Isocom, TLP521-2SMT&R AC Input NPN Phototransistor Output Dual Optocoupler, Surface Mount, 8-Pin SMD. Maximum Forward Voltage: 1.3V. Typical Rise Time: 4µs. Maximum Input Current: 50 mA. Isolation Voltage: 5300 (Minimum) Vrms. Maximum Current Transfer Ratio: 6.0. Typical Fall Time: 3µs. Minimum Current Transfer Ratio: 0.5.