Custom circuit board design, PCB & MCPCB Circuit Board Design Rules – Best Technology

The design of a special circuit board is the process of making a PCB layout designed to meet the needs of certain projects. Unlike solutions outside the shelf, a special PCB gives you full control over size, shape, pile of layers, stomach, and component placement. Whether you are building that can be used, strong industrial devices, or special automotive controllers, special layouts help improve the performance and efficiency of space.

Who needs a special circuit board design?

Special circuit boards are very important for engineers, startups, hardware developers, and OEMs that cannot rely on generic PCBs. If you design a unique product or work with an unusual form factor or power needs, a special design is one of your choice. This includes industries such as:

• Medical devices that require miniature and high reliability circuits.
• Automotive and aerospace systems that require coarse Multilayer PCB.
• Consumer electronics developers who are looking for a sleek and compact design.
• Industrial automation and control system.
• The research and development team created prototypes.

In short, if your project demands specific functions, form factors, or performance that cannot be given a standard PCB, it’s time for special solutions.

Circuit Board Design Rules

The design rules form the basis of the design of reliable special circuit boards. They are not only about fulfilling the DRC check but make sure your board works properly in the field. Here are the most important and professional level design constraints to follow:

1. Minimum trail width and distance:

For standard 1 oz copper (35îief), a minimum trail width of 6 million (0.15mm) is generally used for signal channels. Power traces may require 10- 20 miles or more, depending on at this time. Use the IPC-2221 or online calculator graph to determine the width based on current (for example, a trail of more than 1oz copper usually requires 15 million for internal layers, 10 million for the outer layer).

2. Minimum distance:

Standard fabrication allows a distance of 6 miles, but for HDI design or high voltage isolation, using a wider distance. IPC-2221 recommends a distance of 63 million (1.6mm) for 250V isolation.

3. Through the size and ring of Annular:

Via typical uses 0.3 mm drill with a cushion size of 0.6 mm, leaving an annular ring 0.15 mm. For HDI, microvias can be as small as 0.1 mm.

4. GND aircraft design:

Always use a sturdy land area on the internal layer. For multi-layer boards, dedicate one layer (often the second layer) as a continuous GND field to reduce EMI and support the current return pathway. For analog and digital mixture signals, separate analog GNDs and digital GNDs, and connect at one point near ADC/DAC.

5. High -speed signal rules:

Use controlled impedance for differential pairs and high -speed single paths. Maintain long mismatch for differential pairs in ± 5 miles, and the distance between the pair must be 2 ‘3 times the width of the trail.

6. Creepage and Clearance:

Follow the standard IPC-2221 for high voltage boards. For example, for 240V AC, you need a minimum distance of 3.2mm between conductors.

7. DRC and Design Check:

Always determine your DRC settings based on your manufacturer’s capabilities. Most producers support 4/4 miles (traces/space) in the standard process, but 6/6 million more commonly used for endurance.

How do you arrange your DIY circuit board?

Filtering your special PCB starts with a strategy. A great scheme will not store bad layout, especially for fast signals or complex systems. This is the SA professional approach for DIY or low volume layout:

1. Start with a block floor floor plan:

Divide your circuit into several parts (Power, MCU, Analog, RF, Connector) and place it logically. Keep the high -speed signal short and isolated from analog traces.

2. Place the capacitor decoupling cap:

Each IC power pin must have a 0.1îieff ceramic capacitor placed in 1â € “2 mm from the PIN, with a short path to the land plane.

3. Use Polygon Pours for GND:

Instead of reaching the GND footprint, pour a solid copper polygon for GND connection. Make sure the polygon is bound to the right soil nets and has enough VIAS to connect to the internal GND field (1 through per 1â € “2 cm ² Area is a good rule).

4. Signal layer planning:

On the 4-lapi board:

• Upper layer: signals and components
• 2nd layer: Solid GND aircraft
• 3rd layer: Plane Power
• Lower layer: secondary signal

This gives you a clean return path and effective power distribution.

5. Controlled impedance routing:

For USB, HDMI, Ethernet, and RF signals, match impedance (usually 50î © single differential or 100î ©). Use your PCB software impedance calculator or external tools such as the Saturn PCB Toolkit. Factors include traces, dielectric height, and copper thickness. For example, microstrip 50î © more than 1.6mm fr-4 (îμr = 4.2) may require a trace width of 12 miles more than 10 million height.

• Differential pair routing:
• Maintain the same length (suitable with ± 5 miles).
• Maintain a consistent distance.
• Avoid 90 ° bend â € ”Use two bends or arcs 45 °.

6. Avoid isolated stubs and copper:

Copper or hanging trail that is not used can act as an antenna. Remove them to reduce Emi.

7. Thermal Belief and Copper Balance:

For hole bearings connected to GND or power plane, use the thermal relief to help the soldering. Also, make sure the copper is balanced in all layers to avoid warping.

PCB Design Software

You cannot design special boards without the right software. Depending on your experience and budget, here are some options:

• Kicad (free, open-source): Ideal for beginners and hobbies. Offering schematic capture, PCB layout, and 3D visualization.
• Eagle (free for students and small projects): good integration with Fusion 360 and supports complex design.
• Altium Designer: Industrial Standards for advanced features such as high -speed routing, simulations, and collaboration tools.
• Easya (Cloud -based): Good for fast and integrated prototypes with fabrication services.
• ORCAD/PADS: often used in a professional environment for complex multilayer boards.

Choosing the right tool depends on the needs of your project, from a simple prototype to multilayer, a ready-production board. Here are 10 top PCB design software commonly used by engineers.

Consideration during designing a special circuit board

Designing a special PCB is not about making connections – it is a balance of balancing between performance, costs, and manufacturing. This is what must be considered:

• Size and shape of the board: compact design can save space but more difficult to be mounted.
• Number of layers: multilayer boards improve performance but increase costs.
• Availability of components: Choose an easy to establish and compatible parts with your assembler equipment.
• Thermal management: use heat sink, thermal Vias, or pour copper to manage heat.
• Manufacturing Ability: Make sure your design matches your fabrication limit for the width of the trail, hole size, and pile.
• Testing and debugging: Leave space for test bearings, headers, or diagnostic LEDs.

Wise planning during the design phase saves time and avoiding problems during production.

Where can I get a special circuit board?

You can order a special circuit board from online PCB manufacturers or local fabrication stores. Some popular platforms include:

• JLCPCB
• PCBway
• Sierra Circuit

However, if you are looking for a very reliable PCB solution that is very reliable with fabrication and assembly services, it is better to work with professional companies that understand the full production life cycle.

The best technology is your trusted partner for design, manufacturing, and special circuit board assembly. With ISO9001, IATF16949, ISO13485, and AS9100D certification, we follow a strict quality system to ensure that your project meets industrial standards. Below are some of the advantages that the customer is why choosing us:

• Full customization for one -sided board, multilayer, ceramics, metal core, and HDI.
• Advanced technical support from scheme to layout optimization.
• Fast prototype with 24/7 customer service and timely delivery.
• Tracking with the mes system, includes every step of the process for your mind.
• Competitive prices without reducing quality.

Whether you are a startup to build a prototype or production of the Fortune 500 company, we are here to support every step of your trip.

Contact us now to get a free design offer or consultation.

FAQ

1. What file format is needed to create a special PCB?

You usually need Gerber, CAD, Bomb (Bill of Material) files, and Pick-and-Place files for assembly.

2. How long is the time for making a special PCB?

Depending on complexity and quantity, fabrication can take 3-7 days, with assembly adding 2 more days. Accelerated services are available.

3. Can I get a special PCB in small amounts?

Yes. Many producers, including the best technology, support running low volumes and prototypes.

4. Is PCB design specifically expensive?

Costs depend on the complexity of the board, number of layers, and completion time. Simple design is very affordable today.

5. Do you help revision PCB design?

Most technology, yesâ € “we offer design assistance and layout reviews to ensure your files are ready to be produced.