Hewlett-Packard 1990-0311 & 1990-0408  
Written by Accutron on 2017-02-14  

Devices included in this entry:
Hewlett-Packard 1990-0311 numeric LED display
Hewlett-Packard 1990-0408 numeric LED display (pictured in thumbnail)

The Hewlett-Packard 1990-0311 and 1990-0408 are 7-segment numeric relatives of the 5082-7100, with an equally rugged ceramic and glass construction. As indicated by the 1990- part number prefix, these devices were only manufactured for internal use. The base part number is 1990-0311, developed as the main display of the HP 5300A Measuring System. The 1990-0408 is a nearly identical 4.5-digit variant used in the HP 2802A Thermometer.

Hewlett-Packard 1990-0311 numeric LED display, as installed in a HP 5300A Measuring System.

Hewlett-Packard 1990-0408 numeric LED display. Note the unpopulated die pads, used in the 6-digit variant of this device.

1990-0408 display, dies under magnification.

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

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