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The information presented in this cross reference is based on TOSHIBA's selection criteria and should be treated as a suggestion only. Please carefully review the latest versions of all relevant information on the TOSHIBA products, including without limitation data sheets and validate all operating parameters of the TOSHIBA products to ensure that the suggested TOSHIBA products are truly compatible with your design and application.
Please note that this cross reference is based on TOSHIBA's estimate of compatibility with other manufacturers' products, based on other manufacturers' published data, at the time the data was collected.
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Can photorelays be replaced with and used in the same way as mechanical relays? What is the difference, if any?

A mechanical relay consists of mechanical contacts, whereas a photorelay is a semiconductor contact consisting of MOSFETs for output. Because of the above, photorelays have the following benefits compared with mechanical relays:

  • 1.Free from contact wear and thus highly reliable (long life)
  • 2.Small, lightweight and easy to mount
  • 3.High-speed switching (several times faster than mechanical relays)
  • 4.Low power consumption: several mW (compared to approx. 100 mW for mechanical relays)
  • 5.Less bounce noise owing to the absence of mechanical contacts

However, there are disadvantages:

  • a.In contact resistance (ON-state resistance), the difference between metal and semiconductor is too large.
  • b.In the contact open/close capacity (ON-state current), for photorelays, the range that can be covered by one device is very limited.