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Evaluation board available for photorelay designs

With modern designs being integrated into ever smaller, more compact housings, design engineers are often left wondering how to replace the tried and trusted mechanical relay with something more compact. Just as solid-state circuitry has replaced incandescent lightbulbs and radio valves, dedicated devices known as photorelays now provide an alternative to the traditional mechanical relay. Being solid-state they are not susceptible to vibration, have no contact bounce, and remain reliable even in dirty and dusty environments. They integrate more simply with common control circuitry, such as microcontrollers and microprocessors, since they operate at voltages much lower than the more traditional 24 V, 12 V, or even 5 V of their forbearers.

No design engineer would swap out one component for another without checking its suitability under all relevant operational conditions. With the move to photorelays the swap is slightly more complex since the characteristics of a mechanical relay differ significantly from the solid-state alternative: it is a completely different component. To help engineers with this switch to photorelay technology, Toshiba have developed a drop-in replacement evaluation board. Offering a common footprint, standard amongst many mechanical relays, it allows developers to trial photorelays without having to make significant changes to their printed circuit board (PCB), making initial evaluation simple and trouble-free.

Based upon the TLP3107, the board is offered in an SOP6 design. This supports a VOFF of 60 V and an ION of 3.3A at room temperature. As well as the evaluation board, Toshiba has also prepared a range of informative videos together with a “Photorelay eBook” to download. Inside this comprehensive document all the aspects of photorelays are covered in detail, providing a valuable resource to those contemplating the mechanical to photorelay move.

To order your photorelay evaluation board, or to download our Photorelay eBook, take a look at our resource page available here:

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