National Semiconductor NSA578  
Written by Accutron on 2017-02-17  

Though it appears externally similar to the NSN66A, the National Semiconductor NSA578 has a substantially different internal construction. Instead of having one die per segment, the NSA578 has a single planar die per digit, mounted on a PCB substrate, with separate dies for each decimal point. Like the NSN66A, the NSA578 has a red plastic cover to protect the dies and bond wires.

National Semiconductor NSA578 numeric LED display.

NSA578 display, internal construction under magnification.

This article is part of the [Integrated Optoelectronics] exhibit.

©2000-2019 The Vintage Technology Association. All rights reserved.