7404 Hex Inverting NOT Gate IC | Pro Tronix

Product Description

The 7404 Hex Inverting NOT Gate IC is one of the most widely used fundamental digital logic integrated circuits, featuring six independent logic inverters in a single compact chip. Operating on the principle of Boolean NOT logic, each gate inverts its input signal—converting a HIGH logic state to a LOW output, and a LOW logic state to a HIGH output.

Engineered for fast logic switching speeds and reliable performance on a standard 5V DC supply, the 7404 connects directly to standard 5V TTL and CMOS logic families. Logic inverters are essential building blocks across virtually all digital systems, used for signal phase inversion, logic level buffering, active-LOW control line generation, square-wave clock oscillators, and switch debouncing. Housed in a standard 14-pin DIP package, it interfaces effortlessly with microcontrollers like Arduino, STM32, and ESP32, or discrete digital circuits. It is an indispensable component for any electronics laboratory, prototyping setup, or digital logic training kit.

⚠️ Output Drive & Unused Inputs Tip: Standard TTL inputs draw current when pulled LOW. Always tie unused input pins (Pins 1, 3, 5, 9, 11, or 13) directly to VCC (+5V) or Ground (GND) to prevent floating gate outputs, unnecessary power dissipation, and line noise. Never connect two inverter outputs together in parallel without current-limiting resistors.

Technical & Logic Architecture

This hex inverter IC provides complete logic phase inversion capabilities:

• Six Independent Gates: Six fully isolated NOT logic inverter circuits (Gates 1 through 6) in one package.

• Fast Propagation Delay: Typical switching times under 10 nanoseconds for high-speed digital pulse handling.

• Standard TTL Voltage Compatibility: Operates on a standard 5V DC supply with standard TTL input/output logic thresholds.

• Breadboard-Friendly Package: Standard 14-pin Dual In-Line Package (DIP-14) for easy insertion into breadboards and IC sockets.

7404 Truth Table (Function Table)

Key Terms for Truth Table:

• H: High Voltage Level (Logic 1 / VCC)

• L: Low Voltage Level (Logic 0 / GND)

7404 Pinout Description & Logic Functions

• Pin 1 – Input 1A: Digital input line for NOT Gate 1.

• Pin 2 – Output 1Y: Inverted digital output line for NOT Gate 1.

• Pin 3 – Input 2A: Digital input line for NOT Gate 2.

• Pin 4 – Output 2Y: Inverted digital output line for NOT Gate 2.

• Pin 5 – Input 3A: Digital input line for NOT Gate 3.

• Pin 6 – Output 3Y: Inverted digital output line for NOT Gate 3.

• Pin 7 – GND: Ground reference pin (0V).

• Pin 8 – Output 4Y: Inverted digital output line for NOT Gate 4.

• Pin 9 – Input 4A: Digital input line for NOT Gate 4.

• Pin 10 – Output 5Y: Inverted digital output line for NOT Gate 5.

• Pin 11 – Input 5A: Digital input line for NOT Gate 5.

• Pin 12 – Output 6Y: Inverted digital output line for NOT Gate 6.

• Pin 13 – Input 6A: Digital input line for NOT Gate 6.

• Pin 14 – VCC: Positive power supply input pin (+5V DC nominal).

Operating Modes Summary

1. Signal Inversion (NOT Logic): Flips incoming binary logic states instantly (HIGH becomes LOW, LOW becomes HIGH).

2. Clock Pulse Generation: Connect an odd number of inverter gates (e.g., 3 gates) in a closed feedback loop with a capacitor and resistor to create a simple RC ring oscillator clock.

3. Control Line Polarity Match: Converts active-HIGH enable signals into active-LOW trigger pulses for memory, counters, and peripheral chips.

Applications

• Signal Phase Inversion: Correcting polarity alignment between microcontrollers and active-LOW peripheral modules.

• Square-Wave Oscillators: Generating basic clock pulses for timing circuits and tone generators.

• Switch Debouncing & Buffering: Conditioning mechanical push-button signals to deliver clean, bounce-free logic edges.

Technical Specifications

What’s in the Box

• 1 x 7404 Hex Inverting NOT Gate IC (DIP-14).

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🛠️ Complete Your Breadboard Setup

To quickly wire and test the 7404 Hex Inverting NOT Gate IC without soldering, make sure to check out our collection of breadboards, prototype boards, and jumper wires:

• Breadboards & Prototype PCBs: Explore our full range of solderless breadboards and prototyping boards for easy circuit assembly: Pro Tronix Breadboards & PCBs

• Jumper Wires & Connecting Cables: Grab high-quality male-to-male and male-to-female jumper wires to connect your IC pins to power and signal lines: Pro Tronix Wires & Cables Collection