A different transistor's pins may be in the order b, c, e from left to right. This is especially true for transistors in the plastic TO-92 package.Īs an example, when the KSP2222 (or PN2222) transistor's flat side (the side with the part number printed on it) is facing you with the pins down, the pins are e, b, c (emitter, base, collector) from left to right. PN2222 NPN Epitaxial Silicon Transistor Absolute Maximum Ratings Ta25C unless otherwise noted Electrical Characteristics Ta25C unless otherwise noted Pulse Test: Pulse Width300s, Duty Cycle2 Symbol Parameter Value Units VCBO Collector-Base Voltage 60 V VCEO Collector-Emitter Voltage 30 V VEBO Emitter-Base Voltage 5 V IC. transistors with different part numbers) won't necessarily have the pins in the same order. 2N2222, BC107, BC108 and BC109 Transistor Pinout Diagramĭifferent transistors (i.e. The way that a 2N2222, BC107, BC108 and BC109 transistor symbol maps to the physical device is shown in the diagram below. Transistors have three pins called emitter (e), base(b) and collector(c). Metal Can and Plastic Packaged Transistors Transistors Pins The KSP2222 is an equivalent of the 2N2222 but is packaged in a plastic package known as a TO-92 package. The 2N2222 is packaged in a metal can package known as a TO-18 package. They have the part numbers 2N2222 and KSP2222 (also available as PN2222). It is designed for low to medium current, low power, medium voltage, and can operate at moderately high speeds. The 2N2222 is a common NPN bipolar junction transistor (BJT) used for general purpose low-power amplifying or switching applications. if its avalanching, it tops off to a certain voltage (around 9.15V on a 16V supply, with voltage drops on a few other components, of course), then very, very momentarily avalanches just to go slightly under 9.15V, then stops the avalanche. In the photo below, two different transistors are shown. Cross section of 2N2222 in metal TO-18 package, showing connection wires between external pins and die. Now, experimenting with PN2222 (TO-92) and its not avalanching the same way (if it really is doing so). Transistor Part NumbersĮach transistor has a part number. The bigger the package is, the more power the transistor can handle. These are the names of the packages and not the transistor part numbers. Transistors can be packaged in many different packages, some examples are shown below: Examples of Different Transistors in Different Packagesĭifferent packages have different names, e.g. The symbols used in circuit diagrams for NPN and PNP transistors are shown below: Circuit Diagram Symbols of NPN and PNP Transistors Transistor Packages There are two types of BJTs, namely NPN and PNP. Here the BJT (Bi-polar Junction Transistor) is discussed. There are several kinds of transistors available, e.g.
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