A different transistor's pins may be in the order b, c, e from left to right. PCB size: FR-4, 76 mm x 114 mm x 1.57 mm (3.0 inch x 4.5 inch x 0.062 inch) with minimum land. 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. 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 base voltage of the little transistor is 0.7V when it is turned on, so if the input from the microcontroller is 5V (it might be 4V when loaded with 5mA) then the base resistor is (5V - 0. The KSP2222 is an equivalent of the 2N2222 but is packaged in a plastic package known as a TO-92 package. Any little NPN transistor ( BC547, 2N3904, 2N2222, etc) can have a collector current of 50mA when its base current is 5mA. 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). In the photo below, two different transistors are shown. 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. PN2222A NPN Transistor The PN2222A is a common NPN bipolar junction transistor (BJT) used for general purpose low-power amplifying or switching applications. This blog covers the basic information of PN2222 from its pinout, features, equivalents to its use, working principle, and its difference between 2N2222 and so on. 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. PN2222 is a conjoint NPN bipolar junction transistor which is used for common persistence less power intensifying or swapping circuits applications. 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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