Review TO-92 technical details, limits, and application notes in the manufacturer datasheet.

2N3904 NPN Transistor

2N3904 is a general-purpose NPN transistor widely used for small-signal amplification and switching.

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Quick Facts

  • NPN transistor
  • TO-92
  • Used for switching or signal amplification
  • Verify the pinout and maximum ratings in the manufacturer datasheet.

Pinout / Lead Arrangement

1
Emitter
2
Base
3
Collector

TO-92 front view

2N3904 123 EBC

TO-92 bottom view

123 EBC
ⓘ Note: With the flat face toward you, the leads follow the front-view order shown above. Turning the component over reverses left and right. Verify the pinout in the manufacturer datasheet before connecting it.
1 Emitter E2 Base B3 Collector C

Always verify the lead arrangement in the package-specific datasheet before connecting the component.

Where it is used

  • Signal amplification
  • LED switching
  • Hobby circuits
  • Learning and prototyping circuits

Equivalent / Related parts

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⚠️Common Mistake

Review 2N3904 BC547 technical details, limits, and application notes in the manufacturer datasheet.

Important notes

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