EMI Filter Connector – Frequently Asked Questions

What is an EMI filter connector?

An EMI filter connector is an electrical connector with integrated filtering components designed to reduce electromagnetic interference entering or leaving electronic equipment. By incorporating the filtering function directly into the connector, we can address unwanted electrical noise at the system interface rather than relying only on filtering components located elsewhere in the equipment.

How does an EMI filter connector work?

An EMI filtered connector combines the electrical connection with a filtering circuit that attenuates unwanted high-frequency noise. Depending on the application, different filter configurations and capacitance values can be selected. Our goal is to reduce EMI and RFI while maintaining the electrical and mechanical characteristics required by the system.

What is the difference between an EMI filter connector and a standard connector?

A standard connector primarily provides an electrical and mechanical interface between circuits or equipment. An EMI filter connector adds an integrated filtering function. This allows us to suppress unwanted electromagnetic interference directly at the point where signals or power enter or leave the enclosure, which can improve the overall EMC performance of the system.

What are the advantages of using an EMI filtered connector?

One of the main advantages is that the filtering function is integrated directly into the connector. This can save PCB space, reduce the need for separate filtering components and simplify the overall EMC design. At RF Immunity, we also see filtered connectors as an effective solution for existing equipment that requires improved EMI performance without a major system redesign.

What types of EMI filter connectors are available?

EMI filter connectors are available in many configurations for commercial, industrial, medical, military and aerospace applications. Our range includes filtered D-Sub connectors, Micro D-Sub connectors, circular connectors, MIL-DTL-38999 series, MIL-DTL-26482, MIL-DTL-5015, MIL-DTL-83723, ARINC connectors and feed-through filter solutions.

How do we select the right EMI filter connector?

Choosing the correct EMI filter connector depends on the specific electrical and mechanical requirements of the application. We consider factors such as connector family, number and type of contacts, voltage, current, required attenuation, frequency range, capacitance, filter configuration, termination method and environmental conditions. Understanding the EMI problem and the system requirements helps us determine the most appropriate solution.

Can an EMI filtered connector help equipment pass EMC testing?

An EMI filtered connector can be an effective part of a solution when equipment experiences conducted or radiated interference problems during EMC testing. Since the filtering is located at the system interface, unwanted noise can be attenuated close to the point where it enters or exits the enclosure. The actual solution should always be selected according to the frequencies involved, required attenuation and applicable EMC requirements.

Can we replace a standard connector with an EMI filter connector?

In many cases, this is possible. Certain EMI filtered connector configurations are designed as drop-in replacements for standard non-filtered connectors. This can make them particularly useful when an existing product needs improved EMC performance. Before recommending a replacement, we evaluate mechanical compatibility, electrical characteristics, filtering requirements and available installation space.

Are EMI filter connectors suitable for military and aerospace systems?

Yes. EMI filter connectors are widely used in military, aerospace and avionics applications where electromagnetic compatibility and reliable operation under demanding environmental conditions are important. At RF Immunity, our product range includes several military connector families as well as customized filtered connector solutions for specific system requirements.

Can we provide a custom EMI filter connector?

Yes. When a standard EMI filter connector does not meet the application’s requirements, we can develop a customized solution. At RF Immunity, we can adapt parameters such as connector configuration, filter topology, capacitance, electrical characteristics, mechanical dimensions and termination options. Our custom EMI filtered connector solutions are designed around the electrical, mechanical and environmental requirements of the customer’s system.