Original Part
Alternative Part
1. PS2501A-1-A Substitution Conclusion
Direct substitution is not recommended. While key parameters such as isolation voltage, package, and maximum output current are identical, the current transfer ratio (CTR) range of the PS2501A-1-A is 50%–400%, which is significantly wider than the original part's 80%–160%. In particular, its lower CTR limit (50%) is notably lower. Under the same input conditions, the output current could be as low as approximately 62.5% of the original part's, potentially leading to insufficient drive capability or unreliable signal transmission. A re-evaluation of the design margin in the circuit is required.
2. PS2501A-1-Q-A Substitution Conclusion
Substitution is acceptable with a slight performance improvement. The core parameters—isolation voltage, package, and current/voltage ratings—are fully matched. The PS2501A-1-Q-A offers a CTR range of 100%–200%, with a lower limit (100%) higher than the original part's 80%, providing better photoelectric conversion efficiency under low input current and improved turn-on characteristics on the output side. Note that the slightly higher CTR upper limit (200% vs. 160%) may marginally increase saturation depth, though this generally does not affect typical circuit operation.
Analysis ID: 020C-CFB8000
Based on part parameters and for reference only. Not to be used for procurement or production.
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