Toshiba Electronic Devices and Storage Corporation has released a new photovoltaic-output photocoupler designed for use in solid state relays (SSR) within automotive equipment. Volume shipments of the TLX9920 have begun.
The component is housed in a thin SO6L package with a long creepage distance, targeting applications where high isolation voltage and compact form factor are required.
The release comes as the automotive industry moves increasingly toward solid state relays in place of traditional mechanical relays. SSRs have no physical contacts, which eliminates contact wear and reduces the need for regular maintenance – a characteristic that supports the growing demand for longer-life relay units in vehicles.
As automotive electrical systems become more complex, particularly with the rise of battery management systems, onboard chargers and inverters, the shift toward SSR is expected to continue.
The TLX9920 is designed to function as a gate driver for high-voltage power MOSFETs used in SSR applications. When combined with a high-voltage power MOSFET, it can achieve high-voltage, high-current switching that photorelay components alone cannot deliver.
The device is housed in an SO6L package measuring 3.84 x 10.0 x 2.1 mm, with a creepage distance of more than 8 mm. This enables a high isolation voltage rating of 5,000 Vrms.
Toshiba noted that the IEC 60664-12 international standard requires a creepage distance of 5.6 mm or more for applications in environments with pollution degree 2 and an operating voltage of 400V or above. The TLX9920 exceeds this requirement.
The component is qualified to AEC-Q101, the reliability standard for automotive electronic components.
The TLX9920 operates across a temperature range of -40 to 125 degrees Celsius. It delivers an open voltage of 13.5V minimum and a short-circuit current of 8 microamps minimum at an input forward current of 10 mA.
Turn-on time is rated at 0.6 ms typical with a 1.0 ms maximum, while turn-off time sits at 0.1 ms typical with a 1.0 ms maximum. The trigger LED current is rated at a maximum of 3 mA.
While the primary target is automotive equipment, including battery management systems, onboard chargers and inverters, Toshiba also positioned the TLX9920 for use in energy storage systems and industrial power equipment.
The company described the component as suitable for high-voltage systems and harsh environmental conditions across a range of switching applications.
Toshiba Electronic Devices and Storage Corporation develops semiconductor and storage products including discrete semiconductors, system LSIs and HDD products. The company employs approximately 17,000 people worldwide.
Last Updated on March 18, 2026 by Nick Ross
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This article was written by a member of SMBtech’s staff.
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