Toshiba’s 1-Form-B Photorelay Expands Applications With Industry’s Highest[1] ON-State Current Rating

May 12, 2021 11:10 KST

TOKYO--(Business Wire / Korea Newswire) May 12, 2021 -- Toshiba Electronic Devices & Storage Corporation (“Toshiba”) has launched “TLP4590A,” a 1-Form-B (normally closed) photorelay in a DIP6 package featuring an industry-leading[1] 1.2A increased ON-state current rating and a 60V OFF-state output terminal voltage rating. Volume shipments start today.

The ON-state current rating of 1.2A is the highest in the industry[1], 140% higher than Toshiba’s current product, TLP4176A[2]. The maximum operating temperature rating of 110℃ facilitates easy achievement of designs with the temperature margins required for application in heating, ventilation, and air conditioning (HVAC), security systems, and building automation system equipment, where many 1-Form-B relays are used. TLP4590A also features an isolation voltage (min.) of 5,000Vrms, allowing it to be used in equipment that requires high insulation performance.

[1] For photorelays (1-Form-B) where OFF-state output terminal voltage rating is 60V, according to a survey by Toshiba (as of May 11, 2021).
[2] 2.54SOP4 package


· Security systems
· Building automation systems
· Industrial equipment (Programmable logic controllers, I/O interface and various sensor control, etc.)
· Replacement of mechanical relays


· 1-Form-B
· Industry’s highest[1] ON-state current rating: ION=1.2A
· Small package: DIP6
· High operating temperature rating: Topr(max)=110℃

(To view the table, please visit

Follow the link below for more on the new product.
TLP4590A (

Follow the link below for more on Toshiba’s optical devices lineup.
Photorelays (MOSFET Output) (

To check availability of the new products at online distributors, visit:
TLP4590A (

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

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* 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, the company has taken its place among the leading general devices companies, and offers its customers and business partners outstanding solutions in discrete semiconductors, system LSIs and HDD.

Its 22,000 employees around the world share a determination to maximize the value of its products, and emphasize close collaboration with customers to promote co-creation of value and new markets. The company looks forward to building on annual sales now surpassing 710-billion yen (US$6.5 billion) and to contributing to a better future for people everywhere.
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Toshiba Electronic Devices & Storage Corporation
Media Inquiries
Chiaki Nagasawa
Digital Marketing Department

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