Introduction
Board level shielding involves applying conductive materials over an entire circuit board to shield components within the same circuit from EMI/RFI. This strategy has become more common as circuits have become smaller and more dense, making traditional solutions like reverse winding unfeasible. In other circumstances, only a single component needs isolation, known as package level shielding, where a conductive material is applied over a single component to prevent EMI/RFI. Electrically conductive paint presents a quick and cost-effective solution to achieving both board and package level shielding when compared to other methods like canning or stamping. Further, these paints can be used as electrically conductive coatings over silicon wafer for component fabrication, replacing sputter coating which is comparatively expensive and time-consuming. In this guide, we’ll explore everything you need to know about conductive coating options for board level shielding — To learn more about MG Chemicals’ innovative board level shielding solutions, click here.
Features of Conductive Coatings used for Board Level Shielding
Some of the key features of a conductive paint used for board level shielding are high conductivity, high flexibility and low film build. Silver conductive paints have the required conductivity to make them a viable option when board level shielding is needed.
Key Properties:
- High Conductivity: Provides sufficient shielding against EMI/RFI
- Versatile Application: Can be applied locally to single components or over entire circuit
- Low Film Build: Conductive at film builds as low as 7 microns
- High Flexibility: Can be machined after curing without chipping or cracking
When are Board Level Shielding Coatings Used?
Package Level Shielding
In package level shielding, single components within the circuit board like chips and ICs are coated with a conductive layer to isolate them from any EMI/RFI locally within the circuit.
Board Level Shielding
In board level shielding, circuit boards are first coated with a dielectric barrier to prevent short circuiting followed by a layer of electrically conductive paint to prevent EMI/RFI between components on the same circuit.
Component Fabrication
Highly conductive coatings can be applied directly onto silicon wafers where they can later be processed and machined into components. Conductive coatings offer an alternative over sputter coating which is a lengthy and costly process.
Advantages of Conductive Coatings for Board Level Shielding
Ease of Use – Compared with other processes like canning or stamping, localized application of conductive coating is quick and robust requiring little expertise.
Lower Cost – Conductive coatings can be applied quickly allowing for a higher throughput over other processes and subsequently lower costs
How to Apply Conductive Paint for Board Level Shielding
Surface Preparation
– Clean the surface thoroughly to remove dust, oils, or debris.
– Some substrates such as polyolefins may require use a primer to improve adhesion.
Application Methods
– Brush-On: Ideal for small areas or detailed work.
Manual Spray
– Provides uniform coverage for larger surfaces with minimal setup or expertise required.
Automated Spray
– Ideal where high throughput is required, negates the need for masking.
Board Level Shielding
– An insulating layer MUST first be applied over the circuit board to prevent short-circuiting. Contact support to discuss further.
Drying and Curing
– Please refer to the product technical data sheet for information on how to properly cure the conductive coating.
Testing Conductivity
– Use a multimeter to verify electrical performance and ensure the desired conductivity is achieved.
Tips for Optimal Results
- Apply in thin, even layers for consistent conductivity.
- Avoid common mistakes like insufficient surface preparation or applying overly thick coats.
MG Chemicals’ Conductive Paints for Board Level Shielding
MG Chemicals offers a diverse range of conductive paints for board level shielding using a highly engineered silver flake. These products are available in liquid format.
Silver
- 842ARL – Super Shield Silver Conductive Coating – a single-component acrylic silver conductive coating that can be cured at room temperature. This coating is highly conductive even at film builds of 10 microns.
- 842ER – Super Shield Silver Epoxy Conductive Coating – a 2-component epoxy silver conductive coating with excellent chemical resistance.
- 842UR – Super Shield Silver Conductive Coating – a single-component polyurethane silver conductive coating that can be applied as thin as 7 microns, reducing cost and weight.
Why Choose MG Chemicals?
- Industry Leadership: With 70 years of experience, MG Chemicals is a trusted name in the electronics industry, specializing in high-quality chemical products.
- Comprehensive Product Line: A wide range of conductive paints designed to meet diverse application needs, from DIY projects to industrial solutions.
- Global Availability: MG Chemicals products are distributed worldwide, ensuring easy access for customers across North America, Europe, Asia, and beyond.
- Exceptional Support: Dedicated technical and customer service teams offer personalized assistance and expert guidance to ensure successful outcomes.
- Commitment to Innovation: Continuous investment in research and development drives the creation of advanced, reliable solutions tailored to industry needs.
Conclusion
Conductive paints for board level shielding offer convenience over traditional shielding methods while not sacrificing performance and durability. Explore MG Chemicals’ range of conductive paints for board level shielding to find the perfect solution for your project.
Contact us today or visit our Conductive Paints for board level shielding product page to learn more!
