In theelectronics industry, asecond source is a company that is licensed to manufacture and sell components originally designed by another company (the first source).[1]
It is common for engineers and purchasers to seek components that are available from multiple sources, to avoid the risk that a problem with one supplier would prevent a product from being manufactured. For simple components such as resistors and transistors, this is not usually an issue, but for complexintegrated circuits, vendors often react by licensing one or more other companies to manufacture and sell the same parts as second sources. While the details of such licenses are usually confidential, they often involvecross-licensing, so that each company also obtains the right to manufacture and sell parts designed by the other.
In the early TTL device period wafers were smaller so production was limited. More production lead to lower prices and new designs rapidly emerged.
MOS Technology licensedRockwell andSynertek to second-source the6502 microprocessor and its support components.
Intel licensedAMD to second-source Intel microprocessors such as the8086 and its related support components. This second-source agreement is particularly famous for leading to much litigation between the two parties. The agreement gave AMD the rights to second-source later Intel parts, but Intel refused to provide themasks for the386 to AMD. AMDreverse-engineered the 386, and Intel then claimed that AMD's license to the 386microcode only allowed AMD to "use" the microcode but not to sell products incorporating it. The courts eventually decided in favor of AMD.[2]
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