Specs side by side
2 parts compared · 0 differing specs across 5 total parameters.
| Parameter | ||
|---|---|---|
| Case | DIP-4 / SMD-4 | DIP-4 / SMD-4 |
| Component Category | Phototransistor Optocouplers | Phototransistor Optocouplers |
| Market Reality | The PC817 is the optocoupler of SMPS feedback loops and low-speed isolation across every price class of equipment - one of the highest-volume optos ever made. Genuine supply is continuous, but the part is a specification, not a single part number: the CTR rank (A / B / C / D or combined bins) and the isolation class decide whether a substitute works, and the second-source universe (LTV-817, EL817, TLP521-1, HCPL-817) is enormous precisely because designers treat the function as generic. The buying question is always which rank and which vendor, not whether the part exists. | The PC817 is the optocoupler of SMPS feedback loops and low-speed isolation across every price class of equipment - one of the highest-volume optos ever made. Genuine supply is continuous, but the part is a specification, not a single part number: the CTR rank (A / B / C / D or combined bins) and the isolation class decide whether a substitute works, and the second-source universe (LTV-817, EL817, TLP521-1, HCPL-817) is enormous precisely because designers treat the function as generic. The buying question is always which rank and which vendor, not whether the part exists. |
| Role In Circuit | Original Reference Part | Original Reference Part |
| Sourcing Status | Active Shenzhen Spot Sourcing (24–48h) | Active Shenzhen Spot Sourcing (24–48h) |