Editing Pro Electron (section)

===Usage in the Eastern Bloc===
Poland, Hungary, [[Electronics industry in the Socialist Republic of Romania|Romania]], and Cuba mostly used Pro Electron designations for discrete semiconductors just like Western Europe. Starting in 1971, in Poland the letter "P" was inserted, e.g. BUY54 became BUY'''P'''54.<ref>{{cite journal |author=Matuschek |title=Typenbezeichnungssystem für polnische Halbleiterbauelemente |trans-title=System of type designations for Polish semiconductor devices |language=de |pages=340 |journal=Radio Fernsehen Elektronik |publisher=VEB Verlag Technik |place=Berlin |issue=10 |year=1973 |volume=22 |issn=0033-7900}}</ref> [[Kombinat Mikroelektronik Erfurt]] (KME) in [[East Germany]] and [[Tesla (Czechoslovak company)]] used designations derived from the Pro Electron scheme. In particular, the first letter specifying the material differed while the second letter followed the table above (with the few exceptions for KME noted below).<ref name=tgl38015>{{cite book
|title=TGL 38015: Halbleiterbauelemente; Diskrete Halbleiterbauelemente und integrierte Halbleiterschaltkreise; Bildung der Typbezeichnung und Gestaltung der Typkennzeichnung
|trans-title=TGL 38015: Semiconductor Devices; Discrete Semiconductor Devices and Integrated Semiconductor Circuits; Formation of Type Designation and Marking
|publisher=Verlag für Standardisierung
|place=Leipzig
|language=de
|date=May 1986
|url=https://www.bbr-server.de/bauarchivddr/archiv/tglarchiv/tgl30001bis40000/tgl38001bis38500/tgl-38015-mai-1986.pdf
|access-date=2017-12-02
}}</ref>
{|class="wikitable"
|-
!Material
!1st letter Pro Electron
!1st letter KME East Germany
!1st letter Tesla
|-
|Germanium
|A
|G
|G
|-
|Silicon
|B
|S
|K
|-
|Compound materials (GaAs etc.)
|C
|V
|L
|-
|Multiple materials (e.g. Si + GaAs)
|C
|M
| —
|}

{|class="wikitable"
|-
!2nd letter
!KME East Germany usage
|-
|B
|Optoisolator (varicaps were included with other diodes under letter A)
|-
|M
|MOSFET (Pro Electron includes MOSFETs in letters C, D, F, L, S, U)
|-
|W
|Sensors other than radiation detectors
|}

Examples: [[Commons:File:GD241 Transistor.jpg|GD241C]] - Germanium power transistor from KME; [[Commons:File:Opto-isolator (aka).jpg|MB111]] - optoisolator from KME; [[KD503]] - Silicon power transistor from Tesla; [[Commons:File:Tesla LQ100.jpg|LQ100]] - LED from Tesla.