New photorelay features achieve greater reliability in electrically noisy environments

Toshiba Electronics Europe GmbH has released the first >1.4A-rated DIP4 package photorelay with an OFF-state output terminal voltage of 80V, over temperature and over voltage protection functions.

Photorelays combine the functions of a photocoupler with an output MOSFET switch and are often employed to replace mechanical relays. As solid-state devices have no contact wear, they are silent in operation, small in size and need very little power to operate.

These devices are employed in various applications, including building management, sensors, I/O interfaces, BMS and anywhere a mechanical relay can be used.

The company'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 provides an input-output isolation voltage (BVs) of 5,000Vrms and can operate at ambient temperatures between -40C and +110C.

The 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. Including these protection functions makes the device appropriate 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 device greatly contributes to equipment reliability in electrically harsh environments.

The device holds UL and eUL recognition, along with VDE approval.