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Lastly, and there is a serial number system that runs from 100-9999. The third letters you'll find on transistors include W, X, Y, or Z. On the other hand, those without a letter are used in commercial applications. A transistor with the third letter is common in industrial/professional applications. In Zener diodes or a voltage regulator diodeĪdditionally, the other important part of this transistor code system is the third letter. Power thyristors for use in switching functions Second LetterĪudio frequency amplifier, Transistor, Small frequencyĪudio frequency power amplifier, Power Transistor, Here are the codes for the suffix letter. Thus, from the second letter, you can identify the device type compatible with the type of transistor. The second letter code for transistors represents the device application. Next, an additional letter gives further info on transistor coding. Thus, the most common transistor types are made of Silicon. Note, you'll find the letter B as the first letter in most codes for transistors. Here are the materials represented by the 1st letter in this naming system. The first letter of the code will represent the type of materials used to manufacture the transistor. In our case, we'll look at how the system is useful in naming a signal transistor.Īccording to this European naming system, two letters precede numbers in transistors. It is designed to name the signal diode (s), bipolar transistors, and FETs. The EECA coding system represents the coding scheme adopted in European nations. Pro-Electron or EECA Numbering Coding System

Join us as we delve into the basics of transistor coding. Thus, our article will answer the various component questions of transistors by primarily explaining the transistor coding system.

However, if you understand the coding schemes of transistors, you can select the best for a particular circuit topology. Identifying the transistor types can be quite confusing. But do you know that there are various transistor types? Also, what kind of transistor do you use on a simple circuit? One of the most common electronic components is a transistor.