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2N2222A Transistor: Datasheet, Pinout, Equivalents [Video&FAQ]

Author: Irene
Date: 19 Oct 2021
 1000
2N2222A Pinout

Product Overview

2N2222A 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. 2N2222A has a gain value of 110 to 800, this value determines the amplification capacity of the transistor. The maximum amount of current that could flow through the Collector pin is 800mA, hence we cannot connect loads that consume more than 800mA using this transistor. To bias a transistor we have to supply current to base pin, this current (IB) should be limited to 5mA.

 

When this transistor is fully biased then it can allow a maximum of 800mA to flow across the collector and emitter. This stage is called Saturation Region and the typical voltage allowed across the Collector-Emitter (V­CE) or Base-Emitter (VBE) could be 200 and 900 mV respectively. When base current is removed the transistor becomes fully off, this stage is called as the Cut-off Region and the Base Emitter voltage could be around 660 mV.

 

This blog will introduce 2N2222A systematically from its features, pinout to its specifications, applications, also including 2N2222A datasheet and so much more.

 

Video: 2N2222 NPN Transistor as a switch - Arduino example with LED Flash

 

Catalog

Product Overview

2N2222A Features

2N2222A Pinout

2N2222A Equivalents

2N2222A CAD Models

How to use 2N2222A Transistor

2N2222A Advantages

2N2222A Disadvantages

2N2222A Applications

2N2222A Specification

2N2222A Manufacturer

2N2222A Datasheet

Using Warnings

2N2222A FAQ

 

2N2222A Features

  • Bi-Polar high current NPN Transistor
  • DC Current Gain (hFE) is 100
  • Continuous Collector current (IC) is 800mA
  • Emitter Base Voltage (VBE) is 6V
  • Collector Emitter Voltage (VCE) is 30V
  • Base Current(IB) is 5mA maximum
  • Available in To-92 Package

 

2N2222A Pinout

The pin configuration of the 2N2222A transistor is shown below. This transistor includes three pins & its each pin functionality is discussed below.

 

2N2222A Pinout

2N2222A Pinout

 

  • Pin1 (Collector): This is the first pin of the transistor & it is an o/p pin. The main function of this pin is to provide transistor current toward the o/p load.
  • Pin2 (Base): The base pin is a control pin & it is a second pin of the transistor. The main function of this pin is to control the current from emitter to base.
  • Pin3 (Emitter): The emitter pin is the third pin of the transistor & it is used to drain out the complete current of the transistor.

 

2N2222A Equivalents

2N2907(PNP), 2N3904(PNP), 2N3906 (PNP), BC637, S9014, BC148, 2N4403, MPS2222, PN2222, KN2222, KTN2222

 

2N2222A CAD Models

The followings are2N2222A Symbol, Footprint, and 3D Model.

 

2N2222A Symbol

2N2222A Symbol

 

2N2222A Footprint

2N2222A Footprint

 

2N2222A 3D Model

2N2222A 3D Model

 

How to use 2N2222A Transistor

This transistor like all can be used either as a switch or as an amplifier. The Base-Emitter voltage of this transistor is 6V so you just have to supply this voltage across the base and emitter of the transistor to induce a base current into the transistor. This transistor will make it forward biased and thus closes the connection between collector and emitter. However one important thing to notice is the Base resistor a.k.a current limiting resistor. As the name suggests this resistor will limit the current flowing through the transistor to prevent it from damaging. The value for this resistor can be calculated using the formula: RB = VBE / IB.

 

To make things simple I have shown a simplified circuit to make a transistor as switch. In actual circuit modifications might be required. I have used a base voltage of 5V and a value of 1K as current limiting resistor.

 

simplified circuit

Simplified Circuit

 

Note that the motor here draws about 500mA from the 12V power source, since the 2N2222 has collector current rating upto 800mA this circuit is possible had it been a BC547 the transistor should have been burnt.

 

2N2222A Advantages

The main advantages of using the 2N2222 transistor include the following.

  • This is the most commonly used type of transistor
  • In electronic circuits, most of the switching applications can be done by using this transistor
  • It is capable of handling fairly high magnitude currents as compared to other similar transistors.
  • This transistor switches the load current with 800 mA through it, which is high as compared to others.
  • So this capability will make the device ideal in the applications of linear amplifiers.
  • Small size
  • Less weight
  • Voltage gain is high
  • Low source voltage
  • Low cost
  • Longer life

 

2N2222A Disadvantages

The main disadvantages of using the 2N2222A transistor include the following.

  • Sensitive
  • Depends on Temperature
  • Input impedance is low
  • Faults cannot be found easily due to small size
  • It is extremely hard to replace with new ones by unsoldering
  • It does not function efficiently like a relay or electrical, mechanical switches.

 

2N2222A Applications

The applications of the 2N2222A transistor include the following.

  • As compared to the normal NPN BC547 transistor, the 2N2222 is extremely similar, but 2N2222 allows 800mA of collector current & also 652mW of power dissipation which can be utilized for driving larger loads as compared toBC547.
  • So, the 2N2222 transistor is the best choice for switching high current loads
  • This kind of transistor is mainly used for amplifying current
  • This transistor can be used as a switch for automatically switch ON/OFF any appliances.
  • It is used for PWM due to its quick response
  • Because of its fast response time, it can be used for pulse width modulation.
  • It is typically used in automation & embedded projects.
  • Audio Preamplifiers
  • Sensor Circuits
  • Audio Amplifier Stages
  • Used to switch several loads simultaneously
  • RF Circuits
  • Darlington Pairs
  • These transistors are used in Motor drive circuits like VFD or variable frequency drives.
  • Used in Rectifier Circuits & DC Inverters
  • It is used as an amplifier to amplify voltage, current & power.
  • Darlington pair transistors are used for attaining the maximum current from the emitter terminal to the collector.

 

2N2222A Specification

Product Attribute Attribute Value
Manufacturer: Microchip
Product Category: Bipolar Transistors - BJT
RoHS: N
Mounting Style: Through Hole
Transistor Polarity: NPN
Configuration: Single
Collector- Emitter Voltage VCEO Max: 50 V
Collector- Base Voltage VCBO: 75 V
Emitter- Base Voltage VEBO: 6 V
Collector-Emitter Saturation Voltage: 300 mV
Pd - Power Dissipation: 500 mW
Minimum Operating Temperature: - 65 C
Maximum Operating Temperature: + 200 C
Packaging: Bulk
DC Current Gain hFE Max: 325 at 1 mA, 10 VDC
Technology: Si
Brand: Microchip Technology
Continuous Collector Current: 800 mA
DC Collector/Base Gain hfe Min: 75 at 1 mA, 10 VDC
Product Type: BJTs - Bipolar Transistors
Subcategory: Transistors
Unit Weight: 0.082453 oz

 

2N2222A Manufacturer

Microchip Technology Incorporated is a leading provider of smart, connected and secure embedded control solutions. Its easy-to-use development tools and comprehensive product portfolio enable customers to create optimal designs, which reduce risk while lowering total system cost and time to market. The company's solutions serve more than 120,000 customers across the industrial, automotive, consumer, aerospace and defense, communications and computing markets. Microchip offers outstanding technical support along with dependable delivery and quality.

 

2N2222A Datasheet

You can download this datasheet for 2N2222A Datasheet from the link given below:

2N2222A Datasheet

 

Using Warnings

Note: Please check their parameters and pin configuration before replacing them in your circuit.

 

2N2222A FAQ

What is 2n2222a transistor used for?

The 2N2222 is a common NPN bipolar junction transistor (BJT) used for general purpose low-power amplifying or switching applications. It is designed for low to medium current, low power, medium voltage, and can operate at moderately high speeds.

 

Is PN2222 the same as 2N2222?

2N2222 is the most common NPN bipolar junction transistor available in the market. Same as PN2222, it can be used for amplification of analog signals as well as switching applications. For most purposes, they are interchangeable.

 

How does a 2N2222A transistor work?

2N2222A 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. 2N2222A has a gain value of 110 to 800, this value determines the amplification capacity of the transistor.

 

How do you know if a transistor is NPN or PNP?

Connect the positive lead of the multimeter to the Base (B) of the transistor and connect the negative lead to the Emitter (E) of the transistor. If it is an NPN transistor then meter should show a voltage drop between 0.45V and 0.9V. If it is a PNP transistor, then it should display see “OL” (Over Limit).

 

What electronics use 2N2222 transistor?

2N2222 NPN transistor has been commonly used for switching and very high frequency(VHF) amplifier applications. It is made of silicon material and specially designed for low voltage, low to medium current and low power amplifier applications.

Ordering & Quality

Photo Mfr. Part # Company Description Package PDF Qty Pricing
(USD)
2N2222AUB 2N2222AUB Company:Microsemi Corporation Remark:TRANS NPN 50V 0.8A 3PIN SMD Package:3-SMD, No Lead
DataSheet
In Stock:2431
Inquiry
Price:
1+: $7.71000
10+: $6.96600
25+: $6.64200
100+: $5.50800
500+: $4.86000
1000+: $4.37400
2500+: $4.21200
5000+: $3.98520
9000+: $3.88800
Inquiry
JAN2N2222A JAN2N2222A Company:Microsemi Corporation Remark:TRANS NPN 50V 0.8A Package:TO-206AA, TO-18-3 Metal Can
DataSheet
In Stock:On Order
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Price:
614+: $2.60800
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JAN2N2222AUB JAN2N2222AUB Company:Microsemi Corporation Remark:TRANS NPN 50V 0.8A Package:3-SMD, Non-Standard
DataSheet
In Stock:On Order
Inquiry
Price:
200+: $6.46000
Inquiry
JANHCB2N2222A JANHCB2N2222A Company:Microchip Technology Remark:Bipolar (BJT) Transistor Package:N/A
DataSheet
In Stock:On Order
Inquiry
Price:
Call
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P2N2222A P2N2222A Company:ON Semiconductor Remark:Bipolar (BJT) Transistor NPN 40V 600mA 300MHz 625mW Through Hole TO-92-3 Package:TO-226-3, TO-92-3 (TO-226AA)
DataSheet
In Stock:On Order
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Price:
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P2N2222AG P2N2222AG Company:ON Semiconductor Remark:Bipolar (BJT) Transistor NPN 40V 600mA 300MHz 625mW Through Hole TO-92-3 Package:TO-226-3, TO-92-3 (TO-226AA)
DataSheet
In Stock:On Order
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P2N2222ARL1 P2N2222ARL1 Company:ON Semiconductor Remark:Bipolar (BJT) Transistor NPN 40V 600mA 300MHz 625mW Through Hole TO-92-3 Package:TO-226-3, TO-92-3 (TO-226AA) (Formed Leads)
DataSheet
In Stock:On Order
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P2N2222ARL1G P2N2222ARL1G Company:ON Semiconductor Remark:Bipolar (BJT) Transistor NPN 40V 600mA 300MHz 625mW Through Hole TO-92-3 Package:TO-226-3, TO-92-3 (TO-226AA) (Formed Leads)
DataSheet
In Stock:On Order
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P2N2222AZL1 P2N2222AZL1 Company:ON Semiconductor Remark:Bipolar (BJT) Transistor NPN 40V 600mA 300MHz 625mW Through Hole TO-92-3 Package:TO-226-3, TO-92-3 (TO-226AA) (Formed Leads)
DataSheet
In Stock:On Order
Inquiry
Price:
Call
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P2N2222AZL1G P2N2222AZL1G Company:ON Semiconductor Remark:Bipolar (BJT) Transistor NPN 40V 600mA 300MHz 625mW Through Hole TO-92-3 Package:TO-226-3, TO-92-3 (TO-226AA) (Formed Leads)
DataSheet
In Stock:On Order
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Price:
Call
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