Original Part
Alternative Part
1. PS2501A-1-W-A Substitution Conclusion
The PS2501A-1-W-A can serve as a direct drop-in replacement for the original PS2501A-1-H-A. Both parts are identical in key specifications including package, isolation voltage, and maximum output current. The primary difference lies in the current transfer ratio (CTR): the 'W' grade offers a CTR range of 130% to 260%, which fully encompasses and exceeds the 'H' grade range of 80% to 160%. Under identical input current conditions, the 'W' grade device will deliver a larger or at minimum equivalent output current, resulting in superior drive capability. This substitution is upward-compatible and poses no risk of circuit failure due to insufficient output; in fact, it provides additional performance margin.
2. PS2561A-1-V-A Substitution Conclusion
Direct substitution of the original PS2501A-1-H-A with the PS2561A-1-V-A is not recommended. While basic specifications such as package and isolation voltage are compatible, there is a significant discrepancy in the critical CTR parameter. The 'V' grade has a CTR range of 50% to 400%, where its lower limit (50%) is substantially lower than the original's lower limit (80%). Under the same input current, there is a non-negligible probability of receiving a unit with a CTR near the lower end of the 'V' range. This could lead to insufficient output current, potentially failing to drive the subsequent stage effectively and causing system malfunction. This substitution introduces a reliability risk unless the original design has substantial current margin and cost is not a constraint (allowing for post-screening).
Analysis ID: 1F66-9561000
Based on part parameters and for reference only. Not to be used for procurement or production.
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