Toshiba Electronics Europe has launched the TLX9165T, an automotive-grade photorelay housed in a 10-pin SO16L-T package.
The component is designed to support battery management systems (BMS) for high-voltage, 800-V electric vehicle (EV) battery packs and battery energy storage systems (ESS). It provides an output withstand voltage of 1800V (min.), exceeding requirements for typical 800-V systems.
The transition to 800-V battery architectures in EVs is a key step toward reducing charging times and increasing vehicle range. To safely manage these higher voltages, BMS solutions require components with high insulation performance and electrical isolation.
Photorelays serve a critical role in isolating measurement and control circuitry from high-voltage battery domains. The TLX9165T addresses these needs by incorporating a high-voltage MOSFET that enables operation in systems requiring withstand voltages over 1600 V.
The device’s 10-pin SO16L-T package uses a resin with a Comparative Tracking Index (CTI) of 600 or higher, categorized under Material Group I in IEC 60664-1. Its pin configuration provides a creepage distance of 7.5mm or more on the light receiver side, supporting operation up to 1500V.
The footprint is also consistent with existing Toshiba SO16L-T photorelays (e.g., TLX9160T, TLX9152M), allowing for reuse of PCB layouts.
The TLX9165T is a normally open (1-Form-A) photorelay with an avalanche current rating of IAV = 0.6mA and a minimum isolation voltage of 5000Vrms. It’s AEC-Q101 qualified and compliant with IEC 60664-1, making it suitable for automotive and industrial applications.
Typical use cases include monitoring battery voltage, detecting stuck mechanical relays, and performing ground fault detection, functions that are increasingly critical in high-voltage EV battery platforms.
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