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Toshiba Starts Shipment of UL 508 Certified Photorelays for Industrial Control Equipment

News provided by Toshiba Electronic Devices & Storage Corporation
May 23, 2019 10:15 KST

TOKYO--(Business Wire / Korea Newswire) May 23, 2019 -- Toshiba Electronic Devices & Storage Corporation (“Toshiba”) has obtained US safety standard UL 508 certification for the following nine photorelay products: DIP4 package series “TLP3556A,” “TLP3558A” and “TLP241A;” and DIP6 package series “TLP3543A,” “TLP3545A” and “TLP3546A;” and DIP8 package series “TLP3547,” “TLP3548” and “TLP3549.”

These certified photorelays, all commercially available, can be used in industrial control equipment that requires UL 508 certification, suiting them for use in a wider range of equipment marketed worldwide. These photorelays are also NRNT[1] certified.
The UL 508 standard includes stringent standards for parts. Solid state relays (SSR) are one such category of parts, and the resin temperature within an SSR is restricted to 105 ºC (upper limit) [2]. SSRs can be operated at temperatures up to the upper limit.
By using Toshiba UL certified products, users can manufacture control equipment compliant with the UL standard and maintain the thermal design margin required for SSRs.


· Industrial equipment (PLC, I/O interface, various sensor control, etc.)

· Building automation systems (heating, ventilation, and air conditioning (HVAC), thermostat, etc.)

· Replacement of mechanical relays (AC24 to 400V system, DC24 to 125V system)


· UL 508 (NRNT) approved

· UL 1577 approved

· Case temperature (max): Tc=105℃

Main Specifications (To view the table, please visit

[1] UL product category: Industrial control switch, solid-state control equipment for non-motor-rated loads
[2] Temperature restriction for plastics (epoxy)
[3] Surface mount option available.

Follow the link below for more on Toshiba photorelay line-up.

To check the availability of the new product at online distributors, please visit:

*Company names, product names, and service names may be trademarks of their respective companies.

Customer Inquiries:
Optoelectronic Device Sales & Marketing Dept.
Tel: +81-3-3457-3431

Information in this document, including product prices and specifications, content of services and contact information, is current on the date of the announcement but is subject to change without prior notice.

About Toshiba Electronic Devices & Storage Corporation

Toshiba Electronic Devices & Storage Corporation combines the vigor of a new company with the wisdom of experience. Since becoming an independent company in July 2017, we have taken our place among the leading general devices companies, and offer our customers and business partners outstanding solutions in discrete semiconductors, system LSIs and HDD.

Our 22,000 employees around the world share a determination to maximize the value of our products, and emphasize close collaboration with customers to promote co-creation of value and new markets. We look forward to building on annual sales now surpassing 800-billion yen (US$7 billion) and to contributing to a better future for people everywhere.
Find out more about us at

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Toshiba Electronic Devices & Storage Corporation
Digital Marketing Department
Chiaki Nagasawa

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