555 Timer IC

The 555 timer is the most well known IC (integrated circuit) in electronics and is useful in many circuits.

Pages covering the 3 basic 555 timer circuits:

Most, if not all, of my 555 timers are the NE555 timer with 8 through hole pin DIP (Dual inline package), that are easy to insert in to a prototype breadboard.  The following numbers are taken from the Fairchild Semiconductor LM555/NE555/SE555 datasheet:

  • Supply voltage (Vcc): Min 4.5V – Max 16V
  • Max power dissipation (Pd): 600mW

Pin layout below, starting top left and working counter clockwise. 

  • 1 – GND 
  • 2 – Trigger
  • 3 – Output
  • 4 – Reset
  • 5 – Control voltage
  • 6 – Threshold
  • 7 – Discharge
  • 8 – Vcc

When buying or using a 555 timer, or any other component for that matter, it is best to consult it’s datasheet, or other written documentation of it’s use and limitations. This skill takes a while to learn but is very rewarding once you get good. So, practice looking up datasheets! A Google search of the part name or number ie. “555 timer datasheet” will usually get you to a large number of datasheets. Try to find the specific part and manufacturer for your specific component if possible.    

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  • This website is only intended to provide supplemental information to those already studying electronics. It takes no responsibility for how that information is used and the possible injuries or other damage that may arise.