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2N2222 Datasheet, Circuit Schematic, Pinouts and Sources

About the 2N2222 Transistor and 2N2222 Datasheet

The 2N2222 transistor, often referred to as the 'quad two' transistor, is a small, common NPN BJT transistor used for general purpose low-power amplifying or switching applications. Complete technical specifications are found in the 2N2222 datasheet. For convience the 2N2222 circuit schematic is provided below.

2N2222 datasheet for download


2N2222 Pinout


2N22222 Price Check

About the 2N2222 Datasheet and Circuit Schematics

The 2N2222, often referred to as the 'quad two' transistor, is a small, common NPN BJT transistor used for general purpose low-power amplifying or switching applications. Complete technical specifications are found in the 2N2222 datasheet.   For convience the 2N2222 circuit schematic is provided below.

The 2N2222 NPN transistor is designed for low to medium current, low power, medium voltage, and can operate at moderately high speeds. It was originally made in the TO-18 metal can as shown in the picture, but is more commonly available now in the cheaper TO-92 packaging, where it is known as the PN2222 or P2N2222.

It is available in a variety of small through-hole and surface mount packages including TO-92, SOT-23, and SOT-223.

The 2N2219A and 2N2222A are silicon Planar Epitaxial NPN transistors in Jedec TO-39 (for 2N2219A) and in Jedec TO-18 (for 2N2222A) metal case. They are designed for high speed switching application at collector current up to 500mA, and feature useful current gain over a wide range of collector current, low leakage currents and low saturation voltage.

2N2907 is a complementary (PNP) transistor for the 2N2222. The 2N3904 is an NPN transistor that can only switch one-third the current of the 2N2222 but has otherwise similar characteristics. The 2N2219 is very similar with higher power dissipation.

2N2222 Transistor History

While at the Motorola Semiconductor Division in the late 1950s and early 1960s, John (Jack) Haenichen was the transistor device designer responsible for the development of the annular process, which provided the basis for the fabrication of a very successful line of silicon NPN and PNP transistors manufactured by Motorola. Building on this initial breakthrough, Jack further refined the transistor device design and process activities to include the STAR geometry. This pioneering work culminated with the introduction of the 2N2222 series of transistors by Motorola at the 1962 IRE Convention. Since the initial product launch, the 2N2222 has become the most widely used and universally recognized transistor of all time. Billions of units have been manufactured over the past 45 years and there is continuing high volume annual production.


2N2222 Transistor Circuit Schematic

2n2222 circuit schematic


2N2222 Transistor Pinout Photo

2n2222 image



2N2222 Transistor Packaging

2n2222 Pinouts


2N2222 Transistor Sources

The 2N2222 samples and purchasing information (they cost about $0.02 each) can be found at Fairchild.


Project: 2N2222 FM Transmitter

This circuit is a simple two transistor (2N2222) FM transmitter. No license is required for this transmitter according to FCC regulations regarding wireless microphones. If powered by a 9 volt battery and used with an antenna no longer than 12 inches, the transmitter will be within the FCC limits. The microphone is amplified by Q1. Q2, C5, and L1 form an oscillator that operates in the 80 to 130 MHz range. The oscillator is voltage controlled, so it is modulated by the audio signal that is applied to the base of Q2. R6 limits the input to the RF section, and it's value can be adjusted as necessary to limit the volume of the input. L1 and C6 can be made with wire and a pencil. The inductor (L1) is made by winding two pieces of 24 gauge insulated wire, laid side by side, around a pencil six times. Remove the coil you have formed and unscrew the two coils apart from each other. One of these coils (the better looking of the two) will be used in the tank circuit, and the other can be used in the next one you build. The antenna (24 gauge wire) should be soldered to the coil you made, about 2 turns up from the bottom, on the transistor side, and should be 8-12 inches long. To make C6, take a 4 inch piece of 24 gauge insulated wire, bend it over double and, beginning 1/2" from the open end, twist the wire as if you were forming a rope. When you have about 1" of twisted wire, stop and cut the looped end off, leaving about 1/2" of twisted wire (this forms the capacitor) and 1/2" of untwisted wire for leads.



Project: FM Transmitter with the 2N2222

Here is the schematic, PC board pattern, and parts placement for a low powered FM transmitter. The range of the transmitter when running at 9V is about 300 feet. Running it from 12V increases the range to about 400 feet. This transmitter should not be used as a room or telephone bug.

2n2222 FM Transmitter


Project: Transistor Shortwave Radio

Designed by Charles Kitchin, N1TEV, the schematic appeared in the August 18, 1994 edition of EDN magazine. The article is titled, “$10 receiver has microvolt sensitivity.”

This radio uses three 2N2222 transistors, while the P-Box radio uses one NPN transistor and two PNP transistors. The 2N2222s are easy to come by.


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