The MID400 is an optically isolated AC line-to-logic interface device. It is packaged in an 8-lead plastic DIP. The AC line voltage is monitored by two back-to-back GaAs LED diodes in series with an external resistor. A high gain detector circuit senses the LED current and drives the output gate to a logic low condition.

The MID400 has been designed solely for the use as an AC line monitor. It is recommended for use in any AC-to-DC control application where excellent optical isolation, solid state reliability, TTL compatibility, small size, low power, and low frequency operations are required.

• Direct operation from any line voltage with the use of an external resistor
• Externally adjustable time delay
• Externally adjustable AC voltage sensing level
• High voltage isolation between input and output
• Compact plastic DIP package
• Logic Level compatibility
• UL recognized (File #E90700)
• VDE recognized (file #102915), add option V (e.g., MID400V)

• Monitoring of the AC/DC "line-down" condition
• "Closed-loop" interface between electromechanical elements such as solenoids, relay contacts, small motors and microprocessors
• Time delay isolation switch