Replacement Components to 6N136: 6N136M and SFH6136

Original Part

6N136

onsemi

Optoisolator Transistor with Base Output 2500Vrms 1 Channel 8-DIP

Alternative Part

6N136M

Lite-On Inc.

Optoisolator Transistor with Base Output 5000Vrms 1 Channel 8-DIP

SFH6136

Vishay Semiconductor Opto Division

Optoisolator Transistor with Base Output 5300Vrms 1 Channel 8-DIP

1. 6N136M Substitution Conclusion The 6N136M is a functionally viable direct replacement, but presents a critical mechanical compatibility issue. Its primary technical advantages include an enhanced isolation voltage of 5000 Vrms (compared to the original 2500 Vrms), offering significantly improved insulation and high-voltage surge immunity, making it suitable for applications requiring higher safety isolation. Furthermore, its switching speed is notably faster (typical turn-on time of 100 ns vs. 450 ns), which is beneficial for increasing system signal bandwidth. However, its package height is 10.16 mm (original: 7.62 mm). This increased PCB mounting height may cause mechanical interference and prevent direct installation if the original design has strict constraints on component clearance or housing gap.

2. SFH6136 Substitution Conclusion The SFH6136 demonstrates good substitution feasibility in both electrical performance and physical package, though two parameter differences require attention. It offers the highest isolation voltage (5300 Vrms), providing the strongest electrical isolation safety. Its switching times are symmetrical and relatively fast (200 ns/200 ns), resulting in different but more balanced system timing characteristics compared to the original part. Its package is identical to the original 6N136 (7.62 mm DIP), ensuring mechanical compatibility. Key differences to note are: its typical forward voltage is slightly higher (1.6 V vs. 1.45 V), meaning the drive circuit may require a slightly higher voltage or consume marginally more power at the same operating current. Additionally, its datasheet does not specify a maximum Current Transfer Ratio (CTR). For circuit design, conservative calculations must be based on the minimum CTR (19%), and output drive capability under worst-case conditions must be verified.

Analysis ID: CE32-C572000

Based on part parameters and for reference only. Not to be used for procurement or production.