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

May 11, 2021

Toshiba Electronic Devices & Storage Corporation

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

TOKYO—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


  • HVAC
  • 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℃

Main Specifications


Part number






Absolute maximum ratings

OFF-state output terminal voltage



ON-state current ION (A)


Operating temperature Topr (℃)

-40 to 110

Trigger LED current IFC max (mA)


ON-state resistance RON max (Ω)


OFF-state current IOFF max (μA)


Output capacitance COFF typ. (pF)


Isolation voltage BVS min (Vrms)


Turn-on time tON max (ms)


Turn-off time tOFF max (ms)


Sample Check & Availability

Buy Online

Follow the link below for more on the new product.


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:

Buy Online


Customer Inquiries:

Optoelectronic Device Sales & Marketing Dept.

Tel: +81-3-3457-3431


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

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