FAQ // Military and Aerospace PCBs

PCB Certifications

What industry certifications does Sierra Circuits have to manufacture mil-spec PCBs?

Sierra Circuits has the following industry certifications:

• ISO 9001:2015 Certificate
• ISO 13485:2016 Certificate
• AS9100
• UL Certified
• IPC-A-600 Inspectors
• Defense Logistics Agency (DLA) Approval Letter
• IPC Manufacturers Qualification Profile (MQP) for Sierra Circuits, Sunnyvale, California
• ITAR Registration Letter
• Minority Business Certification
• MIL-PRF-31032 Certificate
• Mil-PRF-55110 Certificate for GF Materials
• Mil-PRF-55110 Certificate for GI Materials
• RoHS / REACH Compliance Material Composition Declaration
• Conflict Minerals Reporting Template

For more information about our certifications, click here.

Documentation

What documentation is provided with each mil-spec PCB?

We provide all the military-grade documents. The following is the list of documents that we will provide for your mil-spec board:

• Certificate of conformance
• IPC J-STD-001E
• Material specifications
• Record of calibrated tools used during manufacturing
• Reflow profile copy (included with first article)
• AOI report or visual inspection report
• Photo requirements
• Flying probe or in-circuit testing report
• First article inspection report
• Ionic cleanliness test report

Dielectric

What is the minimum dielectric between two planes?

The minimum dielectric between two planes is 3 mils.

Annular Rings

What is the minimum annular ring on finished boards?

The minimum annular ring on finished boards is 2 mils.

What are the annular rings for inner and outer layers in the working Gerbers?

In your Gerber files, you should have a minimum annular ring of 6 mils for inner layers and 7 mils for outer layers.

Hole Size

What is the minimum plating inside the hole (PTH)?

The minimum plating inside the hole is 1 mil.