Tantalum Capacitors Potentials and Trends

by Tomas Zednicek Ph.D. European Passive Components Institute, EPCI Jan 19. www.passive-components.eu
1.      INTRODUCTION
Tantalum capacitors are offering excellent stability in high energy, harsh conditions, and power volumetric efficiency and low...Read More

Added passives capacity will help stabilise lead times, limit price increases

By James Carbone
However, it will remain a seller’s market in 2019 for many parts including MLCCs and resistors
Buyers of multilayer ceramic capacitors (MLCC), chip resistors and other passive components can expect supply to remain tight in 2019, although...Read More

Moderating outlook won’t slow industry momentum

By Victoria Kickham
Advancing technology and the digital economy will keep the electronics sector humming in 2019 and beyond, industry insiders say

Electronics industry leaders are maintaining a bright outlook despite predictions of moderating economic...Read More

Expect higher average prices for embedded processors

By James Carbone
Prices will rise because more higher-cost 64-bit embedded microprocessors will be designed into electronics equipment.

The global market for embedded microprocessors (MPUs) will grow about 5 per cent to $77.7 billion in 2018 because...Read More

Industry embraces strong outlook, laments tight labor market

By Victoria Kickham
Demand for labor heats up as 2018 comes to a close and the economy continues its solid pace.

Electronics industry companies will continue to reap the rewards of a strong US economy in 2019, but they will face accompanying challenges...Read More

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Conformal Coating and its Benefits to You

Conformal coating is a protective non-conductive chemical coating which can be applied to circuit boards. Its purpose is to protect the electronic circuits from damage due to contamination, salt spray, moisture, fungus, dust and corrosion caused by harsh or extreme environments.

By applying conformal coating, and electrically insulating your boards, it maintains long term surface insulation resistance (SIR) and ensures the integrity of your assemblies. Providing a barrier against contaminants and preventing corrosion. Coatings also help prevent damage from rough handling, installation, and reduction of mechanical and thermal stresses. It can also prolong the life of the product during its operation.

How does conformal coating work?

A protective barrier is applied to sensitive electronic components offering additional protection against the harsh environmental conditions that your product may face, such as moisture, chemicals, debris and vibration. They are not designed to be a total board sealant but offer a breathable protective layer.

Conformal coatings are typically used in defence, automotive and aerospace industries, where protection from moisture, aggressive chemicals and vapour, salt spray and mechanical vibration is critical. Conformal coating not only offers your product protection, but also enhances your products reliability, thus reducing potential future costs and failures.

Benefits of conformal coating:

  • Insulation, allowing reduction in conductor spacing
  • Reduce the need for complex, sophisticated enclosures
  • Minimal effect on component weight
  • Protection against chemical and corrosive attack
  • Improve performance and reliability of products subject to environmental conditions
  • Provide mechanical support and vibration resistance
  • Enhanced product reliability

Applying a conformal coating

Essentially there are 3 main ways to apply a conformal coating to protect your boards.

Dipping

Usually the highest volume technique. Boards are dipped in the conformal coating and coating penetrates everywhere. Masking in this application must be perfect to prevent leaking. Due to design, many PCB boards are unsuitable for this method, but if designed with conformal coating in mind then the ‘dipping’ process can be used in high volume manufacturing.

Brushing

Suitable for low volume manufacture, finishing and repairing units. Requires highly skilled operatives to get a suitable protection level.

Spraying

Coatings are applied with a spray aerosol or dedicated spray booth using a spry gun and is the most suitable method for low to medium volume manufacture. Most coatings can be applied this way.

After boards are conformal coated they will then need curing either by air dry, oven dry or UV light cure. Once the process of coating has been completed the coating is clearly visible as a clear and shiny material, some are hard while others have a slightly rubbery texture.

The team at 4e have been applying conformal coatings for nearly 20 years in military, medical and aerospace products. Meanwhile, Stock Electronics, which has produced motor control products for outdoor and harsh environments for 30 years, continues to use a range of conformal coatings across its product portfolio.

4e are exhibiting at eBOM LIVE, to make an enquiry and seek more information please click the button below

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