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| Diode | Zener diode | Schottky diode | Tunnel diode |
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| Light-emitting diode | Photodiode | Varicap | Silicon controlled rectifier |
Numbering and coding schemes
There are a number of common, standard and manufacturer-driven numbering and coding schemes for diodes; the two most common being the EIA/JEDEC standard and the European Pro Electron standard:
EIA/JEDEC
A standardized 1N-series numbering system was introduced in the US by EIA/JEDEC (Joint Electron Device Engineering Council) about 1960. Among the most popular in this series were: 1N34A/1N270 (Germanium signal), 1N914/1N4148 (Silicon signal), 1N4001-1N4007 (Silicon 1A power rectifier) and 1N54xx (Silicon 3A power rectifier)[24][25][26]
Pro Electron
The European Pro Electron coding system for active components was introduced in 1966 and comprises two letters followed by the part code. The first letter represents the 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/signal diodes (e.g.: AA119)
- BA-series silicon low-power/signal diodes (e.g.: BAT18 Silicon RF Switching Diode)
- BY-series silicon rectifier diodes (e.g.: BY127 1250V, 1A rectifier diode)
- BZ-series silicon zener diodes (e.g.: BZY88C4V7 4.7V zener diode)
Other common numbering / coding systems (generally manufacturer-driven) include:
- GD-series germanium diodes (ed: GD9) — this is a very old coding system
- OA-series germanium diodes (e.g.: OA47) — a coding sequence developed by Mullard, a UK company
As well as these common codes, many manufacturers or organisations have their own systems too — for example:
- HP diode 1901-0044 = JEDEC 1N4148
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