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2N3904 Datasheet

2N3904 / MMBT3904 / PZT3904 – NPN General Purpose Amplifier


2N3904 General Description

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-sixties, together with the complementary PNP type 2N3906, and represented a significant performance/cost improvement, with the plastic TO-92 case replacing metal cans. It is designed for low current and power, medium voltage, and can operate at moderately high speeds. This transistor is low cost, widely available and sufficiently robust to be of use by experimenters. When looking at the flat side with the base pointed downward, the three wires emerging from the base are, left to right, the emitter, base and collector leads.(wikipedia)

2N3904 Features:

  • This device is designed as a general purpose amplifier and switch.
  • The useful dynamic range extends to 100 mA as a switch and to 100 MHz as an amplifier.

2N3904 Pinout

2n3904 pinout
2n3904 to92 sot23 sot223 pinout


2N3904 Absolute Maximum Ratings:

  • VCEO  (Collector-Emitter Voltage) = 40 V
  • VCBO  (Collector-Base Voltage)  = 60 V
  • VEBO  (Emitter-Base Voltage)  = 6.0 V
  • IC  (Collector Current – Continuous)  = 200 mA
  • TJ, Tstg (Operating and Storage Junction Temperature Range)  = -55 to +150 °C


2N3904 equivalent & complementary

2N3904 is equivalent to 2N2222. 2N2222 is an NPN transistor that can safely switch three times as much current as the 2N3904 but has otherwise similar characteristics. The BC547 can also be a good replacement as well has and a bit more gain, however do note that BC547 has a reverse pinout

The 2N3906 is the complementary (PNP) transistor for the 2N3904.


2N3904 delay and rise time Equivalent Test Circuit

2n3904 Test Circuit
2n3904 NPN Transistor - Delay and Rise Time Equivalent Test Circuit


2N3904 Data sheet download



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