Toshiba Unveils 900 V Automotive Qualified Photocoupler Photorelay

Toshiba Electronic Devices & Storage Corporation has launched “TLX9150M,” an automotive photorelay with an output withstand voltage of 900V (min) that is highly suitable for application in 400V automotive batteries. The new photorelay is housed in a small SO12L-T package. Volume shipments start today.

Electric vehicles (EVs) are using ever higher capacity and higher voltage batteries to improve cruising range and charge time, and battery management systems (BMS) to constantly monitor and manage the battery to maximize life and performance. They also monitor the isolation between the battery and the vehicle body to ensure safety. In BMS that must handle high voltages, electrically isolated photorelays are used.

Photorelays commonly used in battery systems must have a withstand voltage approximately twice that of the system voltage; an output withstand voltage of over 800 V is necessary for a 400 V system. TLX9150M is suitable for 400 V systems as it has an output withstand voltage of 900V. It also uses the new SO12L-T package, which is 25% smaller than Toshiba's SO16L-T package. This helps to miniaturize the battery unit and allows cost reduction. The pin pitch and pin layout are the same as those of the SO16L-T, enabling a common circuit board pattern design.

Key features of TLX9150M

Output withstand voltage: VOFF=900V(min)
Normally open (1-Form-A) device
Avalanche current rating: IAV=0.6mA
High isolation voltage: 5000Vrms (min)
AEC-Q101 qualified
Compliant with IEC 60664-1 International Standard

Key applications of TLX9150M

Battery management systems: battery voltage monitoring, mechanical relay sticking detection, ground fault detection, etc.
Replacement of mechanical relays.