The 74HC04 contains six independent inverters, also known as NOT gates. The function of this IC is simple: it reverses the logic state of the input. If the input is HIGH, the output is LOW, and vice versa. This IC is fundamental for digital signal processing, creating timing delays, and buffering signals. Because it contains six separate gates in one small package, it is a highly efficient way to manage logic inversion across multiple data lines in a single circuit.
74HC04 Pinout (DIP-14)
The 74HC04 provides six inverters in a 14-pin package.
| Pin | Terminal | Function |
| 1 | 1A | Input 1 |
| 2 | 1Y | Output 1 |
| 3 | 2A | Input 2 |
| 4 | 2Y | Output 2 |
| 5 | 3A | Input 3 |
| 6 | 3Y | Output 3 |
| 7 | GND | Ground (0V) |
| 8 | 4Y | Output 4 |
| 9 | 4A | Input 4 |
| 10 | 5Y | Output 5 |
| 11 | 5A | Input 5 |
| 12 | 6Y | Output 6 |
| 13 | 6A | Input 6 |
| 14 | VCC | Positive Supply (2V to 6V) |
Technical Specifications
- Supply Voltage Range (VCC): 2.0V to 6.0V
- Input Voltage (VI): 0V to VCC
- Output Current (IOUT): ±25mA per gate
- Propagation Delay: ~7ns to 13ns
- Quiescent Current: 2µA (Typical)
- Transition Time: 6ns to 15ns
Key Features & Benefits
- Six-in-One Design: High density of gates in a single 14-pin package.
- Buffering Capability: Can be used to clean up “noisy” digital signals.
- Low Static Power: Draws almost no current when not switching states.
- Wide Voltage Range: Works with 3.3V and 5V systems.
Common Applications
- Logic Inversion: Reversing the state of sensors or switches (Active-Low to Active-High).
- Clock Pulse Generators: Used in crystal oscillators and astable multivibrators.
- Data Buffering: Preventing signal degradation over long wire traces.
- Digital Delay Lines: Creating very short timing delays in logic sequences.
74HC04 Equivalent & Substitutes
- 74LS04 (Older TTL version)
- 74HCT04 (TTL-compatible CMOS)
- CD4069 (Standard CMOS Hex Inverter)
- 74AC04 (Advanced CMOS version for higher speeds)
Related Tutorials on ElxHub
- Basics: Learn more in Integrated Circuits – Basics and Working
- Logic Gates: Explore our Guide to Logic Inverters and Buffers
- Selection Guide: Compare logic options in our Ultimate IC Selection Guide
Conclusion
The 74HC04 is one of the most frequently used logic ICs due to its simplicity and utility. Whether you need to flip a signal for a microcontroller or build a high-frequency clock, the 74HC04 provides a fast, efficient, and low-power solution. Its versatility makes it a “breadboard staple” for any digital electronics project.
Download the IC’s Datasheet pdf
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