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 (EIA), a trade association that represents all areas of the electronics industry. The Electronic Industries Alliance (EIA until 1997 Electronic Industries Association) is a Trade organization composed as an alliance of trade associations for electronics Electronics refers to the flow of charge (moving Electrons through Nonmetal conductors (mainly Semiconductors, whereas electrical For other uses of this term see Industry (disambiguation An industry (from Latin industrius, "diligent industrious"
Contents |
Origins
JEDEC was founded in 1958 as a joint activity between EIA and NEMA to develop standards for semiconductor devices. Year 1958 ( MCMLVIII) was a Common year starting on Wednesday (link will display full calendar of the Gregorian calendar. The National Electrical Manufacturers Association or NEMA is a U Semiconductor devices are Electronic components that exploit the electronic properties of Semiconductor materials principally Silicon, Germanium (NEMA dropped its involvement in 1979. ) This early work began as a part numbering system for devices which became quite popular in the 60's. For example, the 1N4001 rectifier diode and 2N2222 transistor part numbers came from JEDEC. A rectifier is an electrical device that converts Alternating current (AC to Direct current (DC a process known as rectification. Dioden2jpg|thumb|right|150px|Figure 2 Various semiconductor diodes The 2N2222, often referred to as the 'quad two' transistor is a small common NPN BJT Transistor used for general purpose low-power amplifying 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.
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 web for downloading after a free registration.
JEDEC has issued widely-used standards for device interfaces, such as the JEDEC memory standards for computer memory (RAM), including the DDR SDRAM standards. The JEDEC Solid State Technology Association is the semiconductor engineering standardization body of the Electronic Industries Alliance (EIA DDR SDRAM ( double data rate synchronous dynamic random access memory) is a class of memory Integrated circuit used in Computers It achieves nearly twice JEDEC has over 300 members, including some of the world's largest computer companies.
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 problem that reappeared since the recent ban on lead content. Metal whiskering is a Crystalline metallurgical phenomenon involving the spontaneous growth of tiny filiform hairs from a Metallic surface The Directive on the Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment 2002/95/EC ( / commonly referred to as the Restriction of Hazardous JEDEC is working with iNemi on a joint interest group on lead-free issues.
Industry standards
JEDEC's adoption of open industry standards (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. However, because JEDEC members are under no obligation to disclose related patents (including patents that are pending) 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, who's 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. [1]
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'.
- ^ ยง8. 2 of the JEDEC Manual of Organization and Procedure (JM21-M), http://www.jedec.org/Home/manuals/JM21L.pdf
External links
- Official site of JEDEC.org
- List of JEDEC member companies
- JEP95, the master JEDEC package list (free registration required)
- INemi, tin whiskers user group of iNemi, a consortium of electronics companies
Dapyx Software network: MP3 Explorer | Ebook Manager | Zenithic