Multipin is the classification given by MDC to all ISI™ feedthrough products containing one or more conductor pins, which are also fitted with air or vacuum side threaded Circular Connectors.

多针电气穿通件包含一个或多个引脚的穿通产品，带有空气中或真空侧的螺纹连接器

Multipin Feedthroughs are commonly used for the transmission of electrical signals and/or low power applications. They are typically referred to as Instrumentation Feedthroughs, because of their use in instrumentation applications such as electron microscopy, surface analysis and semiconductor process controls.

多针电气穿通件通常用于传输电信号或者低功耗应用，常用于电子显微镜，表面分析和半导体过程控制等仪器类应用

Circular Connectors

Circular Connectors – 3 to 7 pins, were developed for applications requiring moderate pin density while maintaining relatively small package size. These products are fitted with dependable, screw type air side connectors.

MS Circular Connectors – 4 to 35 pins, were developed for similar purposes, but fitted with industry standard threaded connectors, which meet MIL-C-5015 specifications. These feedthroughs are offered with electrical ratings up to 1750 volts and 23 amps.

Type-C

Type-C – the latest addition to a comprehensive line of glass-ceramic, hermetically sealed instrumentation feedthroughs. This is a circular geometry 9 pin feedthrough designed for applications where space is at a premium or where conventional Subminiature Type-D connections will not fit. Its circular geometry allows the installation of this product into very small vacuum flanges including the popular 1.33″ Del-Seal^™ (DN16 CF) metal seal flange as well as K075 (NW16) elastomer seal quick-style KF flanges. Nine gold plated pins are hermetically sealed and electrically insulated in a stainless steel shell using the latest in glass-ceramic bonding technology. Subminiature-C air and vacuum side connectors are fitted with captured stainless steel socket head screws which provide a means of securely locking them to their mating feedthroughs. All in-vacuum connector screws are vented where required. The feedthroughs mating-screw boss doubles as a polarizing key. Air to vacuum pin positions are identified with a permanent surface indentation to facilitate the pin assignment operation. In-vacuum cables and connectors are not included with the feedthrough assembly and must be purchased separately.

Type-D

Type-D – subminiature feedthroughs are high density multipin instrumentation feedthroughs constructed with pin arrangements designed to meet MIL-C-24308 specifications. Nine, fifteen, twenty-five or fifty gold plated pins are hermetically sealed and electrically insulated in a stainless steel shell using the latest in glass ceramic bonding techniques. Each feedthrough assembly is supplied with an atmosphere side connector which requires customer wiring. Additional units may be purchased as stand-alone items. For vacuum side connections a Kapton^® insulated in-vacuum ribbon cable and PEEK material Type-D connectors meet the rigorous demands of UHV environments.

Intended Operating Conditions

Electrical ratings are safe operating limits. These ratings are determined by various factors, including dielectric strength, geometry and system operating pressure. Please note that all ISI catalog products are electrically rated for operation with one side in dry atmospheric conditions and the other side in a vacuum environment with a maximum system pressure of 1 x 10^-4 Torr. We advise that users make allowances for deviations from stated operating parameters and take adequate safety precautions when feedthroughs are operated at high voltages or high currents.

Ultrahigh & High Vacuum Series

MDC offers offers three standard vacuum mount styles: Del-Seal™; Kwik-Flange™; and Weldable. Additional configurations available upon request.

 Insulator Seal (ISI) brand catalog and custom engineered ceramic to metal seal products are manufactured to ISO 9001:2015 standard utilizing our qualified hermetic brazing and joining processes.