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Global Popularity

Popularity in Transistors

Popularity in Small Signal Bipolar Transistors

Popularity by Region

Very High




  • 1. United States of America
  • 2. China
  • 3. Austria
  • 4. India
  • 5. Mexico
  • 6. South Korea
  • 7. Algeria
  • 8. Paraguay
  • 9. France
  • 10. Colombia

Datasheets & Reference Designs


ON Semiconductor

Also for: 2N3904RLRPG, 2N3904RL1G, 2N3904RLRM and 5 others.
  • 2N3904RLRMG,
  • 2N3904RLRA,
  • 2N3904G,
  • 2N3904NLBU,
  • 2N3904ZL1G

Frequently Asked Questions (FAQ)

  • Q: Where can I find 2N3904 NPN transistor specifications?

    A: The 2N3904 is a common NPN bipolar junction transistor used for general-purpose low-power amplifying or switching applications. The type was registered by Motorola Semiconductor in the mid-1960s, together with the complementary PNP type 2N3906, and represented a significant performance/cost improvement, with the plastic TO-92 case replacing metal cans. more

  • Q: Where can I find a 2N3904 pinout?

    A: 2N3904 Pin Configuration:Emitter,Base,Collector more

  • Q: Is there a 2N3904 equivalent transistor?

    A: Any of the substitutes you already mention will work: 2N2222, 2N4401, 2N2907, BC547. Really any general-purpose small-signal transistor will work for this circuit. more

  • Q: Where can I find 2N3904 transistor specifications?

    A: The 2N3904 is an extremely popular NPN transistor that is used as a simple electronic switch or amplifier that can handle 200 mA (absolute maximum) and frequencies as high as 100 MHz when used as an amplifier. more

  • Q: What is the SMT Equivalent of a 2N3904 Transistor?

    A: The MMBT2222ALT3G from ON Semiconductors looks nice.BC547/548/549. In smd these are called BC847 etc. Their max Ic=100mA though. more

  • Q: Where can I compare a 2N3904 and a 2N2222?

    A: The 2N3904 and the 2N2222 are 2 of the most popular NPN bipolar junction transistors in the electronics market. In case you're curious about which to use, or which one is better or superior than the other, in this article, we compare and contrast the 2 transistors. more

  • Q: What is beta/hFE/Gain in transistor theory?

    A: Anyway so somehow they got to explaining how to find the DC current gain of a transistor based on its datasheet and such more

  • Q: Where can I find a 2N3904 switch circuit schematic?

    A: The transistor actually works as a current gainer; any current applied to the base terminal will be multiplied by the current gain factor of the transistor which known as hFE. Therefore transistor can be used as amplifier; any small signal (very small current) applied to the base terminal will be amplified by the factor of hFE and reflected as a collector current on the collector terminal side. more

  • Q: How do I use a 2N3904 to switch applications with Arduino?

    A: I use 2N3904 as switch to power off/on the NEO-6M module control by Atmega328p. more

  • Q: Where can I compare a 2N3904 and a BC547?

    A: The 2N3904 has a maximum collector current rating of 200 mA and power dissipation of 625 mW. This compares well with the BC547, BC548, and BC549 general purpose transistors which have a peak collector rating of 200 mA and power dissipation of 500 mW. more

  • Q: Where can I find 2N3904 BJT specifications?

    A: In this tutorial we’ll introduce you to the basics of the most common transistor around: the bi-polar junction transistor (BJT). more

  • Q: Where can I learn about using bipolar transistors as switches?

    A: While transistors have many uses, one of the less known uses by amateurs is the ability for bipolar transistors to turn things on and off. While there are limitations as to what we can switch on and off, transistor switches offer lower cost and substantial reliability over conventional mechanical relays. In this article, we will review the basic principles for transistor switches using common bipolar transistors. more

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