HCPL-817 Phototransistor Optocoupler by Avago Technologies. Package: 4-DIP Download Avago Technologies HCPL-817 datasheet: Status: NOS (New Old Stock) RoHS Compliant: YES *** note, these items are usually ranked for certification, however these contain no top surface marking so ranking is unknowm, presume lowest spec of 50%<CTR<100% ***