Monsanto MAN1 LED Display (MAN-1, MAN1A)  
Written by AnubisTTP on 2007-07-22  



Devices included in this entry:

Monsanto MAN1 (14-pin clear epoxy DIP; pictured in thumbnail)
Litronix MAN1 (14-pin clear epoxy DIP)
Monsanto MAN1A (14-pin red epoxy DIP)

The MAN-1 is generally considered to be the world's first production seven-segment LED display. Following the introduction of the MAN1, the now-familiar seven-segment LED rapidly took over the world, wiping out the demand for Nixie tubes, Minitrons, Panaplex displays, and many other display technologies in a single blow. Each segment of the MAN-1 is made up of two silicon wafers, which each contain four diode elements. With the inclusion of a decimal point, the entire display contains 57 separate light emitting sectors, which is quite a lot compared to modern displays which typically only use a single diode for each segment, or even a single etched die for each character. The MAN-1's first-generation diode technology results in a very dim display, but the virtual immortality of LED technology was a drastic improvement over the incandescent Minitron displays and complex gas-filled devices it was designed to compete with.

Soon after the release of the MAN-1, Monsanto introduced a modified version, the MAN-1A. The MAN-1A is identical in functionality and basic construction to a standard MAN-1, but has a dark red epoxy case which does a great deal to hide the display's ugly internal construction.


Monsanto MAN1 LED Display
Monsanto MAN-1 display.

Monsanto MAN1A LED Display
The Monsanto MAN1A appears nearly identical to a standard MAN1, but has a red epoxy package which hides much of the crude internal construction.

Litronix DL10 LED Display
MAN-1 family photo: the center display is a rare Litronix-manufactured MAN-1.

Monsanto MAN1 LED Dies
Monsanto MAN-1 die structure, 20x magnification.

Monsanto MAN1 LED Readout
MAN1 top.

MAN-1 underside. This example has clipped leads.

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