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2N3904

Common NPN bipolar junction transistor

Common NPN bipolar junction transistor

The 2N3904 is a common NPN bipolar junction transistor used for general-purpose low-power amplifying or switching applications. It is designed for low current and power, medium voltage, and can operate at moderately high speeds. It is complementary to the 2N3906 PNP transistor. Both types were registered by Motorola Semiconductor in the mid-1960s.

Device packaging and specifications

The construction of the 2N3904 and 2N3906 in the 1960s represented a significant performance and cost improvement, with the plastic TO-92 case replacing metal cans. This transistor is a low-cost device, widely available and sufficiently robust to be of use by experimenters and electronics hobbyists.

It is a 200 mA, 40 V, 625 mW transistor with a transition frequency of 300 MHz, with a minimum beta, or current gain, of 100 at a collector current of 10 mA.

Part numbers

Pinout of 2N3904 in TO-92 package. Top view or PCB layout view is shown in the lower right corner.

The 2N3904 (NPN) and 2N3906 (PNP) are complementary transistor pairs. These transistors are available in package styles TO-92, SOT23, SOT223 with different prefixes.

BJTThru-holeSurface-mountTO92SOT23SOT223
NPN2N3904MMBT3904PZT3904
PNP2N3906MMBT3906PZT3906

References

References

  1. JEDEC]]
  2. (August 2012). "2N3904 Datasheet (TO-92)".
  3. (February 2010). "2N3906 Datasheet (TO-92)".
  4. (January 2013). "2N3904 Datasheet (TO-92)".
  5. (October 2017). "2N3904 Datasheet (TO-92)".
  6. Silver, H. Ward. (2008). "Circuitbuilding do-it-yourself for Dummies". For Dummies.
  7. Predko, Michael. (2004). "123 robotics experiments for the evil genius". McGraw-Hill Professional.
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