PN2222/PN2222A VS 2N2222/2N2222A Differences (Solved)

Last updated on March 9th, 2024 at 10:28 am

2N2222 is one of the most popular and commonly used transistors in electronics projects. But there are many variants of this transistor in the market, mainly 2N2222A, PN2222, and PN2222A. Due to this, there is a lot of confusion among beginners regarding which one to choose and what’s the difference.

But in this post, we are going to put an end to this confusion once and for all by comparing 2N2222 VS PN2222 VS 2N2222A VS PN22222 in detail.

Here are the differences between all four of them in a tabular form:

Collector-Base Voltage(VCBO) 60 V75 V60 V75 V
Collector-Emitter Voltage(VCEO)30 V40 V30 V40 V
Emitter-Base Voltage(VEBO)5 V6 V5 V6 V
Collector Current(IC)0.8 A0.6 A0.6 A1 A
DC Current Gain(hFE)300(Max)300(Max)300(Max)300(Max)
Output Capacitance(COBO)8 pF8 pF8 pF8 pF
Collector Power Dissipation(PC)1.2W1.5W625 mW625 mW
Storage Temperature(TSTG)-65 to 200°C-55 to 150°C-55 ~ 150 °C-55 ~ 150 °C
This table compares the specs of 2N2222 variants
Note: These value may vary according to the manufacturer. Please go through the dedicated datasheet provided by the manufacturer before using 2N2222.

PN2222 VS 2N2222: Short answer

2N2222 transistor is the original one whereas PN2222 is its updated version. 2N2222 comes in TO-18 metal package. PN2222 is the TO-92 plastic version of 2N2222, hence ‘P’ in PN2222.

Due to the plastic enclosing, the collector power dissipation and storage temperature ratings of PN2222 is less than 2N2222. The other absolute maximum ratings are similar.

It’s important to note that both transistors have their updated versions with alphabet ‘A’ at the end i.e, 2N2222A and PN2222A

What are 2N2222 and 2N2222A Transistors?

Both transistors are from the same family but the 2N2222A has higher Maximum absolute ratings than 2N2222. The Collector to Base, Emitter to Base, and Collector to Emitter voltage ratings of 2N2222 and 2N2222A are 60V, 30V, 5V, and 75V, 40V, 6V respectively.

Also, the 2N2222 comes in metal packaging whereas the 2N2222A is available in TO-92 plastic enclosure also. Due to this reason, the current rating of 2N2222A is slightly lower than 2N2222.

Due to different packaging, their pinout also differs, as shown below.

Note: Some companies call 2N2222 transistor "2N2222A' now and manufactures 2N2222A only.

2N2222 Pinout

2N2222 Pinout(TO-18 Package)
2N2222 Pinout(TO-18 Package)

2N2222A Pinout

2N2222 Pinout(TO-92 Package)
2N2222A Pinout(TO-92 Package)

2N2222A is a better option due to its higher ratings, low cost, and TO-92 packaging.

What are PN2222 and PN2222A Transistors?

Just like 2N2222 and 2N2222A, PN2222A has better absolute ratings than PN2222. The absolute current rating is also better. Both come in TO-92 packaging.

2N2222 and 2N2222A Pinout

Pinout of 2N2222 and 2N2222A is similar as shown below:

PN2222 Pinout Diagram
PN2222 and PN2222A Pinout Diagram

Since the cost is almost same, PN2222A is a better option considering its better ratings.


You can download the datasheet of all 2N2222 transistor variants from below:


Where to buy these transistors?

You can easily find these transistors in your local electronics store. For online purchases, we recommend this best deal on Amazon:

PN2222 and PN2222A(TO-92)

2N2222 Transistor Applications

The applications of the 2N2222 transistor are :

  • Motor driver circuits
  • Switching circuits
  • Amplifier circuits
  • Sensors circuits
  • Audio preamplifier
  • Low power application
  • Inverter circuits
  • RF circuits
  • Darlington Pair
  • Embedded and automation projects

Can a BC547 be replaced with 2N2222?

Yes, we can replace BC547 with 2N2222. BC547 transistor is considered the best equivalent of 2N2222 & can work well in your projects. Although using an equivalent transistor requires a detailed comparison, the BC547 is still a good alternative to 2N2222.

Photo of author

Ankit Negi

I am an electrical engineer by profession who loves to tinker with electronic devices and gadgets and have been doing so for over six years now. During this period, I have made many projects and helped thousands of students through my blog and YouTube videos. I am active on Linkedin.

Leave a Comment