Toshiba launches TLX9920 photovoltaic-output photocoupler for automotive BMS and solid-state relays
Category: Automotive, Battery Management Systems, Inverters, News, Power Electronics, Semiconductors
Toshiba’s TLX9920 photovoltaic-output photocoupler targets automotive BMS and industrial solid-state relay applications with 5000Vrms minimum isolation
(Image courtesy of Toshiba Electronics Europe GmbH)
Toshiba Electronics Europe GmbH has launched the TLX9920, a photovoltaic-output photocoupler designed to deliver isolated gate drive voltage for power MOSFETs without requiring a secondary-side power supply. Announced on 21st April 2026, the device targets automotive battery management systems, onboard chargers, inverters, and high-voltage subsystems, alongside energy storage systems and industrial power control equipment.
Why isolated gate drive matters for solid-state relay design
As automotive and industrial systems continue shifting from mechanical relays to solid-state relays, designers require reliable, highly isolated gate drive solutions that eliminate the need for secondary-side power supplies. The TLX9920 addresses this directly by generating gate drive voltage from its photovoltaic output, enabling simplified circuit design while maintaining reinforced isolation between control and power domains.
The device is optimised for driving high-voltage power MOSFETs in solid-state relay applications. When paired with external MOSFETs, it enables high-voltage, high-current switching that is difficult to achieve with conventional photorelays. Unlike mechanical relays, solid-state relays have no physical contacts, eliminating contact wear, reducing maintenance requirements, and improving long-term reliability.
TLX9920 photovoltaic-output photocoupler specifications and isolation performance
The TLX9920 is qualified to the AEC-Q101 automotive reliability standard, confirming its suitability for demanding automotive environments. It is housed in a thin SO6L package measuring 3.84mm x 10.0mm x 2.1mm, with a minimum creepage distance of 8mm and an isolation voltage rating of 5000Vrms minimum. These characteristics make it suitable for applications requiring reinforced insulation. Toshiba notes that IEC 60664-1 specifies that a creepage distance of 8mm may be required for systems operating at 400V or higher in pollution degree 2 environments, a requirement the TLX9920 meets.
An integrated discharge circuit simplifies design further and ensures reliable turn-off performance. Operating at a forward current of 10mA, the device provides sufficient gate drive capability for MOSFET control without the need for an additional isolated bias supply.
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