramic PCB design. You should conduct a thorough check on the Gerber files you receive from customers as a manufacturer. From this, you can make a questionnaire alongside an array layout. Only after customer confirm can start the ceramic PCB drawings.

3.6 Ceramic PCB Array Layout

3.6 Ceramic PCB Array Layout

A PCB array refers to appoint where you replicate a single PCB many times. It is common in PCB manufacturing processes alongside panelized, palletized, or stepped out. Usually, the PCB array helps in the printed circuit board assembly process. You can quickly load parts faster, saving both time and money.

Of course, this makes the automated assembly process easier and faster. Depending on your specific requirements, you can choose from:

Scored Arrays; offers smooth board edge, which is usually consistent. Besides, it results in low wastage. As a result, you will guarantee significant cost savings.

Tab Routed Arrays; tab routed arrays are always a perfect choice for irregular shapes or overhanding components.

You can opt for a mixture of scored arrays and tab routed arrays, depending on the design. Of course, during the ceramic PCB design, the customer must confirm the type of PCB array.

Among the general and vital guidelines, the customer must confirm including:

  • Size of the array – the size may vary depending on the specific dimensions and requirements of the customer.
  • Passermarken – you will use it to achieve the alignment targets you need. They are the most circular copper pads.
  • Schienen – you can include rails on all sides of a printed circuit board or only two sides. The rails make handling easier.

In addition to these, other aspects you should consider include tooling holes and spacing of arrays. Therefore, you must work with ceramic PCB design with the ability to execute all these precisely. Other vital aspects you should check about array layout include:

3.7 Umrissgröße

3.7 Outline Size

As a general rule, our ceramic sheets come in three sizes including:

  • 114.3 * 114.3mm
  • 120 * 120mm
  • 127 * 127mm

Although the customer’s needs may vary slightly, the width of the narrow side can be 3mm. While on the long section, the width can range from 4 to 5mm.

However, remember the ceramic PCB design should not be smaller when you compare it to the narrow side width

3.8 Drilling Diagram For Ceramic PCB

3.8 Drilling Diagram For Ceramic PCB

This drawing is critical for the subsequent ceramic PCB design, fabrication, and assembly stages.

You will drill holes on ceramic PCB for the following principal reasons:

  1. To interconnect different layers of ceramic PCB
  2. Allow for placing components on ceramic PCB during the assembly process Well, you need an accurate and reliable PCB drilling technique – that’s where laser drilling comes in. Remember, you will wish to drill tiny holes such as micro vias. This is common when you want to implement HDI technology.

Laser drilling is crucial since it:

  • Offer precise control.
  • Guarantees high aspect ratio.
  • Reduces damages on the PCB since it is a non-contact process.

Therefore, the laser drilling diagram plays a pivotal role in the subsequent PCB fabrication and assembly process.

So, customers should confirm that the drawing conforms to the ceramic PCB array layout.

The PCB manufacturer and customer must inspect the diagram to ensure it meets the correct specifications.

3.9 Analyzing Laser Drilling Diagram

3.9 Analyzing Laser Drilling Diagram

Depending on the specific requirements, refer to the PCB layout diagram to edit the punch diagram.

You can distinguish different graphics using different colors. Of course, this also applies to graphics that correspond to other process parameters.

You can divide them into:

  • Via layer (cyan, dot)
  • Round hole layer (red, circle)
  • Oval or square hole layer (yellow, multi-line segment)
  • Cutting line layer (blue, line)
  • Material number layer (color No. 11, multi-line segment)

During the laser drilling PCB, you may meet some losses.

It implies, to achieve the standard size of the hole as indicated in the drawing, make the diameter of the round hole smaller than 0.01mm.

If the original diameter for the round hole is 1.30mm, the punching drawing should be 1.29mm.

Of course, you can apply the same principle for the round hole.

By doing so, you will prevent possible mistakes which can be costly.

Remember, the production process should not change the initial ceramic PCB design drawing.

Only the responsible personnel, together with the client, can make some of these modifications.

3.10 Film Circuit Drawing

3.10 Film Circuit Drawing

This is yet another vital part of ceramic PCB design.

Remember, you will use film for product graphics transfer.

It would help if you inspected the drawing for the subsequent production line even at this stage.

Again, there are two options here:

  1. Trockener Film; you can choose either photodecomposition type or photopolymerization type. Usually, dry films are easier to process and not affect the PCB holes. Additionally, it is best for a high-density circuit. However, the dry causes limited resolution in PCB circuit patterns.

The best part – it is affordable.

  1. Wet film; has photosensitive liquid resist. It is perfect for a ceramic PCB design with an uneven surface. With wet film, you can quickly achieve high precision in terms of uniformity and thickness.

In short, ensure the ceramic PCB design has the best film circuit drawing.

Here are some fundamental aspects you need to note about circuit film image:

  • Film frame can be 250 by 250mm – of course for both negative and positive film
  • Black sections will mainly be copper paved
  • Sections transmitting light are the trench
  • You can expand a single product by 0.01mm. Remember, the minimum gap should be 0.067mm.
  • The film should have vital information such as product number, version, film production date, manufacturing order, and any other essential code

Even at this stage, inspecting the drawing should cover a single piece’s critical dimensions and size.

3.11 Evaluate Solder mask File Data

3.11 Evaluate Solder mask File Data

Solder mask is a protective layer you will apply on the ceramic PCB.

It protects the copper from oxidation or possible shorts during the soldering process. So, it is crucial to share drawings for the solder mask in the ceramic PCB design. Of course, the inspection team in the company and customers must be in agreement. Although most solder masks are usually green, you can choose other colors such as blue, red, black, or transparent.

3.12 Film Chart

3.12 Film Chart

The solder mask film frame is 300 by 300mm in most cases.

Additionally, you can reverse the negative film.

Also, the area with solder masks is light-transmitting. Of course, the back section is a non-solder mask.

White oil film should widen 0.03mm for the form channel. Such as the original channel, also 0.12mm.

You should have a film compensation design of about 0.15mm.

In this film, you should indicate the following parameters:

  • The material number for the product
  • Versionsnummer
  • Film production date
  • Anzahl der Filme
  • Manufacturing order number
  • Code, etc

Again, if the line width is more than 0.25mm, you don’t need special instruction.

It would be best if you inspected the film drawing. The process should cover all dimensions and sizes of a single piece.

3.13 Verify the Dimensional Measurement Char

3.13 Verify the Dimensional Measurement Chart

Inspecting the ceramic PCB drawing involves evaluating various dimensions.

It would help if you considered single-piece and panel size dimensions.

Check and confirm the product specifications and performance requirements.

In short, you should verify every aspect of the drawing. This will ensure all your designs meet required design specifications.

Some of the dimensions are:

  • Length and width of the product
  • Positioning hole size and location
  • Single-particle size
  • Kanalgröße
  • Single-particle spacing
  • Alignment offset
  • Beschichtungsdicke

Here are other requirements that may apply: dead pixel identification, roughness, and warpage requirements.

3.14 Analyze Ceramic PCB Design and Drawing Specifications

3.14 Analyze Ceramic PCB Design and Drawing Specifications

There are several aspects you should confirm at this stage;

  1. Critical dimensions of ceramic PCB design
  2. Key product parameters of ceramic PCB design

You need to compare the data or information you want to use against customers’ specifications. Remember, the drawings customers provide are their property.

Therefore, you should protect it by all means by signing a non-disclosure agreement. They should be stamped.

As you evaluate all the drawings and dimensions, remember to note any deviations.

Of course, at every stage, let customers know the progress.

Among the critical drawing and design specifications a customer should confirm are:

  • Set different colors for each ceramic PCB design layer. Of course, they should correspond to the
  • functional layers of ceramic PCB design
  • The front and back sections of the ceramic PCB
  • Arten von Durchkontaktierungen in Keramikleiterplatten
  • Various labeling requirements on ceramic PCB
  • Product cut line

Of course, the single product must also have a perspective view.

Then, it would be best if you marked the polarity.

In short, the customer should confirm every section of the drawing beside the mirror images patterns.

Evaluation should include both front and back sections of the product.

It may have a deviation in the tooling holes or cutting lines.

It is vital to make the necessary adjustments.

The customer confirms the drawing, the mirror image patterns on the front of the entire product and the back of the product can overlap, especially the customer tooling holes, single cutting lines, etc. If deviated, the adjustment is needed.

3.15 Focus Holes in Ceramic PCB Design

3.15 Focus Holes in Ceramic PCB Design

n the recent past, laser drilling has been popular for making ceramic PCB holes.

Of course, this is due to precision and accuracy.

For the four-pointing positioning, most manufacturers use round holes.

The distance between the positioning holes should be greater than 80mm (i.e., exposure lens distance).

Moreover, the positioning holes cannot be symmetrical right and left or up and down.

This prevents possible misalignment.

Of course, you cannot share holes for film alignment and solder masks.

For a product with a solder mask, you should have 8 alignment holes.

However, if the product does not have a solder mask, you can opt for 4 positioning holes.

Here, the size of these holes can vary from 0.1 to 0.15mm

3.16 Check Front and Back Layout

3.16 Check Front and Back Layout

As you evaluate the front and back layout of ceramic PCB design, you should not make any adjustments if there is overlapping.

Also, note that the mirrored patterns on both front and back sections can overlap.

3.17 Consider LOT Number

3.17 Consider LOT Number

Although most manufacturers use digits, say 5, others may use a series of numbers. This number plays an integral role when you want to trace a product.

Among the information, you can use as LOT number may include a combination of:

  • Date/month
  • Manufacturing order serial number
  • Rückverfolgbarkeitsnummer

During the production process, ensure the LOT number is consistent.

Of course, once you have everything mentioned in this guide, you can begin the actual PCB fabrication process.

For all your ceramic PCB designs, contact Venture Electronics now.

Nach oben scrollen