Littelfuse Reed Relays Offer Reliable Switching of AC and DC Small Signal to High Voltage Loads

Hermetically sealed switching solution for systems requiring no-leakage current, or operating in harsh environments requiring galvanic insulation

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Beijing, China Littelfuse introduced an expanded reed relay product portfolio that extends voltage capabilities to include AC ratings, supports AC or DC loads up to 300 Vdc, and provides input/output isolation voltage 2500 VRMS. These miniature reed relays are available in single In-line (SIL) and dual-in-line (DIL) packages.

HE3300, HE3600, and HE700 Reed Relays

Typical applications for the reed relays include position and speed sensing in a broad array of markets:

  • Security systems
  • Fire and safety
  • Instrumentation
  • Telecom
  • Automatic test equipment (ATE)
  • Process control systems

“The expansion of the Littelfuse reed relay portfolio is a reflection of our commitment to meeting our customers’ needs through technology and product development,” said Boris Golubovic, Vice President, Marketing and Strategy at Littelfuse. “Reed relays are uniquely suited for a wide range of applications, including process automation, and rapidly growing building technologies segment.”

The new reed relays offer these key benefits:

  • Capable of switching speeds up to 1 kHz and billions of operations.
  • Hermetically sealed switch contacts are unaffected by and have no effect on their external environment.
  • Lower power coil consumption than competing electromechanical devices.
  • Very low circuit board space requirement due to miniature DIL and SIL packages.
  • No leakage in the off state, making them an ideal choice for battery-powered devices.

How It Works

A reed relay combines a reed switch with a coil into one package to serve as a smaller, more power-efficient alternative to other types of relays. In comparison to solid-state relays (SSRs), reed relays 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.

Reed relays are used for switching of loads with up to 2500 V isolation between the low-voltage control signal and load circuit. 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. It is also well-suited for switching of analog signals in test and measurement, audio, and high-frequency applications.

For more information, please visit at Littelfuse.com.

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