Original Part
Alternative Part
Optoisolator Transistor with Base Output 5000Vrms 1 Channel 8-DIP
Optoisolator Transistor with Base Output 5000Vrms 1 Channel 8-DIP
1. PS8501L1-V-AX Substitution Conclusion
Not feasible. The key discrepancy lies in the package: it is a wide-body 8-DIP (10.16mm), while the original part uses a standard 8-DIP (7.62mm). The footprint and mounting dimensions are completely incompatible on the PCB, preventing a drop-in replacement. Redesigning the PCB would be required for forced substitution. Although its electrical specifications—such as isolation voltage (5000 Vrms) and output voltage (35 V)—are superior to or cover those of the original part, the physical package incompatibility remains the primary and insurmountable obstacle.
2. PS8501-V-AX Substitution Conclusion
Feasible, but driving conditions must be verified. This part is fully compatible with the original part in package (8-DIP, 7.62 mm) and core functionality (transistor output with base). Two differences are noted: First, its isolation voltage (5000 Vrms) exceeds the original’s rating (3750 Vrms), providing additional insulation safety margin—a positive improvement. Second, its typical forward voltage (Vf) on the input side is higher (1.7 V vs. 1.3 V), and its maximum forward current (If) is also greater (25 mA vs. 12 mA). Under the same driving voltage, the current-limiting resistor must be recalculated or adjusted to ensure sufficient LED operating current. Otherwise, insufficient drive may reduce the current transfer ratio (CTR) and degrade signal transmission.
Analysis ID: 66AA-1F76000
Based on part parameters and for reference only. Not to be used for procurement or production.
SkyChip © 2026, Email: sales@skychip.com