![]() ![]() To at least the 1950s in American industry. Sources, a United States military standard MIL-STD-16 which dates back This standard codified information from, among other This document also has an ANSI document number, ANSI Y32.16-1975. Standard in the 1990s, but withdrew it from active support shortly IEEE 200-1975 "Standard Reference Designations for Electrical andĮlectronics Parts and Equipments" is a standard that was used toĭefine referencing naming systems for collections of electronicĮquipment. Transistor Integrated Circuits & Chips Die Electronics Voltage reference, micro integrated circuit chip, angle, electronics, text png PNG tags PNG info. (My) Summary of the Codification History:ġ950's Military defines standards for drafting to facilitate what we now call "lifecycle management"ġ970's IEEE/ANSI tries to get in on the action and set a wide reaching commercial standardġ990's IEEE tries to update it, but realizes its pointless (e.g. FYI: "T" is transformer according to ANSI/IEEE.Might refer to the Q-point ("quiescent" point) as load-line analysis (Q-point analysis, or bias analysis) came of age around the same time as the advent of the transistor.The short answer is "because said so!" (Shockley? Moore?) and then it was codified.Search for the term "transistor" in the wikipedia article, and you'll find that you're supposed to use "KF"! Transistor circuit handbook a practical reference book covering basic circuits, practical applications, and data on uses for transistors. The German wikipedia article has a complete list about all the suggested reference designators, and you can clearly see how the goal of finding one big classification, valid for everything and anything from board level design to industrial automation in large installations, has led to a big table that has FUBARed everything. Oh, and I've just found out that DIN EN 61346 has been withdrawn and replaced by IEC 81346. The current standard, DIN EN 61346, suggests the letter "K" for transistors, but I've met no one who is really hardcore enough to actually use it. Except for Germany, where discrete semiconductors (diodes, transistors) tend to be called "V" in some companies even though the standard DIN EN 60617 suggesting the letter "V" is not even valid any more, iirc. These will be the minimum voltage and current ratings of the transistor. After the bias voltage is determined, the next variable that is needed is the amount of voltage and current the load requires to operate. The letters are not used consistently in different parts of the world - "Q" for transistors, for instance, is an American tradition Europeans often call transistors "T". Figure 4: Schematic Symbols for each type of transistor. I have stopped worrying about how to call parts. ![]() "T" was already taken (transformer), and the not-so-often used letter "Q" was (i) not used for anything else and (ii) seemed appropriate for a not-so-often used type of component. Here's the rumor I have read somewhere: When transistors were new, they were that strange part no one was really using yet.
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