Over time the gain on the OC100HG will decrease as rapidly as 30% over a three-hour time frame when running both LEDs at the full rated current of 100mA.

Lower operating levels of LED current results in a slower decline in opto-coupler gain, but a gain drop has been observed in even very low LED current levels over time.

Solution – MI suggests using the OC100G opto-coupler as a replacement. Gain degradation in the OC100G is less severe over time, but the initial gain is less than that of the OC100HG. Coming Soon – Comparative Gain Degradation Graph

Recommended Replacement – We recommend the as a replacement for applications that do not require high gain.