These semiconductor devices have different characteristics according to the way they are designed and made.In the early days of thermionic valve (vacuum tube) manufacture, each manufacturer gave a number to the types they manufactured.
In this way there were vast numbers of different numbers for devices many of which were virtually identical. It soon became obvious that a more structured approach was required, so that the same device could be bought regardless of the manufacturer. They may not want to open up the specifications and manufacturing methods to others is they are using a technique they have developed. In these and similar instances, manufacturers will use their own part numbering schemes that do not conform to the industry standard schemes. To achieve this, manufacturers register a definition for new electronic components with the relevant agency and then receive a new part number. The Pro-Electron scheme providing far more information than the others. Transistor Specifications List Serial Number For TheTransistor Specifications List Serial Number ForIn this the first letter designated the heater voltage and current, the second and subsequent letters the individual functions within the glass envelope and the remaining numbers indicated the valve based and the serial number for the type. Similarities existed between the valve tube designations and those used for the semiconductor devices. Transistor Specifications List Trial Use HaveThose intended for domestic use have three numbers, but those intended for commercial or industrial use have letter followed by two numbers, i.e. ![]() A BC109C for example is a silicon low power audio transistor with a high gain. ![]() In 1944, the Radio Manufacturers Association and the National Electronic Manufacturers Association established a body called the Joint Electron Tube Engineering Council, JETEC. ![]() M means the manufacturer is Motorola, while TI means Texas Instruments, although an A added to the part number often means a revision of the specification, e.g. N2222A transistors are widely available and these are an updated version of the 2N2222. Interpreting these numbers sometimes requires a little background knowledge. In some areas it would provide a device with a unique selling point that other manufacturers could not copy. However both of these diode and transistor numbering schemes are widely used and enable the same device types to be made by a number of manufacturers. This enables equipment manufacturers to buy their semiconductors from a number of different manufactures and know that they are buying devices with the same characteristics.
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