Photorelay With Inbuilt Protection Features

For greater reliability in electrically noisy environments

  • Photorelay With Inbuilt Protection Features
    Photorelay With Inbuilt Protection Features

Toshiba Electronics Europe has just released the first >1.4A-rated DIP4 package photorelay that has an OFF-state output terminal voltage of 80V, over temperature and over voltage protection functions. Photorelays integrate the functions of a photocoupler with an output MOSFET switch and are often used to replace mechanical relays. As solid-state devices there is no contact wear, they are silent in operation, small in size and require very little power to operate.

Alternative to mechanical relays

These devices are used in a wide variety of applications including building management, sensors, I/O interfaces, battery management systems and anywhere a mechanical relay can be used. Toshiba’s new TLP241BP photorelay is configured as 1-Form-A / normally open (NO) and is capable of a continuous on-state current (ION) of 1.4A and 4.2A (IONP) for pulsed operation. It offers an input-output isolation voltage (BVs) of 5,000 Vrms and is capable of operating at ambient temperatures between -40 °C and +110 °C.

For operation in electrically harsh environments

Inbuilt over temperature protection function inhibits the output MOSFET to protect against over current situations. Also, an active clamping MOSFET protects the device when an overvoltage exceeding the blocking voltage rating is applied. The inclusion of these protection functions makes the device suitable for use in environments with high levels of electrical noise such as industrial applications or air conditioning systems.
With comprehensive inbuilt protection and solid-state operation, the TLP241BP significantly contributes to the reliability of equipment in electrically harsh environments.