Introduction to mid400, mid400 pinout, mid400 power ratings, mid400 applications Hi Everyone! Hope you’re well today. Happy to see you around. In this post today, I’ll walk you through the Introduction to MID400. The MID400 is an 8-pin optically isolated AC line-to-logic Power Line Monitor Optocoupler. The AC line voltage is detected by two back-to-back LEDs that are connected ...