1. 6N136SDVM Substitution Conclusion From the perspectives of manufacturer, package, and fundamental electrical specifications—including channel count, isolation voltage, current transfer ratio (CTR), forward voltage (VF), and output current—the 6N136SDVM is fully aligned with the original part number. It qualifies as a direct, pin-for-pin and functionally compatible substitute. The key difference lies in its switching speed: typical turn-on/turn-off times are specified as 250 ns / 260 ns, which are superior to the original's 350 ns / 300 ns. Following substitution, signal propagation delay will be reduced, potentially leading to faster system response. This is advantageous for high-frequency applications or those with stringent timing requirements. However, in rare circuits that rely on specific delay times, verification is necessary to ensure the faster edges do not introduce timing or noise issues. Overall, this part offers complete parametric data with performance that is comparable or superior. Substitution feasibility is high. It is recommended to specifically confirm that its faster switching characteristics are fully compatible with the original system.