7404 Integrated Circuit (IC): Datasheet, Pinout, Pin Diagram

7 min readJul 19, 2024

The 7404 IC, also known as the hex inverter, is comprised of six independent inverters, each capable of transforming logic high signals to logic low and vice versa. Its versatility makes it an indispensable building block for numerous applications, ranging from basic logic gates to more complex digital circuits. As an integral part of the 7400 series, this IC plays a crucial role in the construction and implementation of various digital circuits. We delve into the specifics of the 7404 IC, providing essential information including its pinout, pin diagram, and truth table.

7404 Integrated Circuit Description

The 7404 full name is 7404 Hex Inverter, which indicates that it is a member of the 7400 series and specifically functions as a hex inverter.

The 7404 hex inverter, a vital component within the 7400 series of TTL integrated circuits, stands out in digital electronics for its fundamental capability to invert input signals. Beyond its basic operation, the hex inverter’s features enhance its applicability across various electronic devices.

With six independent inverters, each with a single input and output, the 7404 is meticulously engineered to operate within a 5-volt supply voltage range, accommodating a maximum current of 40 milliamps. Its versatility is emphasized by the availability of different packages, including the widely used DIP and the compact SOIC packages.

The 7404 hex inverter’s adaptability makes it suitable for a diverse array of applications, from basic logic circuits to pulse generators and power inverters. Its reliability and low power consumption make it ideal for battery-powered devices. Noteworthy for its simplicity and user-friendly design, the hex inverter adheres to a standard pinout and operates seamlessly with a single 5V supply, facilitating integration into various circuits for applications ranging from breadboard prototypes to DIY electronics projects.

7404 Integrated Circuit Absolute Maximum Ratings

Supply Voltage

Input Voltage

5.5V

Operating Free Air Temperature

0°C to +70°C

Storage Temperature Range

-65°C to +150°C

7404 Integrated Circuit Features

Six Hex Inverters

The 7404 IC integrates six independent hex inverters into a single package, providing multiple inverters in one unit.

Outputs Directly Interface to CMOS, NMOS, and TTL

The outputs of the 7404 are designed to directly interface with various logic families, including CMOS, NMOS, and TTL, offering versatility in circuit integration.

Large Operating Voltage Range

The IC operates over a large voltage range, accommodating diverse voltage levels within the specified limits.

Wide Operating Conditions

Designed to function effectively across a wide range of operating conditions, providing reliability and stability in diverse environments.

Not Recommended for New Designs

The 7404 is labeled as “Not Recommended for New Designs,” indicating that it is considered outdated or may have newer alternatives available in the market.

Use 74LS04

The recommendation to use the 74LS04 suggests that, for new designs, it is advisable to opt for the 74LS04 variant rather than the standard 7404. This may be due to improvements in the LS (Low-power Schottky) series, which offers advantages in terms of power consumption and performance.

7404 Hex Inverter IC Specifications

Specification

Value

Maximum Current Output

8mA

Supply Voltage Range

4.75V to 5.25V

Operating Temperature Range

0°C to 70°C

Maximum Supply Voltage

Maximum Rise Time

15ns

Maximum Fall Time

15ns

Output Type

TTL

Lead-Free

Yes

7404 Datasheet

7404 Hex Inverter Datasheet

7404 Pinout

The 7404 IC, or the 7404 Hex Inverter, features a straightforward pinout configuration. It consists of six independent inverters, each represented by a specific pin.

Pin Description:

1A (Input): Input for the first inverter.

1Y (Output): Output for the first inverter.

2A (Input): Input for the second inverter.

2Y (Output): Output for the second inverter.

3A (Input): Input for the third inverter.

3Y (Output): Output for the third inverter.

4A (Input): Input for the fourth inverter.

4Y (Output): Output for the fourth inverter.

5A (Input): Input for the fifth inverter.

5Y (Output): Output for the fifth inverter.

6A (Input): Input for the sixth inverter.

6Y (Output): Output for the sixth inverter.

GND (Ground): Ground reference for the IC.

VCC (Supply Voltage): Positive supply voltage (usually +5V).

IC 7404 Pin Diagram

7404 IC Truth Table

The truth table for the 7404 Hex Inverter outlines the relationship between the input and output states for each of its six inverters. In general, an inverter (NOT gate) produces an output that is the logical complement of its input.

Input (A)

Output (Y)

This truth table applies to each of the six inverters within the 7404 IC. When the input (A) is 0, the output (Y) is 1, and vice versa.

Function of 7404 IC

The 7404 IC functions as a NOT gate, and its primary purpose is to invert the input signals.

NOT Gate Operation

The 7404 IC contains six individual NOT gates, also known as inverters.

Each inverter performs a logical inversion on its input signal.

Logical Inversion

The output of each inverter is the logical complement (opposite) of its input state.

When the input is high (1), the output is low (0), and when the input is low (0), the output is high (1).

Universal Logic Function

The NOT gate is a fundamental building block in digital logic circuits.

It can be used to construct more complex logical operations and is a key component in the design of various electronic systems.

Six Independent Inverters

The 7404 IC conveniently integrates six independent inverters into a single package.

Each inverter within the IC operates autonomously, allowing for multiple inversion functions in one unit.

7404 IC serves as a versatile NOT gate, providing logical inversion for six independent signals. Its simplicity and ubiquity make it a fundamental component in digital electronics and a crucial building block for constructing various logical functions and circuits.

Applications of the 7404 Hex Inverter

Logic Gates

The 7404 hex inverter is widely employed in the creation of logic gates, such as NAND and NOR gates. When multiple inverters are combined, they can form the building blocks for more complex logical operations.

Oscillators

In oscillator circuits, the 7404 hex inverter is utilized to generate periodic waveforms. Its ability to invert signals is harnessed to create oscillating outputs, crucial in clock generation and frequency synthesis.

Power Supplies

The 7404 is often integrated into power supply circuits to manage and control signals. Its role in logic inversion proves valuable in maintaining stable power supply conditions.

LED Drivers

The 7404 hex inverter is utilized in LED driver circuits where it helps control and drive LEDs. Its ability to invert signals is leveraged to manage the switching of LEDs efficiently.

Appliances Using Logical Inverters

Appliances with logical inverters, such as consumer electronics, may utilize the 7404 for various control and signal processing tasks.

Memory Units and Storage Applications

In memory units and storage applications, the 7404 can play a role in signal conditioning and control within the digital storage and retrieval processes.

PCs and Notebooks

The 7404 hex inverter may find application in PCs and notebooks for tasks involving logical signal processing, interfacing, or control functions.

Various Digital Electronics

Its broad compatibility and simplicity make the 7404 suitable for a myriad of digital electronic applications, providing logical inversion where needed.

Networking Gadgets and Systems

In networking devices and systems, the 7404 may be used for signal conditioning, logic processing, or interfacing within the broader digital communication framework.

Digital Systems

The 7404 hex inverter is a fundamental component in the design of digital systems, contributing to logical operations, signal conditioning, and control functions.

Advantages and Disadvantages of 7404 Hex Inverter

Advantages

Disadvantages

Low Power Consumption

Limited Output Current

High Noise Immunity

Limited Voltage Range

Easy to Use

Not Suitable for High-Speed Applications

Low Cost

7404 Equivalents

The IC 7404, being a part of the 74XXX series, has equivalents and replacements that serve similar functions in various applications. Two common alternatives to the 7404 are the CD7404 and 74LS14.

CD7404

The CD7404 is functionally equivalent to the 7404, serving as a hex inverter with six independent inverters. It is generally compatible with circuits designed for the 7404 and can often be used as a drop-in replacement.

74LS14

The 74LS14 is another equivalent to the 7404, providing six inverters with Schmitt-trigger inputs. The Schmitt-trigger inputs can offer better noise immunity in certain applications compared to the standard 7404.

Note:

Pin Compatibility: When replacing the 7404 with equivalents, it’s crucial to ensure pin compatibility to facilitate a seamless substitution.

Voltage and Current Ratings: Check voltage and current ratings to confirm that the replacement can handle the specific requirements of the circuit.

Additional Features: Depending on the application, consider whether additional features, such as Schmitt-trigger inputs in the 74LS14, may be advantageous.

Final Words

7404 Integrated Circuit stands as a stalwart in the world of digital electronics, providing a fundamental tool for circuit designers and electronic enthusiasts alike. Through this datasheet, we have explored the essential details encompassing the 7404 IC, from its pinout and pin diagram to its truth table, shedding light on its operational intricacies. As technology continues to advance, the 7404 IC remains relevant and applicable, contributing to the construction of diverse digital circuits.