Reed relays are hermetically sealed for high voltage galvanic insulation

Hermetically sealed reed relays have been added by Littelfuse to its portfolio. The miniature reed relays are designed for systems which require no-leakage current, or which operate in harsh environments requiring galvanic insulation.

The HE3300 and HE3600 single in line (SIL) and HE700 dual in line (DIL) reed relays are capable of switching speeds up to 1kHz and billions of operations, says Littelfuse. The SIL and DIL packages also minimise circuit board space requirements, adds Littelfuse.

The reed relays have lower power coil consumption than competing electromechanical devices and minimise circuit board space requirements due to miniature DIL and SIL packages.

Boris Golubovic, vice president, marketing and strategy at Littelfuse, says: “Reed relays are uniquely suited for a wide range of applications, including process automation, and rapidly growing building technologies segment.”

One of the benefits of a reed relay is that it combines a reed switch with a coil into one package to serve as a smaller, more power-efficient alternative to other types of relays. Unlike solid state relays, they provide no leakage current and higher robustness against transient spikes. Reed relays also have a much longer life, smaller size, higher switching speeds, and lower power consumption than electromechanical relay switches, adds Littelfuse.

Reed relays are used for switching of loads with up to 2500V isolation between the low voltage control signal and load circuit.

The reed relays come in a hermitically sealed miniature package and offer full galvanic (zero leakage current) load disconnect that provides the high reliability needed in harsh environment applications to switch AC/DC signals and loads. They are also well-suited for switching of analogue signals in test and measurement, audio, and high-frequency applications.

No leakage in the off state, makes the HE33, HE3600 and HE700 reed relays particularly suitable for battery-powered devices. Typical applications include position and speed sensing in security systems, instrumentation, telecomm, automatic test equipment (ATE), process control systems and fire and safety systems. 

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