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4017 Decade Counter/Divider CMOS IC
The CD4017 is a CMOS decade counter/divider IC that sequentially activates one of ten outputs (Q0–Q9) on each rising edge of the clock input. Widely used in ...
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The CD4017 is a CMOS decade counter/divider IC that sequentially activates one of ten outputs (Q0–Q9) on each rising edge of the clock input. Widely used in LED chasers, sequencers, and timing circuits, it's one of the most popular CMOS logic ICs for hobby electronics.
The IC features a clock input, clock enable, and reset pin, making it easy to build sequential circuits with minimal external components. Each output goes high in turn while all others remain low.
Key Features
- Decade Counter – 10 decoded outputs (Q0–Q9), one active at a time
- Carry Out – Cascading output for chaining multiple counters
- Clock Enable and Reset – Full control over counting sequence
- CMOS Logic – Low power consumption, wide voltage range
Specifications
- IC Number – CD4017 / HEF4017
- Package – 16-pin DIP (through-hole)
- Supply Voltage – 3V to 15V DC
- Logic Family – CMOS
Ideal For
- LED chaser and sequencer circuits
- Frequency dividers
- Timer and counting applications
- Educational logic circuit projects
Package Contents
- 1× CD4017 Decade Counter/Divider CMOS IC
Jargon buster
Plain-language definitions for the technical terms used above.
- DC
- DC means direct current, where electricity flows in one constant direction, as supplied by batteries, USB ports and many plug-pack power supplies. When a product specifies DC, it runs from a DC supply rather than mains AC, so you need to provide the correct voltage and polarity.
- LED
- A light-emitting diode (LED) is a small electronic component that emits light when current flows through it in the correct direction. Because it only conducts one way, its polarity matters, and a through-hole LED must be soldered the correct way around to light up.
- through-hole
- A mounting style where the component leads pass through holes in a circuit board and are soldered on the other side. Through-hole parts are often easier to handle and solder by hand, which is useful for classroom and hobby projects.
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