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Hans Camenzind, the Swiss-born analog engineer who designed the 555 timer integrated circuit, died in August 2012 at age 78. He created the chip in 1971 under contract to Signetics; the company brought it to market in 1972. The 555 remains in production and is used for timing, pulse generation and oscillation.
Who was Hans Camenzind?
Camenzind was an analog integrated-circuit engineer, entrepreneur and technical author. Born and raised in Zurich, he moved to the United States in 1960 and studied at Northeastern University and the University of Santa Clara. His career included work at Transitron, Tyco Semiconductor, P.R. Mallory and Signetics. In 1971, he founded InterDesign, through which he designed the 555 for Signetics. He later sold InterDesign, worked as an independent consultant through Array Design, and wrote books on electronics and its history.
The Computer History Museum credits Camenzind with more than 150 chip designs. Accounts also credit him with 20 patents. His work extended beyond the 555 to phase-locked-loop integrated circuits and what sources describe as the first integrated class-D amplifier.
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What did Camenzind contribute with the 555?
The 555 put several timing functions into an inexpensive, adaptable chip. Engineers can configure it in monostable, astable or bistable mode: for a single timed pulse, a repeating oscillation, or a circuit that holds one of two states. It can generate pulses and serve as a basic timer or oscillator, with external components setting its behavior.
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- Timing From Microseconds to Hours
- Astable or Monostable Operation
- Adjustable Duty Cycle
- TTL-Compatible Output Can Sink or Source up to 200 mA
The Computer History Museum describes the original design as containing 23 transistors, 15 resistors and two diodes. That compact set of on-chip components helped make the IC practical for many designs without requiring a large or specialized circuit. The Semiconductor Museum’s oral history records uses ranging from toys to spacecraft electronics.
Why did the 555 become so widely used?
Its flexibility made the same basic part useful in many different projects, from simple hobby circuits to commercial electronics. It was approachable for students and hobbyists while remaining useful to engineers, and its timing and pulse-generation roles made it easy to adapt with a small number of external components.
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- Model: NE555
- Voltage: 4.5V-18V
- Current: 10~15 mA
- Output current (maximum): 225 mA
- Rise/fall time: 100 ns
In a 2003 oral-history interview, Camenzind reflected on the chip’s reach: “That 555 family was a total surprise. I wanted to make it flexible, that was the whole purpose, but I didn’t realize it was so flexible.” The Semiconductor Museum’s 2004 oral-history page reports that more than one billion 555 units were sold worldwide in 2003 alone; that is a figure for that year, not a current annual sales rate. The Computer History Museum says the part remains in production and that sales have reached the billions.
When did Hans Camenzind die?
Camenzind died in his sleep in August 2012, aged 78. Published accounts disagree about the exact date: the Computer History Museum, a family memorial and Electronic Design give August 8, while EE Times and EDN report August 15. The available accounts do not establish a more specific medical cause.
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- 🔴 161 pcs 20 models, Each with individual compartment. Pin assignment table included.
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- ALLECIN NE555 NE555P Timer - commonly used electronic components.
- Voltage: 4.5V-18V ; Current:10mA.
- Features & Advantages: Precise timekeeping accuracy & High-quality materials & Good temperature stability & Wide delay range.
- Widely Application: NE555 NE555P Timer is widely used in various applications.
- Humanized packaging for easy storage and use. # Printed markings for easy identification.
Rank #3
- Our pack includes 25 premium NE555 integrated circuits, designed for astable and monostable operation. These precision timers deliver consistent performance across microsecond to hour timing ranges, ideal for a vast array of electronic applications.
- Features adjustable duty cycle and TTL-compatible outputs capable of sinking or sourcing up to 200mA. Perfect for building pulse generators, oscillators, timers, alarms, LED flashers, and countless hobbyist and professional circuits.
- Each NE555 chip comes in an 8-pin dual in-line (DIP-8) package, compatible with breadboards, perfboards, and standard PCB sockets for easy prototyping and installation.
- Reliably operates from 4.5V to 15V DC, ensuring stable performance with common power supply configurations for both hobbyist and industrial electronic designs.
- Economical bulk pack of 25 pieces, perfect for electronic hobbyists, students, makers, and professionals. Stock up for multiple projects, repairs, and classroom experiments with high-quality, dependable components.
Sources and further reading
- Computer History Museum: Hans Camenzind memorial and 555 history
- EE Times: Hans Camenzind obituary
- Electronic Design: Hans Camenzind obituary
- The Semiconductor Museum: Hans Camenzind oral history
- All About Circuits: 555 timer circuit overview
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