A new photorelay designed for 800 V battery management systems offers 1800 V isolation, fast switching, and compact reliability, enabling safer and more responsive operation in electric vehicles and energy storage applications.
Toshiba has launched the TLX9165T, a high-voltage photorelay designed for 800 V battery management systems (BMS) in electric vehicles and energy storage applications. The device stands out with a peak off-state voltage of 1800 V, surpassing typical 1600 V solutions, and supports a maximum ON-state current of 30 mA with ON-resistance up to 340 Ω for short durations. Its optically coupled LED-to-photoMOSFET design enables contactless switching, eliminating mechanical wear while providing robust insulation and fast switching.
The key features are:
- Rated for 5000 Vrms isolation
- Creepage and clearance distances ≥ 8 mm
- Insulation thickness: 0.4 mm
- Ensures safety under transient conditions
- Complies with automotive standards
The device’s 1 ms turn-on and turn-off times make it suitable for responsive BMS functions such as ground fault detection, voltage monitoring, and relay malfunction detection. Mechanically, the photorelay shares its SO16L-T pin layout with previous Toshiba models, simplifying drop-in replacements and design iterations, while AEC-Q101 qualification guarantees automotive-grade reliability. For system designers, it offers enhanced insulation integrity and dependable switching in a compact footprint, supporting higher-voltage EV and storage platforms without requiring significant layout changes. Its combination of high-voltage performance, reliability, and ease of integration makes it a versatile choice for next-generation EV battery systems and energy storage controllers, helping engineers address evolving voltage requirements and maintain safe, responsive operation. It is now available through authorized Toshiba distributors, enabling faster deployment of high-voltage BMS solutions.
