Toshiba Electronics Europe has a photocoupler which supports data rates up to 20Mbit/s.

The minimum isolation voltage is specified at 3750Vrms.
 
The TLP118 integrates a GaAlAs infrared LED, optically coupled to a high-gain, high-speed photodetector, into an SO6 package measuring 4.5x3.7x2.1mm.
 
Designed to meet the reinforced insulation requirements of global safety standards, the SO6 package has guaranteed minimum creepage and clearance distances of 5 mm and a minimum internal insulation thickness of 0.4 mm, said the supplier.

The photodetector features an internal Faraday shield to provide for a high common mode transient immunity of ±15kV/µs.

The TLP118 is configured with a general-purpose inverter logic (open collector) output stage and operates from a power supply voltage of 4.5V to 5.5V.