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Definitions for jargon, scientific terms and phrases used at Harwin and across the connector and electronics industries.

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See Ground

Electromagnetic Compatibility (EMC)

The correct operation of different equipment in a common electromagnetic environment, where interference may be an issue. Often controlled by standards in many countries, and covers both EMI and RFI effects.

Electromagnetic Interference (EMI)

Any undesirable disturbance in a current-carrying element caused by the external influence of an electric or magnetic field. It can cause a loss of signal integrity, potentially to the point of total disruption. It can come from both natural and man-made sources. Prevention is usually by some form of shielding to form a Faraday cage effect - by Board Level Shielding, braiding (as seen on coax cables), or total enclosure of a complete system in a metal shell. See also Electromagnetic Compatibility.

Electronic Connector

See Connector


Devices and systems involving the flow of electrons through electrical circuits, to control and modify the electron flow that enables electronic devices to function. Includes active components such as vacuum tubes, transistors, diodes, integrated circuits, optoelectronics, and sensors; passive components such as capacitors, resistors and inductors; and interconnect devices.


A subatomic particle, one of the fundamental particles of physics. Electrons orbit the nucleus of every atom. They have a negative charge (defined as one negative elementary charge), of the same magnitude but opposite charge to a proton (which is positively charged). However, its mass is only 1/1840 that of a proton. Electrons exhibit both wave and particle characteristics. The movement of electrons through a material or vacuum creates an electric current.

EN 9100

See AS9100


Also referred to by the acronym EOL. A product is said to be in the EOL phase if it is a) obsolete, but stock is still available, b) a Last Time Buy period has been announced and the product is therefore about to go obsolete, or c) firm plans are in place to declare the item as obsolete.

Epoxy Resin

A type of thermoset polymer that, when fully cured, forms a strong barrier or bond. These resins typically require either a catalyst or a co-reagent to commence the hardening or curing process to form a solid (they are supplied in liquid form). Most familiar to the consumer in two-part adhesives (such as Araldite®), these resins are also available as sealants and strong bonding materials, used for backpotting cable connectors.

Equipment Wire

See Cable

Evaluation Samples

Manufacturers may offer samples for customers to have a visual look at the product, which help with the total evaluation of whether the product is suitable for the required function. Customers should be aware that these samples may not have been manufactured using production tooling, or may have been stored in sub-optimal conditions. Therefore, for later prototyping and for any full-scale manufacturing, production items should be acquired, not evaluation samples. Evaluation samples are available from Harwin for many ranges on request.