page_title: 555 timer IC
hierarchical_section_title: 555 timer IC
caption_attribution_description: English: Signetics NE555N, the original 555 type oscillator, in a dual-in-line plastic package, manufactured in 1978 (work week 28)
context_page_description: The 555 timer IC is an integrated circuit used in a variety of timer, delay, pulse generation, and oscillator applications. Derivatives provide two or four timing circuits in one package. It was commercialized in 1972 by Signetics and it was reported to still be in wide use as of 2013. Numerous companies have made the original bipolar timers and similar low-power CMOS timers too. In 2017, it was said over a billion 555 timers are produced annually by some estimates, and "probably the most popular integrated circuit ever made."
context_section_description: The 555 timer IC is an integrated circuit (chip) used in a variety of timer, delay, pulse generation, and oscillator applications.  Derivatives provide two (556) or four (558) timing circuits in one package. It was commercialized in 1972 by Signetics and it was reported to still be in wide use as of 2013. Numerous companies have made the original bipolar timers and similar low-power CMOS timers too.  In 2017, it was said over a billion 555 timers are produced annually by some estimates, and "probably the most popular integrated circuit ever made."
caption: Signetics NE555 in 8-pin DIP package
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