Isocom, 4N38 DC Input Phototransistor Output Optocoupler, Through Hole, 6-Pin DIP. Maximum Forward Voltage: 1.5V. Number of Channels: 1. Typical Rise Time: 2µs. Maximum Input Current: 60 mA. Isolation Voltage: 5.3 kVrms. Typical Fall Time: 2µs. Minimum Current Transfer Ratio: 20 %.