pcb inspection

EI Microcircuits performs multi-level PCB inspection using AOI, X-ray, and manual verification to ensure precision, quality, and compliance. Every board is carefully evaluated to meet the highest industry and customer standards.

Red graphic of a circle with radiating lines ending in circles, resembling a circuit.

optical inspection

Automated Optical Inspection (AOI) detects misalignments, solder defects, and component issues with high-speed imaging and accuracy.

Red graphic of a circle with radiating lines ending in circles, resembling a circuit.

x-ray inspection

X-ray inspection allows us to verify solder joints and internal connections beneath BGAs and other hidden components.

Red graphic of a circle with radiating lines ending in circles, resembling a circuit.

3D Solder paste inspection

We use 3D SPI to measure solder paste volume, height, and alignment—ensuring a strong foundation for reliable soldering.

Red graphic of a circle with radiating lines ending in circles, resembling a circuit.

ict testing

ICT verifies electrical performance, identifying shorts, opens, and component values to ensure every board meets functional specs.

Red graphic of a circle with radiating lines ending in circles, resembling a circuit.

functional testing

Our functional tests simulate real-world conditions to confirm final assemblies perform exactly as intended.

Red graphic of a circle with radiating lines ending in circles, resembling a circuit.

flying probe testing

Flying probe testing offers flexible, fixture-less validation—ideal for low-volume runs. EI’s in-line systems deliver fast, accurate diagnostics with streamlined efficiency.

certified excellence you can trust

Partner with EI Microcircuits—certified to the highest industry standards and trusted across medical, defense, and industrial markets for precision, quality, and compliance.

applications FOR pcb Inspection

medical

Our multi-stage inspection process ensures every medical PCB meets strict regulatory and quality standards.

industrial

We apply rigorous inspection protocols to validate durability and performance in high-load industrial applications.

energy

EI Micro’s inspection systems verify PCB reliability in energy environments where uptime is non-negotiable.

agriculture

We inspect every agricultural PCB for resilience and precision—so your equipment performs in any condition.

EI Microcircuits builds high-layer count, high-performance assemblies for the emerging AI market. Our advanced SMT and quality systems ensure reliable, complex builds for HPC applications.

aviation

Our aviation PCB inspection process is built on traceability, documentation, and flight-critical quality control.

military

Military-grade inspection protocols confirm every assembly meets mission-ready standards under the harshest conditions.

Security and Surveillance

We conduct thorough inspections to guarantee real-time performance and reliability in surveillance and security systems.

through-hole

Durable, high-reliability assembly for rugged and high-power applications.

inspection

Ensures precision, quality, and compliance at every production stage.

box build

EI offers a wide range of box build services including full electromechanical assembly.

overmolding

EI offers premolding and overmolding of a wide variety of materials in house.

potting

Protects electronics from moisture, vibration, and harsh environmental conditions.

our certifications

ISO 13485:2016 certified badge, AMTIVO logo, text "Medical Devices".
Logo for AMTIVO. ISO 9001:2015 Certified for Quality Management. Features a stylized "A".
A square badge with "AMTIVO" logo and "AS9100 D Certified Aerospace" text.
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hear it from our customers

"A delightful company to work with. Could not have done it without your expertise."

"EI excels in responsiveness, support and flexibility. I very much appreciate EI’s ability to adapt on the fly."

"I appreciate the work EI does most of all because it makes my job easier."

"Overall, EI does a great job in dealing with everything we throw at them. They are responsive and understanding of us, even though it may not always be the most reasonable of requests. As a buyer, I feel lucky to have a supplier that works with us like they do."

"Working on a project that had a board that was simply not manufacturable the way it was set up, EI went above and beyond to help with engineering and still met a very short deadline."

Two women working on circuit boards at a workbench. One is soldering. Black and white photo.

Electronic Insights

Circuit board components, calculator, pen, compass, tweezers, on circuit diagrams.

How to Design a PCB Layout

March 30, 2026
Learn pcb layout fundamentals and pcb layout design best practices for reliable manufacturing, guided by EI Microcircuits engineering expertise.
A person wearing gloves examining a circuit board in a lab setting.

PCB Troubleshooting Guidebook

March 26, 2026
Diagnose PCB failures faster with this guide from EI Microcircuits covering inspection, AOI/X-ray, ICT, functional testing, and root-cause analysis.
Close-up view of a blue stencil for printed circuit board assembly, with rectangular and square openings and small apertures.

Everything to Know About Solder Masks in PCBs

March 23, 2026
Learn what is a solder mask, pcb solder mask functions, materials, and design impact, with manufacturing insight from EI Microcircuits.

let's talk

EI Microcircuits operates multiple climate-controlled facilities designed for scalability, technical excellence, and built-in disaster resilience—each fully equipped to support today’s most advanced electronic assemblies. Let us be the solution to your next project—Contact Us, Request a Quote, or Schedule a Tour today!

Contact Us Today

MANKATO, MN

1651 Pohl Road
Mankato, MN 56001
P: 507.345.5786

ST. PETER, MN

2011 Klein Street
St. Peter, MN 56082
P: 507.934.5722

MANKATO, MN

69 Power Drive
Mankato, MN 56001

P: 507.386.9160

*Each facility is configured to support your production needs. While maintaining continuity with each other in equipment, training and process control. All facilities share the same data center to allow for seamless manufacturing between locations.