High-voltage optoisolator focuses on industrial, transportation and medical applications

March 06, 2012 // By Paul Buckley
TT electronics Optoelectronics Business Unit claims that the company's OPI1268S has become the industry's only high-voltage optoisolator to carry all four of the UL, VDE, ATEX/IECex and IP65 certifications for operation in harsh and potentially hazardous environments. Featuring 20 kV isolation and less than 50 ns propagation delay, the OPI1268S is ideal for metering equipment, transportation systems, hybrid vehicles, medical devices, and industrial control/safety systems.

The OPI1268S optoisolator is based on a high-efficiency LED with a peak wavelength of 850 nm, optically coupled to a photodiode that detects incoming modulated light and converts it to a proportionate current. The device features a high-gain linear amplifier that is temperature-, current-, and voltage-compensated, resulting in a highly stable digital output with a data transfer rate of 2 Mbits/s and a typical propagation delay (tPHL-tPLH) of less than 50 ns.      

Capable of isolating voltages up to 20 kV, the OPI1268S also provides a voltage spike immunity of 30 kV/microS dv/dt. As a result, the OPI1268S is unprecedented in protecting users, robotic interfaces and control circuits from high voltage.      

Additional features include an input diode with a forward voltage of 1.8 V (max)  at IF = 20 mA and a continuous forward current of 50 mA. Reverse current is 100 µA (max) at VR = 2.0 V with reverse voltage of 3.0 V. The output IC operates with 7 V supply voltage with 40 mW power dissipation. Operating temperature range is from -50 to +100°C.      

The OPI1268S is available now, supplied in a five-lead configuration measuring 27.94 mm x 6.35 mm x 8.89 mm.