Texas Instruments TIL311 
Written by AnubisTTP on 2009-02-15  


The Texas Instruments TIL311 is the definitive example of hexadecimal smart display technology. Used in innumerable electronic systems over the years, the TIL311 contains a BCD decoder and a hexadecimal character set in addition to its LED elements. The TIL311 is larger than HP's competing 7300 series of displays, but can still be inserted into a standard DIP socket. The TIL311 is so popular that they are still manufactured to the current day, and see use in a number of short-run industrial control systems and test fixtures.


Texas Instruments TIL311 LED display, normal operation. The TIL311 is one of the most popular integrated decoder LED displays ever produced.

TIL311 decoder die, 20x magnification. The display's red epoxy coating was chemically stripped on this example to provide a clear view of the decoder IC.

TIL311 decoder die, 100x magnification.

TIL311 displays are vulnerable to the slow breakdown of the plastics in their epoxy packages, usually from improper storage. This photo shows a rather extreme example of epoxy degradation; it is amazing that this display still functions at all with such a severe amount of plastic breakdown. This type of plastic degradation closely resembles the 'acetate rot' suffered by collectors of vintage casino dice.

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