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555 Upside Down: Duty Cycles Down to Zero
June 8, 2026
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Is it possible to come up with a useful new circuit configuration for an IC that has been used several hundred billion times over the past 55 years? Let’s find out.
As of 2026, world’s best-selling integrated circuit is still the NE555 timer IC designed by Swiss electronics engineer Hans Rudolph Camenzind (1934–2012). It has held this position almost since its introduction by Signetics in 1972. Of course, heaped together, op-amps and microcontrollers are used more, but that’s when you count every reference from every manufacturer. The NE555, or simply “555”, is the most-used single-reference IC. It is also the first IC I have ever worked with myself.
The 555 is found in applications varying from timers and oscillators to power supplies, audio amplifiers, and more. However, even though the 555 is a very versatile device, it does have several practical limitations. One of them is that, when used in the standard astable multivibrator configuration, the minimum duty cycle is sligh...
As of 2026, world’s best-selling integrated circuit is still the NE555 timer IC designed by Swiss electronics engineer Hans Rudolph Camenzind (1934–2012). It has held this position almost since its introduction by Signetics in 1972. Of course, heaped together, op-amps and microcontrollers are used more, but that’s when you count every reference from every manufacturer. The NE555, or simply “555”, is the most-used single-reference IC. It is also the first IC I have ever worked with myself.
The 555 is found in applications varying from timers and oscillators to power supplies, audio amplifiers, and more. However, even though the 555 is a very versatile device, it does have several practical limitations. One of them is that, when used in the standard astable multivibrator configuration, the minimum duty cycle is sligh...
