Today's factoids

[Karl W4KRL]

The JEDEC Solid State Technology Association, formerly known as the Joint
Electron Device Engineering Council (JEDEC), is an independent
semiconductor engineering trade organization and standardization body.

The early work began as a part numbering system for devices which became
popular in the 1960s. The first semiconductor devices, such as the 1N23
silicon point contact diode, were still designated in the old RMA tube
designation system, where the "1" stood for "No filament/heater" and the
"N" stood for "crystal rectifier". The first RMA digit thus was
re-allocated from "heater power" to "p-n junction count" to form the new
EIA/JEDEC EIA-370 standard; for example, the 1N4001 rectifier diode and
2N2222 transistor part numbers came from EIA-370. They are still popular
today. In February, 1982, JEDEC issued JESD370B, superseding the original
EIA-370 and introducing a new letter symbol "C" that denotes the die
version, as opposed to "N", now meaning the packaged version. The Japanese
JIS semiconductor designation system employs a similar pattern. JEDEC later
developed a numbering system for integrated circuits, but this did not gain
acceptance in the semiconductor industry. The European Pro Electron
semiconductor numbering system originated in a similar way from the older
Mullard–Philips tube designation.

Earlier in the 20th century, the organization was known as JETEC, the Joint
Electron Tube Engineering Council, and was responsible for assigning and
coordinating RETMA tube designations to electron tubes (also called
valves). The type 6L6, still to be found in electric-guitar amplifiers,
typically has a type number that was assigned by JETEC.

JEDEC also developed a number of popular package drawings for
semiconductors such as TO-3, TO-5, etc. These are on the web under JEP-95.
https://www.jedec.org/category/technology-focus-area/registered-outlines-jep95

-From Wikipedia


*73 Karl W4KRL*
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