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Toshiba Starts Shipment of UL508 Certified Photorelays for Industrial Control Equipment

July 12, 2018

Toshiba Electronic Devices & Storage Corporation

UL508 Certified Photorelays
4pin SO6(left), DIP4(right)

TOKYO— Toshiba Electronic Devices & Storage Corporation (“Toshiba”) has obtained US safety standard UL508 certification for the following eight photorelay products: 4pin SO6 package series “TLP172GM”, “TLP176AM”, and “TLP3122A”; and DIP4 package series “TLP240A”, “TLP240D”, “TLP240G”, “TLP240GA”, and “TLP240J”.

These certified photorelays, all commercially available, can be used in industrial control equipment that requires UL508 certification, suiting them for use in a wider range of equipment marketed worldwide. The photorelays are also NRNT[1] certified.

The UL508 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 105ºC (upper limit)[2]. SSRs have to operate at temperatures up to the upper limit. By using our UL certified products, companies 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), thermostats, etc.)
  • Replacement of mechanical relays(AC24 to 400V system, DC24 to 125V system)


  • UL508 (NRNT) approved
  • UL1577 approved
  • Case temperature (max): Tc=105°C

Main Specifications


Package Absolute maximum ratings Trigger LED current IFT
ON-state resistance RON(Ω) Output capacitance COFF
Turn-on time tON

Turn-off time tOFF
OFF-state output terminal voltage
current (pulsed)
Case temperature Tc
Operating temperature Topr
typ. max
4pin SO6 350 0.110 0.33 105 -40 to 85 3 22 35 30 1 0.5
60 0.700 2.1 105 -40 to 85 3 0.15 2 100 3 0.5
60 1.4 4.2 105 -40 to 85 3 0.13 0.25 100 3 1
60 0.500 1.5 105 -40 to 85 3 0.6 2 130 3 1
200 0.250 0.750 105 -40 to 85 3 5 8 80 3 1
350 0.100 0.300 105 -40 to 85 3 25 35 30 2 1
400 0.120 0.360 105 -40 to 85 3 17 28 80 2 1
600 0.090 0.270 105 -40 to 85 3 30
40 75 2 1


[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 the new products and photorelays line-up.

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.

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