Shanghai, China—Toshiba Electronic Devices & Storage Corporation (Toshiba) today announced the launch of an automotive-grade photorelay.TLX9165TIt adopts a 10-pin SO16L-T package and supports high-voltage automotive batteries with an output withstand voltage of 1800V (minimum).
Shorter charging times and longer driving ranges are crucial for the development and widespread adoption of electric vehicles, and both require more efficient operation of battery systems. The Battery Management System (BMS) ensures efficient system operation by monitoring the battery's state of charge, while also checking the insulation between the battery and the vehicle body to ensure the safe use of high-voltage batteries. BMSs that need to handle high voltages are now utilizing electrically isolated optocouplers.
Energy Storage Systems (ESS) also adopt a configuration similar to that of Battery Management Systems (BMS), ensuring the efficient operation of renewable energy. Since energy storage systems, like electric vehicles, handle high voltages, they are also one of the key application markets for electrically isolated photorelays.
Although 400V battery systems are currently the mainstream in electric vehicles, the growing demand for longer driving ranges and faster charging speeds is accelerating the transition to 800V battery systems. The optical relays used in these battery systems must have a withstand voltage approximately twice the system voltage. Therefore, for 800V battery systems, the withstand voltage needs to reach 1600V or higher. Toshiba's newly launched optical relay, featuring its latest high-voltage MOSFET, offers an output withstand voltage of 1800V (minimum), making it suitable for 800V battery systems.
The 10-pin SO16L-T package of this photorelay uses resin with a comparative tracking index (CTI) of over 600, which qualifies as a Class I material under the IEC 60664-1 international standard. Additionally, its pin configuration ensures a creepage distance of 7.5mm or more on the photoreceiver side. These features comply with the IEC 60664-1 standard and support an operating voltage of 1500V.
The pin pitch and pin configuration are the same as the SO16L-T package, allowing for a universal PCB pattern design.
In the future, Toshiba will continue to expand its optical relay products suitable for battery systems in automotive applications and energy storage systems for industrial equipment, contributing to the safe operation of these devices.
Application:
Onboard Equipment: BMS (Battery Voltage Monitoring, Mechanical Relay Adhesion Detection, and Ground Fault Detection, etc.)
Industrial Equipment: ESS
Replace mechanical relays
Features:
Output withstand voltage: VOFF = 1800V (minimum)
Normally Open (1-Form-A) device
Avalanche current rating: IAV=0.6mA
Isolation voltage: 5000Vrms (minimum)
Certified to AEC-Q101
Compliant with the IEC 60664-1 international standard
Features
Q1: What is Class I material?
A: Class I materials are a classification of molded materials in IEC 60664-1[4], with a Comparative Tracking Index (CTI) of over 600.
Q2: What is IEC 60664-1?
A: This standard specifies the principles, requirements, and testing methods for insulation coordination in systems with AC up to 1000V or DC up to 1500V.
Q3: What is the purpose of a creepage distance of 7.5mm?
A: The required creepage distance for a working voltage of 1500V, Class I material, and pollution degree 2 (the level of pollution in the working environment of electrical equipment: pollutants are completely non-conductive but may become conductive due to condensation).
Q4: What is IEC 60112?
A: An international standard that specifies the test method for measuring the Comparative Tracking Index (CTI) of insulating materials. This standard is used to evaluate the electrical breakdown (tracking) characteristics of solid insulating material surfaces.
Q5: What are the regulations for the CTI index?
A: IEC 60112[7] defines CTI as the maximum voltage that can be reached, under specified test conditions, before tracking occurs due to ammonium chloride solution dripping on the surface of insulating material.