“Photo-relays commonly used in battery systems must withstand a voltage of approximately twice the system voltage, therefore, an output withstand voltage of over 1,600V is required for an 800V system,” according to the company. “Toshiba’s TLX9165T meets and exceeds this requirement.”
The high-voltage mosfets inside were developed for this device, and are installed as a back-to-back pair allowing circuits of either polarity to be switched.
Maximum output on-resistance for the device is 600Ω over -40 to +105°C when conducting 12mA and the input driven with 10mA.
Over the full -40 to +125°C operating range, 680Ω can be achieved when passing 6mA with a drive of 10mA.
This drops to 340Ω max at 25°C while passing 30mA, again with 10mA drive – all of the resistance figures above are specified with the device on for less than one second.
The package has pins removed to increase creepage and clearance to 8mm.
It is “adequate for the automotive control applications with a battery voltage of 1,500V or less in an environment with a pollution degree 2 since the creepage distance on the detector side is 7.5mm or more,” said Toshiba.
Isolation is 5kVrms, internal insulation is at least 0.4mm and the outer resin has a CTI (comparative tracking index) above 600.
Qualification is to AEC-Q101 and it complies with IEC 60664-1.
Use is foreseen in battery management systems detecting mechanical relay sticking and ground faults, as well as replacing mechanical relays.
Find the TLX9165T on this Toshiba web page
For very high voltage isolated switching, Pickering has reed relays rated at 12.5kV
