Mid-voltage range photorelays offer increased reliability

Posted By : Alice Matthews
Mid-voltage range photorelays offer increased reliability

Two new mid-voltage, high current photorelays have been launched by Toshiba Electronics Europe: the 100V TLP3823 with a 3A drive current, and the 200V TLP3825 with a 1.5A drive current. The new products will extend the range of large current photorelays to replace mechanical relays, alongside Toshiba’s current 60V, 5A TLP3547. Toshiba is supporting and promoting the accelerated replacement of mechanical relays by applying its latest trench MOSFET structure, 8th generation UMOS, to realise output currents exceeding 1A.

Unlike mechanical relays, photorelays have no physical contacts that incur wear and tear, contributing to significantly increased reliability. Photorelays are much smaller, thereby supporting the development of smaller and thinner products.

The new photorelays will be used in diverse applications including industrial equipment, inverters, HVAC equipment, building automation and semiconductor and other test equipment. In almost all cases they will be replacing mechanical relays.

Both devices offer an isolation voltage of 2,500Vrms and low values of on-resistance (TLP3823 60mΩ typ., TLP3825 250mΩ typ.) to ensure efficient operation. The rapid turn-on and turn-off times allow the photorelays to be used in fast switching applications. The required triggering current is below 5mA for both devices and, when off, the devices have a leakage current of less than 1μA.

Toshiba’s new devices offer a guaranteed pulsed ON-state current that is three times larger than the continuous ON-state current, securing a bigger margin for safety design.

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