JMT Inc.
Shaping the Future of Semiconductor Testing

Established in 1988 and based in Hidaka City, Saitama, Japan, JMT Inc. has carved out a strong reputation in the semiconductor testing sector. The company specializes in manufacturing test sockets and sheets, with a particular focus on the use of silicone rubber materials. These components play a crucial role in the post-assembly phase of semiconductor devices, where they are used to assess the performance and durability of chips.

At the core of JMT’s success is its ability to create highly customizable solutions for its clients. The company’s deep knowledge of silicone rubber allows it to produce components that deliver reliable performance even in the harshest testing environments, such as extreme temperatures.

This ability to adapt and meet clients’ specific needs has made JMT a trusted partner for some of the world’s leading semiconductor companies, including Samsung, SK Hynix, and Micron.

Offering Strong Balance of Cost Efficiency and Reliability

JMT’s flagship product, the pressure-type conductive contact sheet PCR^®, is a sheet-type contactor made primarily from silicone rubber. The use of silicone rubber enables stable electrical connections without damaging IC packages or test boards, making it well-suited for repeated use. PCR^® offers a strong balance of cost efficiency and reliability, making it ideal for testing a wide range of semiconductor package types.

PCR^® features a unique internal structure in which conductive particles are aligned vertically through the thickness of the sheet. When pressure is applied to the electrode area containing these particles, they come into contact with one another, forming multiple current paths. This structure ensures stable electrical properties and enables accurate, reliable measurements.

Additionally, PCR^® utilizes a planar contact structure, which provides a wide tolerance range for positional errors and can flexibly accommodate minor misalignments. Its ability to connect over very short distances also makes it ideal for testing high-end products that require high-frequency performance.
High-performance test sockets that incorporate the PCR^® sheet-type contactor support a wide range of applications—from fine-pitch, small ICs to large, advanced packages. The simple structure of PCR^® enables easy maintenance and user-friendly handling. Moreover, the socket’s pressure-application mechanism can be customized to match each customer’s product specifications and testing environment, with structural options including clamshell, double-latch, and screw-fixed types.

Taking a Customer-First Approach

JMT’s commitment to customer satisfaction is another cornerstone of its business. The company goes beyond simply selling products; it listens carefully to its clients’ needs and tailors its solutions to meet them.

As Moon Jeom Ju, CEO of JMT, puts it, “We place our customers at the center of everything we do and approach any challenge they face with sincerity and dedication, always striving to deliver effective solutions. This customer-first approach has allowed us to maintain strong relationships with our clients, offering reliable and cost-effective products.”

In addition to its commitment to customer satisfaction, JMT strongly emphasizes innovation. The company continuously invests in research and development to improve the performance and longevity of its test products. As semiconductor technology evolves, so do the challenges in testing these devices. For example, with the rise of AI and data servers, there is an increasing demand for testing high-performance, high-pin-count packages. JMT has responded to this challenge by developing new designs that accommodate the warping of larger packages, ensuring that test sockets remain reliable even under mechanical deformation.

Durability is another area where JMT excels. Silicone rubber, the primary material used in its test components, can permanently deform after repeated stress. To combat this, JMT has been exploring new materials that offer greater resilience under strain, which will help extend the life of its products and ensure they continue to meet the demanding standards of the semiconductor industry.

Providing Customers with the Best Testing Solutions Available

With 80 percent of its revenue coming from international markets, JMT has a global presence spans multiple regions, including Korea, China, Taiwan, and the U.S. The company works closely with its parent company, TFE Co., Ltd., to provide total test solutions that cover every phase of semiconductor testing, from development and evaluation to mass production. This partnership allows JMT to offer comprehensive solutions that meet the increasingly complex needs of the global semiconductor industry.

Over the years, JMT’s focus on quality, innovation, and customer-centric service has earned it significant recognition in the industry. In 2021, Samsung Electronics recognized JMT for its contributions to increasing productivity in its semiconductor mass production lines, a clear sign of the trust JMT has built with its clients. As the semiconductor industry continues evolving, JMT remains committed to staying at the forefront of innovation, providing its customers with the best testing solutions.

JMT’s success is driven by a simple yet powerful philosophy of delivering high quality at low prices, coupled with a dedication to meeting its customers’ unique needs. Through continuous innovation, a global network, and a customer-first approach, JMT is well-positioned to maintain its leadership in the semiconductor testing industry for years.