JEDEC

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JEDEC

JEDEC Solid State Technology Association, formerly known as Joint Electron Device Engineering Council (JEDEC) or Joint Electron Device Engineering Councils, is the semiconductor engineering standardization body of the Electronic Industries Alliance

Electronic Industries Alliance

The Electronic Industries Alliance is a trade organization composed as an alliance of trade associations for electronics manufacturers in the United States....
(EIA), a trade association that represents all areas of the electronics

Electronics

Electronics refers to the flow of charge through nonmetal electrical conductor , whereas electrical refers to the flow of charge through metal electrical conductor....
industry

Industry

An industry is the manufacturing of a Good or Service within a category. Although industry is a broad term for any kind of economic production, in economics and urban planning industry is a synonym for the secondary sector, which is a type of economic activity involved in the manufacturing of raw materials into goods and products....
in the United States

United States

The United States of America is a Federal government constitutional republic comprising U.S. state and a federal district. The country is situated mostly in central North America, where its Contiguous United States and Washington, D.C., the Capital districts and territories, lie between the Pacific Ocean and Atlantic Oceans, Borders of the U...
. JEDEC has over 300 members, including some of the world's largest computer companies.

Origins
JEDEC was founded in 1958 as a joint activity between EIA and NEMA

National Electrical Manufacturers Association

The National Electrical Manufacturers Association or NEMA is a United States-based association, which was created on September 1, 1926, when the Associated Manufacturers of Electrical Supplies and the Electric Power Club merged....
to develop standards for semiconductor device

Semiconductor device

Semiconductor devices are electronic components that exploit the electronics properties of semiconductor materials, principally silicon, germanium, and gallium arsenide....
s.

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Encyclopedia

Electronic Industries Alliance

Electronics

Electronics refers to the flow of charge through nonmetal electrical conductor , whereas electrical refers to the flow of charge through metal electrical conductor....
industry

Industry

United States

Origins

JEDEC was founded in 1958 as a joint activity between EIA and NEMA

National Electrical Manufacturers Association

Semiconductor device

Semiconductor devices are electronic components that exploit the electronics properties of semiconductor materials, principally silicon, germanium, and gallium arsenide....
s. (NEMA dropped its involvement in 1979.) This early work began as a part numbering system for devices which became quite popular in the '60s. For example, the 1N4001 rectifier

Rectifier

A rectifier is an electrical device that converts alternating current to direct current , a process known as rectification. Rectifiers have many uses including as components of power supply and as detector s of radio signals....
diode

Diode

In electronics, a diode is a two-terminal device .Diodes have two active electrodes between which the signal of interest may flow, and most are used for their unidirectional electric current property....
and 2N2222 transistor

2N2222

The 2N2222, often referred to as the 'quad two' transistor, is a small, common NPN transistor Bipolar Junction Transistor transistor used for general purpose low-power amplifier or switching applications....
part numbers came from JEDEC. These part numbers are still popular today. JEDEC later developed a numbering system for integrated circuits, but this did not gain acceptance in the semiconductor industry.

Earlier in the 20th century, the organization was known as JETEC, the Joint Electron Tube Engineering Council, and was responsible for assigning and coordinating type numbers of electron tubes (also called valves). The type 6L6

6L6

6L6 is the designator for a vacuum tube introduced by Radio Corporation of America in July 1936. At the time Philips had already developed and patented power pentode designs, which were fast replacing power triodes due to their greater efficiency....
, still to be found in electric-guitar amplifiers, typically has a type number that was assigned by JETEC.

Test methods and product standards

This early work was followed by a number of test methods, JESD22, and product standards. For example, the ESD caution symbol, which is the hand with the line drawn through it, was published by JEDEC and is used worldwide. JEDEC also has a dictionary of semiconductor terms. All of JEDEC standards are free on the Web for downloading after a free registration.

JEDEC has issued widely-used standards for device interfaces, such as the JEDEC memory standards

JEDEC memory standards

The JEDEC Solid State Technology Association is the semiconductor engineering standardization body of the Electronic Industries Alliance . Semiconductor memory is a very active area of standardization today....
for computer memory (RAM), including the DDR SDRAM

DDR SDRAM

DDR SDRAM is a class of memory integrated circuits used in computers. It achieves nearly twice the bandwidth of the preceding "single data rate" SDRAM by double data rate without increasing the clock frequency....
standards.

Package drawings

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. One hot issue is the development of lead-free packages that do not suffer from the tin whiskers

Whisker (metallurgy)

Metal whiskering is a crystalline metallurgy phenomenon involving the spontaneous growth of tiny, crystal habit hairs from a metallic surface....
problem that reappeared since the recent ban on lead content

Restriction of Hazardous Substances Directive

The Directive on the restriction of the use of certain hazardous substances in electrical and electronic equipment 2002/95/EC was adopted in February 2003 by the European Union....
. JEDEC is working with iNemi on a joint interest group on lead-free issues.

Industry standards

JEDEC's adoption of open industry standards

Open standard

An open standard is a standard that is publicly available and has various rights to use associated with it, and various properties of how it was designed....
(i.e., standards that permit any and all interested companies to freely manufacture in compliance with adopted standards) serves several vital functions for the advancement of electronic technologies. First and foremost, such standards allow for interoperability between different electrical components. JEDEC standards do not protect members from normal patent obligations. The designated representatives of JEDEC member companies are required to disclose patents and patent applications of which they personally are aware (assuming that this information is not considered proprietary). JEDEC patent policy requires that standards found to contain patents, whose owners will not sign a standard JEDEC patent letter, be withdrawn. Thus the penalty for a failure to disclose patents is retraction of the standard. Typically, standards will not be adopted to cover technology that will be subject to patent protection. In rare circumstances, standards covered by a patent may be adopted, but only on the understanding that the patent owner will not enforce such patent rights or, at a minimum, that the patent owner will provide a reasonable and non-discriminatory license to the patented technology.

Today

In the fall of 1999, JEDEC became a separate trade association, but still within the EIA Alliance. The new association was known as 'JEDEC Solid State Technology Association'.

External links

the master JEDEC package list (free registration required)
, tin whiskers user group of iNemi, a consortium of electronics companies