UA742 - Fairchild

UA742 ZERO-CROSSING AC TRIGGER-TRIGAC

- The p.A742 is a monolithic Zero-Crossing AC Trigger (TRIGAC) utilizing the Fairchild Planar* Epitaxial Process. It is intended for use in ae power control circuits for operation directly off the ac line or with a separate ac or de power supply. The TRIGAC functions as a threshold detector and a driver for triacs and SCA's. As a threshold detector, it sense.

Features

ME PROPORTIONING OPERATION
• PROVIDES ZERO CROSSING THYRISTOR TRIGGERING FOR MINIMUM RFI
• EVEN NUMBER OF CONSECUTIVE HALF-CYCLE TRIGGERINGS FOR TRIACS AND INVERSE PARALLEL SCR's IN MOST APPLICATIONS ABSOLUTE MAXIMUM RATINGS Peak Current into Supply Terminal (ac Operation) Continuous Current into Supply Terminal (de Operation) RMS Current into Sync Input Terminal Current into .Switch Terminal Power Dissipation Voltage at (+) or (-) Input Terminal Differential Voltage between (+) and (-) Input Terminals Current into Clamp Terminal (Clamp ON) Voltage at Clamp Terminal (Clamp OFF) Operating Temp.