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Bengaluru, NFAPost: Toshiba Electronic Devices & Storage Corporation (“Toshiba”) has launched three photorelays: “TLP3407SRA,” “TLP3475SRHA” and “TLP3412SRHA,” that are the industry-smallest voltage-driven photo relays with an extended operating temperature rating of 125°C.

Photorelays are semiconductor relays consisting of an LED optically coupled to a MOSFET and are used mainly as signal relay replacements. A photorelay or light-activated relay is a circuit which opens and closes the relay contacts according to the light. Having no movable contacts, photorelays are known to have better long-term reliability than mechanical relays.

Toshiba: new photorelay TLP3407SRA in S-VSON4T package with industry's smallest mounting area. (Photo: Business Wire)

Toshiba: new photorelay TLP3407SRA in S-VSON4T package with industry’s smallest mounting area. (Photo: Business Wire)

Raising the maximum operating temperature rating from 110°C to 125°C allows the photorelays to be mounted in high temperature areas, and makes it easier to secure required temperature design margins for equipment.

The S-VSON4T package has the industry-smallest mounting area of 2.9mm² .This will contribute to reducing PCB size or to increasing the number of photorelays in an existing layout in applications such as semiconductor testers, probe cards and other devices.


  • Semiconductor testers (memory, SoC and LSI, etc.)
  • Probe cards
  • Burn-in equipment
  • Measuring instruments (oscilloscope, data logger, etc.)


  • S-VSON4T, the industry’s first[1] packaging with a minimal mounting area and maximum operating temperature of 125°C: Mounting area 2.9mm2 (typ.)
  • Low input power consumption drive: 3.3mW[2] (max) @VIN=3.3V (TLP3407SRA)

Main Specifications

Part numberTLP3407SRATLP3475SRHATLP3412SRHA
Size typ. (mm)2.0×1.45
Height typ.(mm)1.3
Applied input forward voltage  VIN typ. (V)
Built-in resistance typ. (Ω)4000600600
Absolute maximum ratingsOFF-state output terminal voltage VOFF (V)606060
ON-state current ION (A)10.40.4
ON-state current (pulsed) IONP (A)31.21.2
Operating temperature Topr (℃)-40 to 125
Limited LED current ILIM(LED) max (mA) (@VIN)1
Trigger LED current IFT max (mA)0.222
Operating voltage  VFON max (V)333
ON-state resistance RON max (Ω)
Electrical characteristicsOutput capacitance COFF typ. (pF)801220 (max)
OFF-state current IOFF max (nA)  (@VOFF)1   (@50V)1   (@50V)1   (@50V)
Switching characteristicsTurn-on time tON max (ms)200.50.5
Turn-off time tOFF max (ms)10.20.2
Isolation characteristicIsolation voltage BVS min (Vrms)500500500
Sample Check & AvailabilityBuy OnlineBuy OnlineBuy Online

[1] For photorelays where maximum operating temperature rating is 125°C, according to a survey by Toshiba (as of August 25, 2020).
[2] Applied input forward voltage × maximum limited LED current=3.3V×1mA

Follow the link below for more on the new photocouplers.



Follow the link below for more on Toshiba’s photorelay lineup.

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

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 24,000 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 750-billion yen (US$6.8 billion) and to contributing to a better future for people everywhere.

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