Stacked LED Technology Enables Highly Integrated Optocouplers

Optocouplers are widely used in providing galvanic isolation because of their true isolation characteristics. In some applications, it is very desirable to increase the number of optocouplers in a single package in order to optimize manufacturing costs and save space on printed circuit boards (PCBs). However, previous engineering attempts to integrate more than two optocouplers into a single package have proved to be a challenge. The limitation is in the current hybrid manufacturing process of putting several LEDs and IC devices in a monolithic package.

The development of a new manufacturing process called Stacked LED Technology—stacking LED die directly on a silicon IC substrate—has helped to enable higher integration in monolithic IC packaging.

This paper introduces Stacked LED Technology and describes its unique components and benefits.