Original Part
Alternative Part
1. HCPL-817-30AE Substitution Conclusion
The HCPL-817-30AE can serve as a replacement for the EL817(S1)(TB). However, key differences must be noted: it features a narrower Current Transfer Ratio (CTR) range (80%-160% vs. the original part's 50%-600%). This results in higher and more consistent optocoupler transfer efficiency at low input currents. If the original design relies on a low CTR operating point (e.g., 50%), the drive current may need to be re-validated. Additionally, its output withstand voltage is higher (70V vs. 35V), offering greater adaptability. Note that its maximum forward current is slightly lower (50mA vs. 60mA); ensure the input-side drive capability does not cause overload. The package and basic isolation parameters are identical, allowing for direct substitution. It is recommended, however, to verify dynamic response and power dissipation matching in the actual circuit.
2. HCPL-817-30BE Substitution Conclusion
The HCPL-817-30BE can replace the EL817(S1)(TB). Critical attention must be paid to its significantly higher Current Transfer Ratio (CTR) range (130%-260% vs. the original part's 50%-600%). This may cause the output to saturate or alter the response speed under the same input current in the original design. Adjustments to the input resistor or drive current may be necessary to prevent malfunction. Its output withstand voltage is improved to 70V (superior to the original part's 35V), but the maximum forward current is slightly reduced to 50mA, which may limit the maximum drive conditions on the input side. The package and isolation ratings are identical, permitting direct solder-in replacement. It is essential to perform in-circuit measurements to ensure switching characteristics and power dissipation meet the application requirements.
Analysis ID: 0A0E-4C2A000
Based on part parameters and for reference only. Not to be used for procurement or production.
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