Military and aviation PCB are often subject to harsh environmental conditions, including elevated/fluctuating temperatures, extreme humidity and humidity. Moreover, they are often exposed to harsh chemicals, hydrocarbon solutions, dust and other pollutants. Only PCB assembled from the highest quality materials manufactured using correct manufacturing methods can withstand harsh conditions in military and aerospace applications.

How to design military and aviation PCBS

Compared to standard boards, PCBS mean that military and aerospace applications require special processing in design, manufacture and assembly.

When assembling PCBS for military and aviation applications, additional features must be incorporated. Some of these include:

L Use heat dissipating agent when necessary.

L Add additional shielding and grounding to critical wiring.

L Coat PCBS with a high quality acrylic spray to protect them from corrosive environments.

Use components with military specifications rather than commercial grade components.

L Use appropriate terminating techniques.

L Carefully select materials and components to withstand high temperatures. These include Pyralux AP, epoxy laminates (e.g. FR408) and various metal core materials.

L Use extremely reliable finishing materials to enhance protection in harsh conditions. The most common decorative materials used in military and aviation PCB assembly include:

n ENIG

Electrolysis of nickel and gold

n ENEPIG

N lead-free HASL

N leaching silver

N Electrolytic wire weldable gold

N is

N heavy gold

N gun

L Produces military and aviation grade PCBS conforming to mil-PRF-31032, MIL-PRF-50884 and MIL-PRF-55110 standards.

L Please verify bending strength, bond strength, wire width, thickness, resolution, thickness of protective coating and dielectric thoroughly before shipment. Make sure you are ready to use them in harsh industrial environments.

Maintaining quality and durability is critical when designing military and aviation grade PCBS. A PCB failure can seriously affect the functionality of the application and thus the success of the overall mission.