Semiconductor Review: Specials Magazine

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 pressureapplication 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 Approac 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.