1/13/2024 0 Comments 2n 3904 b331Other switching transistors Pinout of 2N2222 variants in plastic TO-92 package. It is used in a variety of analog amplification and switching applications. Therefore, it is important to refer to the datasheet for the exact part number and manufacturer.Īll variations have a beta or current gain (h fe) of at least 100 in optimal conditions. The exact specifications depend on the manufacturer, case type, and variation. Other part numbers will have different parameters. JEDEC registered parameters include outline dimensions, small-signal current gain, transition frequency, maximum values for voltage withstand, current rating, power dissipation and temperature rating, and others, measured under standard test conditions. The JEDEC registration of a device number ensures particular rated values will be met by all parts offered under that number. Since then it has been made by many semiconductor companies, for example, Texas Instruments. The 2N2222 was part of a family of devices described by Motorola at a 1962 IRE convention. It is frequently used as a small-signal transistor, and it remains a small general purpose transistor of enduring popularity. The 2N2222 is considered a very common transistor, and is used as an exemplar of an NPN transistor. It was originally made in the TO-18 metal can as shown in the picture. 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. Cross section of 2N2222 in metal TO-18 package, showing connection wires between external pins and die. Typical common-base current gain in a well-designed bipolar transistor is very close to unity.2N2222A in metal TO-18 package with the emitter, base and collector identified as E, B, and C respectively. The current gain for the common-base configuration is defined as the change in collector current divided by the change in emitter current when the base-to-collector voltage is constant. It is composed of semiconductor material usually with at least three terminals for connection to an external circuit. NPN, or “sinking” output sensors, work in the opposite way, sinking ground voltage to an input when it's on.Ī transistor is a semiconductor device used to amplify or switch electronic signals and electrical power. PNP sensors produce a positive output to your industrial controls input, while NPN sensors produce a negative signal during an “on” state. 2N3904 has a gain value of 300 this value determines the amplification capacity of the transistor. It is designed for low current and power, medium voltage, and can operate at moderately high speeds.ĢN3904 is a NPN transistor hence the collector and emitter will be left open (Reverse biased) when the base pin is held at ground and will be closed (Forward biased) when a signal is provided to base pin. The 2N3904 is a common NPN bipolar junction transistor used for general-purpose low-power amplifying or switching applications.
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