High voltage automotive photorelay for battery management systems

28-01-2022 | Toshiba | Connectors, Switches & EMECH

Toshiba Electronics Europe GmbH has released a new normally open (NO) 1-Form-A photorelay aimed at many battery- and hybrid-electric vehicle applications, including within the BMS, ground fault detection and identifying faults with mechanical relays.

The new TLX9160T comprises an infrared emitting diode optically coupled to a photo-MOSFET and is its first device with a high output withstand voltage (VOFF) of at least 1500V. The device can function from a supply voltage (VDD) of up to 1000V, ensuring that it is compatible with most traction batteries.

Accommodated in a modified SO16L-T package made from a resin material in IEC60664-1 material group I, which has a CTI exceeding 600, the device has four fewer pins (pins 11 to 14 are removed from the standard SO16L package). The product provides a creepage distance of at least 5mm at its detector, assuring that it is compatible with supply voltages up to 1000V – as defined by IEC60664-1. Consequently, the isolation voltage (BVS) is 5000Vrms (min), and internal creepage and clearance distances are 8mm.

The maximum forward current (IF) is 30mA, while the On-state current (ION) is 50mA with an Off-state current (IOFF) of just 100nA. Ideal for the rugged automotive environment, the device is fully AEC-Q101 qualified with an operating temperature (Topr) from -40C to +125C.

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