Description

 

 

 

 

The 7408 DIP Quad 2-Input Logic AND Gate is one of the most essential and widely used ICs (Integrated Circuits) in digital electronics. Belonging to the 74xx TTL (Transistor-Transistor Logic) family, this IC contains four independent 2-input AND gates that perform the logical AND operation — a foundational function in digital logic design. The 7408 is a key building block for students, engineers, and hobbyists working with logic circuits, digital systems, and embedded projects.

At its core, the AND gate is a basic logic element that outputs HIGH (1) only when all its inputs are HIGH (1). Otherwise, it outputs LOW (0). This simple yet powerful operation forms the basis for more complex digital designs like control systems, counters, decoders, and arithmetic circuits. The 7408 IC houses four such gates within a single 14-pin Dual Inline Package (DIP), offering efficiency, compactness, and high-speed performance.

Key Features:

• 💡 Logic Family: TTL (Transistor-Transistor Logic)

• ⚙️ Configuration: Quad 2-input AND gates (4 gates per IC)

• 🔋 Operating Voltage Range: Typically 4.75V to 5.25V (Standard 5V logic)

• ⚡ High Noise Immunity ensures stable performance even in complex circuits.

• 🔌 Output Drive Capability: Can drive standard TTL loads.

• 🔥 Fast Switching Times: Ideal for high-speed digital systems.

• 🧩 14-Pin DIP Package: Easy to handle, breadboard-friendly, and perfect for prototyping.

• 🧠 Fan-out of 10: Can drive multiple TTL inputs simultaneously.

• 🌡️ Operating Temperature Range: 0°C to +70°C

Pin Configuration:

The 7408 IC has a 14-pin dual inline layout, where:

• Pins 1, 2 → Inputs of Gate 1

• Pin 3 → Output of Gate 1

• Pins 4, 5 → Inputs of Gate 2

• Pin 6 → Output of Gate 2

• Pin 7 → Ground (GND)

• Pins 8, 9 → Inputs of Gate 3

• Pin 10 → Output of Gate 3

• Pins 11, 12 → Inputs of Gate 4

• Pin 13 → Output of Gate 4

• Pin 14 → Vcc (+5V Power Supply)

This pin layout is standard across most 74xx series logic ICs, making it intuitive for circuit design and breadboard use.

Electrical Characteristics:

• Input Voltage (HIGH): Minimum 2V

• Input Voltage (LOW): Maximum 0.8V

• Output Current (HIGH): -0.4mA

• Output Current (LOW): 8mA

• Propagation Delay: Typically 10ns

• Power Dissipation: Approximately 2mW per gate

These parameters highlight the IC’s reliability and suitability for a wide range of digital applications.

Applications:

The 7408 Quad AND Gate IC is a must-have in digital electronics due to its versatility. Common applications include:

• ✅ Logic Control Systems – Used in automation and decision-making logic.

• ✅ Digital Comparators – To combine and compare binary signals.

• ✅ Data Processing Circuits – Helps perform binary AND operations in ALUs (Arithmetic Logic Units).

• ✅ Signal Gating – Enables control of signal flow based on logical conditions.

• ✅ Timing Circuits – Used in synchronization and pulse control logic.

• ✅ Digital Counters & Decoders – Core element in complex sequential logic.

• ✅ Educational Projects & Prototyping – Perfect for students learning digital fundamentals.

How It Works:

Each AND gate inside the 7408 takes two digital inputs (logic 0 or 1). The output will only be HIGH (1) if both inputs are HIGH. If any one (or both) input(s) are LOW (0), the output remains LOW (0).

For example:

This truth table summarizes the AND logic function implemented by each gate in the IC.

Advantages:

• Simple integration with microcontrollers and digital systems.

• Low power consumption and fast response time.

• Available in DIP format — ideal for breadboard and PCB use.

• Widely supported by simulation software and tutorials.

• Robust and affordable component for logic design projects.

Typical Use Example:

Suppose you’re building a system that should turn ON an LED only when two sensors send a HIGH signal. You can easily implement this condition using one of the AND gates from the 7408 IC. If both inputs (from the sensors) are HIGH, the LED turns ON — otherwise, it remains OFF.

Package Includes:

• 1 × 7408 DIP Quad 2-Input Logic AND Gate IC

Conclusion:

The 7408 DIP Quad 2-Input Logic AND Gate is a compact, durable, and indispensable IC for anyone involved in digital electronics design. Whether you are a student, educator, or professional engineer, the 7408 provides reliable performance and a solid foundation for building logical and control-based systems. With its high-speed switching, low power consumption, and TTL compatibility, it’s an essential component for digital labs, automation projects, and electronic experiments.

 

7408 AND Gate Datasheet

7408 AND Gate Truth Table: 7408 AND Gate Datasheet:Package Included:

• 1 X 7408 DIP Quad 2-Input Logic AND Gate