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Toshiba Introduces 1-Form-B Photorelay

Toshiba Electronic Devices & Storage Corporation has released “TLP4590A,” a 1-Form-B (normally closed) photorelay in a DIP6 package featuring an industry-leading 1.2A increased ON-state current rating and a 60V OFF-state output terminal voltage rating.

ToshibaThe ON-state current rating of 1.2A is the highest in the industry, 140% higher than Toshiba’s current product, TLP4176A. 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


  • 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 ON-state current rating: ION=1.2A
  • Small package: DIP6
  • High operating temperature rating: Topr(max)=110℃

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.


Aishwarya Saxena

A book geek, with creative mind, an electronics degree, and zealous for writing.Creativity is the one thing in her opinion which drove her to enter into editing field. Allured towards south Indian cuisine and culture, love to discover new cultures and their customs. Relishes in discovering new music genres.

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