1. 6N135S(TB)-V Substitution Conclusion The feasibility of substituting the 6N135S(TB)-V for the original 6N136-X017T is low. Key discrepancies present potential issues: The isolation voltage is reduced to 5000Vrms (300Vrms lower than the original 5300Vrms), which may pose a safety risk or fail to meet specifications in applications with stringent high-voltage isolation requirements. The minimum Current Transfer Ratio (CTR) is significantly degraded to 7% (vs. the original 19%), leading to reduced signal transmission efficiency. This degradation may necessitate higher input current to maintain output drive, thereby increasing circuit design complexity. Switching times are notably slower (typical 350ns turn-on / 500ns turn-off, compared to the original 200ns/200ns), limiting performance in high-speed signal processing or switching applications and potentially causing timing delays. Although the maximum output voltage is increased to 20V (from the original 15V), providing wider voltage headroom, the degradation in core parameters necessitates caution in direct substitution. This substitute is only suitable for low-frequency or non-critical applications where isolation voltage, CTR, and speed are not stringent requirements.