OPTOCOUPLER PACKAGE LEADFRAME AND METHOD THEREOF

摘要

A LEADFRAME (10) ARCHITECTURE PROVIDES PLACEMENT OF MULTIPLE OPTOCOUPLER PAIR DEVICES (45, 50) IN A MINIMUM SIZE FOOTPRINT PACKAGE. A DETECTOR FLAG (20) AND LED FLAG (12) ARE PLACED ON A COMMON CENTERLINE (26) WITHIN THE FOOTPRINT. A CRITICAL LENGTH IS DETERMINED FOR PACKAGING FACTORS LYING ALONG THE CENTERLINE. THE ANGLE (28) FORMED BETWEEN THE CENTERLINE AND THE LONGITUDINAL AXIS (24) CONTROLS THE OPTOCOUPLER PAIR FIT WITHIN THE PACKAGE. THE ANGLE (28) IS CALCULATED BY TAKING THE ARC-SINE FUNCTION OF THE CRITICAL LENGTH DIVIDED BY THE FOOTPRINT WIDTH.