555 Timer

The 555 timer IC is an integrated circuit (chip) used in a range of timer, delay, pulse generation, and oscillator functions. It is a useful component in model kit builds and lighting modulations.

It is a timing circuit that gives precise and highly stable delays of time or oscillation. These types of integrated circuits are cheap and reliable when compared with the OP-Amp applications in the same areas. 555Timers are used as reliable and monostable multivibrators in digital logic probes, DC-DC converters, tachometers, analog frequency meters, voltage regulators, temperature-controlled and measurement devices.


The IC SE555 can be used in temperature ranges from – 55°C to 125°C, while the IC NE555 can be used during temperature ranges of 0° to 70°C.

A monostable multivibrator is a sequential logic electronic circuit that generates an output pulse. When triggered, a pulse of pre-defined duration is produced. The circuit then returns to its stable state and produces no more output until triggered again.