In the year 1971 by Hans R. Camenzind has designed the 555 timer integrated circuit with the contract of Signetics. Later on it came to Dutch company which is Philips semiconductors. The manufacturing of 555 timer IC includes the transistors, diodes, and resistors on the silicon chip which are on the 8 – pin mini dual in line packages. There are different types of timers available like 556 which include the 14 pin dual in line package are gathering the 555s on one chip. The other types of timers are 558 and 559 for both timers. It contains 16 pin dual in line package. The temperature range of the NE555 timer is from 0 °C to +70 °C.
The SE555 part number is designed for the military purpose with a temperature range from -55 °C to +125 °C. This was accessible for both high reliability metal with low price of epoxy plastic packages. The 555 timer got the name from the three 5 k ohm resistors, but the number was assumed as an arbitrary and it is a hypothesized. In the 555 timer there is a low power version like 7555 and the COMS TLC555.