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Pro Electron
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===The serial number=== Following these two letters is a 3- or 4-digit serial number (or another letter then digits), assigned by Pro Electron. It is not always merely a sequence number; there is sometimes information conveyed in the number: * In early devices only, the serial number often indicated the case/package type (e.g. AF114-7 for TO-5 case, while AF124-7 were TO-72 versions of the same transistors); modern surface-mount devices often begin with "8", * early silicon transistors followed the convention of using a middle digit of 0-5 for NPN and 6-9 for PNP. * the last digit often indicated a particular specification or application grouping, e.g. the AF117 and AF127 were similar IF amplifier devices in different cases; the BC109, BC149, BC169 and BC549 are similar low-noise transistors). * some modern devices use letters, such as "B" to indicate HBT bipolar transistors.<ref name="D15/2010-07">{{cite web |url=https://www.eusemiconductors.eu/images/downloads/PRO%20ELECTRON_D15%20final%20version%202007_12%20ESIA%20updated%2016%2007%2010.pdf |title=European Type Designation Code System for Electronic Components |edition=16 |publisher=Pro Electron |place=Brussels, Belgium |date=July 2010 |access-date=2022-05-04 |archive-url=https://web.archive.org/web/20170714160626/http://www.eusemiconductors.eu/images/downloads/PRO%20ELECTRON_D15%20final%20version%202007_12%20ESIA%20updated%2016%2007%2010.pdf |archive-date=2017-07-14}}</ref>
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