SFH6138/ SFH6139 Vishay Semiconductors High Speed.
SFH6138 - (SFH6138 / SFH6139) High Speed Optocoupler / 100 kBd / Low Input Current / High Gain
SFH6139 - (SFH6138 / SFH6139) High Speed Optocoupler / 100 kBd / Low Input Current / High Gain