Numbering and coding schemes
There are many common, standard and manufacturer-driven numbering and coding schemes for the diodes; the two most common being EIA/JEDEC standard and European Pro Electron standard:
EIA/JEDEC
The standardized 1N-series numbering system was introduced in US by EIA/JEDEC (Joint Electron Device Engineering Council) in 1960. The most accepted in this series were:
1N34A/1N270 (Germanium signal), 1N914/1N4148 (Silicon signal), 1N4001-1N4007 (Silicon 1A power rectifier) and 1N54xx (Silicon 3A power rectifier)
Pro Electron
The European Pro Electron coding system for active components was introduced in 1966 and comprises two letters followed by the part code. First letter represents semiconductor material used for the component (A = Germanium and B = Silicon) and the second letter represents the general function of the part (for diodes: A = low-power/signal, B = Variable capacitance, X = Multiplier, Y = Rectifier and Z = Voltage reference), for example:
• AA-series germanium low-power diodes (for example: AA119)
• BA-series silicon low-power diodes (for example BAT18 Silicon RF Switching Diode)
• BY-series silicon rectifier diodes (for example BY127 1250V, 1A rectifier diode)
• BZ-series silicon zener diodes (for example BZY88C4V7 4.7V zener diode)
Other common numbering systems (commonly manufacturer-driven) include:
• GD-series germanium diodes (for example GD9) — this is very old coding system
• OA-series germanium diodes (for example OA47) — coding sequence developed by Mullard, a UK company
Related devices
• Transistor
• Thyristor or silicon controlled rectifier (SCR)
• TRIAC
• Rectifier
• Diac
• Varistor
In optics, the equivalent device for diode but with laser light would be the Optical isolator, also called as an Optical Diode which allows light to only pass in one direction. It uses a Faraday rotator as the basic component.
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