Original Part
Alternative Part
1. PS2561A-1-H-A Substitution Conclusion
Direct substitution is not recommended. The key deviation lies in the Current Transfer Ratio (CTR). The PS2561A-1-H-A has a CTR range of 80%–160% (@5mA), which is significantly lower than the 130%–260% of the original PS2501A-1-W-A. Under identical input current conditions, the PS2561A-1-H-A provides weaker output current drive capability. This may result in unreliable driving of the load as per the original design, or signal transmission failure in applications requiring higher gain, posing a risk of insufficient performance.
2. PS2561A-1-V-A Substitution Conclusion
Substitution is conditionally acceptable, pending circuit compatibility evaluation. The difference again centers on CTR, with a range of 50%–400% (@5mA). The lower limit is much lower than that of the original part, while the upper limit is higher. This indicates extremely high gain dispersion: some units may fail to turn on effectively due to excessively low CTR, while others may enter deep saturation with slower response times due to excessively high CTR. If substituting into the original circuit, it is essential to verify the circuit's tolerance to CTR variation or implement additional screening tests to ensure performance consistency. Otherwise, system reliability issues may arise.
Analysis ID: DE83-7946000
Based on part parameters and for reference only. Not to be used for procurement or production.
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