About COSEL

Since 1969, COSEL has been dedicated to delivering safe and efficient power solutions through technologies like switching power supplies and EMI filters.

What started in the aerospace industry has become essential for everyday electronics—from smartphones to medical devices and industrial equipment. We’ve grown alongside these innovations, always striving for products that are smaller, lighter, and more efficient, and we have worked hard to create solutions that customers can trust and use with confidence.

Our greatest strengths are high quality, proven reliability, and the flexibility to meet a wide range of customer needs.

And we’re not stopping here. We’ll keep pushing for new technologies and even better quality, bringing peace of mind and trust to customers all over the world.

01
Research & Development

COSEL is a technology-driven company where nearly 40% of our workforce is dedicated to research and development.
We specialize in innovative circuit design that seamlessly combines analog and digital technologies.
With a strong commitment to environmental responsibility,
we continuously push boundaries through exploration and challenge,
creating solutions that power the electronics of tomorrow.

Innovating for Market Needs

Our engineers actively visit customer sites to directly understand their needs, enabling us to accurately capture the evolving demands of the market. By swiftly incorporating this insight into product development, we create solutions that combine originality with practical functionality.

Integrated Design and Manufacturing

Our R&D and production teams work in close collaboration to transform ideas into reality quickly, while pursuing the highest quality standards. Every COSEL product is the result of a seamless integration of advanced technology and an uncompromising commitment to quality.

02
Technical Support

We’re here to help you solve challenges quickly and effectively.
Our skilled team combines deep expertise with hands-on experience to deliver dependable technical support.
By listening closely to your needs, we ensure fast and attentive service every time.

COSEL’s
Mindset

Up-to-Date Solutions

We stay on top of technology trends to provide the most suitable answers for your business.

Knowledge Sharing

From workshops to technical exchange sessions, we create opportunities to deepen
product understanding.

Quick Response

Our goal is to minimize
downtime and keep your operations running
smoothly.

A Trusted Partner

We aim to build long-term relationships that support your business growth.

COSEL’s Commitment

Delivering high-quality, responsive technical support
Continuously improving customer satisfaction
Providing flexible solutions to prevent business disruptions

03
Production System

We continuously embrace innovation in manufacturing to meet the ever-changing needs of the market.

Flexible Global and Domestic Production

Our products are made in Japan and at our Wuxi factory in China, ensuring we stay close to our customers and deliver solutions tailored to their requirements.

Value Beyond Expectations with Advanced Technology

We respond to diverse demands such as multi-variety, small-lot production, and short lead times, while also addressing miniaturization and high efficiency through our advanced technologies. By creating products that stand apart, we strive to deliver value that exceeds expectations.

Combines Flexibility and Productivity

While our approach is based on building each unit individually, we also pursue higher productivity and eliminate unnecessary processes and more efficient ways of working. Through systems that enable early problem detection, we are developing flexible production lines and sustainable factories that can adapt to change.

04
About Manufacturing Quality

We are committed to meeting the diverse needs of customers and partners worldwide by taking a global approach to manufacturing.
Since quality and technical requirements vary across countries and regions, we have established a production system that complies with the international IPC standards.
Our goal is to deliver high-quality products that you can use with confidence, wherever you are in the world.

What is IPC?

IPC (Institute for Printed Circuits) is a global industry association that develops standards for the manufacturing and assembly of electronic equipment. Today, more than 4,000 companies worldwide—across electronics, aerospace, automotive, and other sectors—follow IPC standards as a common benchmark for manufacturing quality.

Quality Initiatives

Our manufacturing practices are aligned with the IPC-A-610 standard, the internationally recognized benchmark for electronic assemblies. While our products may not fully conform to every detail of the standard, we use it as a key reference to guide our design and production processes.
We build our products in alignment with Class 2 or higher, based on application requirements, to deliver dependable performance and long service life.