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Two Letters and Three numbers (eg BF 194) are used for Consumer equipment or for Entertainment purposes.

Commonly two Letters and three Numbers and three letters and two numbers are used.

The 2 nd Letter of any symbol indicates the device type and its function in the circuit eg C means small signal and D means power.

If any transistor number is AC125 then it is a germanium transistor and if BC148 is a silicon transistor. A for germanium, B for Silicon, C for gallium arsenide and R for compound (eg- cadmium sulphate). The 1 st letter of the symbol indicates the nature of semiconductor Material.JIS Semiconductor Numbering system (Japan).Pro Electron Numbering codes (European).

There is an international numbering system for all semiconductor devices and components. All Components have a particular symbolic numbering with Alphanumeric coding for represents the characteristics of the material and other parameters. Transistor And Diode identification guideĮach Semiconductor devices have a special numbering coding as per the specification of those components.