Logic Gate AND 74HC08

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The 74HC08N is a quad 2-input AND CMOS Gate, a fundamental component used in digital circuits. Most logic gates, including this one, have two inputs and one output. Each terminal of the gate can be in either of the two binary states: low (0) or high (1), represented by different voltage levels. As an AND gate, it performs logical conjunction on its inputs. Specifically, the output of the AND gate is true (high) only when all of its inputs are true (high). If any of the inputs are false (low), the output of the AND gate will also be false (low). it is suitable for various applications in digital systems.


Package Includes:

  • 1 x 74HC08N IC



  1. Quad 2-Input AND Gate: The IC contains four independent 2-input AND gates, allowing for multiple logic operations in a single package.
  2. Digital Logic: It operates as a digital logic gate, processing binary inputs and producing binary outputs (high/low states).
  3. Standard CMOS Technology: Built using Complementary Metal-Oxide-Semiconductor (CMOS) technology, offering low power consumption and improved noise immunity.
  4. Input Compatibility: The device inputs are compatible with Standard CMOS outputs, making it versatile and easy to integrate with other components.
  5. Pullup Resistors: The IC incorporates pullup resistors on the inputs, simplifying connectivity and eliminating the need for external pullup resistors.
  6. High-Speed Operation: Provides high-speed performance, enabling efficient operation in various digital circuits.
  7. Wide Operating Voltage Range: Supports a broad voltage range, allowing for flexibility in different applications.
  8. Pin Compatibility: Identical pinout to the LS08, making it a suitable replacement in existing circuit designs.
  9. Cost-Effective: Offers a cost-effective solution for logical operations, minimizing the component count in digital circuit designs.
  10. Durable Packaging: Available in reliable and robust packaging options, ensuring protection and ease of handling during assembly.
  11. Low Quiescent Current: Consumes low current when not actively switching, contributing to overall power efficiency.
  12. RoHS Compliant: Manufactured following the Restriction of Hazardous Substances (RoHS) guidelines, ensuring environmental compliance.



The 74HC08N stands as a pinnacle of innovation in the realm of digital circuits. As a quad 2-input AND CMOS Gate, this compact integrated circuit (IC) is at the very core of modern electronic systems, revolutionizing the way information is processed and decisions are made within digital devices.

At its heart, this versatile IC houses four independent 2-input AND gates, allowing for multiple logic operations within a single, efficient package. Each gate is a digital logic powerhouse, capable of processing binary inputs and generating binary outputs, represented by the distinct high (1) or low (0) states.

Designed with precision, the 74HC08N employs the efficiency of Complementary Metal-Oxide-Semiconductor (CMOS) technology. This not only ensures low power consumption but also enhances noise immunity, making it an ideal choice for noise-sensitive applications. One of the standout features of the 74HC08N is its seamless integration with other digital components. The device inputs are fully compatible with Standard CMOS outputs, simplifying the integration process and allowing you to unlock its full potential across diverse projects. With user convenience in mind, the IC incorporates pullup resistors on its inputs, streamlining connectivity and eliminating the need for external pullup components. This thoughtful design makes the 74HC08N a time-saving solution that streamlines your circuitry. In a world where speed is paramount, the 74HC08N excels. Its high-speed operation empowers your digital circuits to perform complex operations swiftly and efficiently, ensuring rapid data processing and real-time responsiveness. Moreover, this dynamic IC accommodates a wide operating voltage range, offering the flexibility needed to adapt to various voltage environments, expanding its versatility across different applications. Thanks to its identical pinout with the LS08, the 74HC08N easily finds its place in existing circuit designs, allowing for seamless upgrades and replacements without the need for significant alterations. Incorporating the 74HC08N is not only a powerful choice but a budget-friendly one too. Its cost-effective design optimizes logical operations, minimizing the component count and saving valuable resources in your digital circuit designs.


Principle of Work:

Internally, the 74HC08N quad 2-input AND gate is composed of transistors and other electronic components configured to perform the logical AND operation. Let's understand how it works and how to use it in circuits, along with a truth table to illustrate its functionality. Internal Working: The 74HC08N has four independent AND gates (A, B, C, and D), each with two inputs (A1, B1, C1, and D1) and one output (Y1, Y2, Y3, and Y4). The inputs A1 and B1 (or C1 and D1) of each AND gate are connected in series, and the output of each gate (Y1, Y2, Y3, and Y4) depends on the logical AND operation performed on its respective inputs (A1 and B1, or C1 and D1).

Truth Table: truth table for a single AND gate within the 74HC08N. We'll use A1 and B1 as inputs and Y1 as the output.

A1 B1 Y1
0 0 0
0 1 0
1 0 0
1 1 1

The truth table shows all possible combinations of inputs A1 and B1 and the corresponding output Y1 based on the AND operation. As per the truth table, the output Y1 will be 1 (high) only when both A1 and B1 are 1 (high). If any of the inputs are 0 (low), the output Y1 will also be 0 (low). You can apply this truth table for all four AND gates in the 74HC08N, and the same logic will apply to their respective outputs (Y1, Y2, Y3, and Y4) based on their individual input combinations. By utilizing the internal AND gates and connecting their inputs and outputs as needed, you can create complex logic circuits with the 74HC08N IC, performing various logical operations to meet your specific requirements.


Pinout of the Module:

Pin 1: NC (No Connection)
Pin 2: IN1 (Input 1)
Pin 3: IN2 (Input 2)
Pin 4: NC (No Connection)
Pin 5: NC (No Connection)
Pin 6: GND (Ground)
Pin 7: NC (No Connection)
Pin 8: NC (No Connection)
Pin 9: NC (No Connection)
Pin 10: NC (No Connection)
Pin 11: Y3 (Output 3)
Pin 12: Y2 (Output 2)



  • Logic Gates: The IC is widely used as a basic building block in the construction of more complex logic gates, such as NAND, NOR, and XOR gates.
  • Microprocessors and Microcontrollers: It is used in Microprocessors and microcontrollers to process binary data and perform specific logical operations.
  • Memory Systems: In memory systems, the IC plays a vital role in addressing and decoding data, enabling efficient read and write operations.
  • Control Circuits: It is used in control circuits to implement decision-making logic and enable/disable specific functionalities based on input conditions.
  • Arithmetic Circuits: The IC is utilized in arithmetic circuits to facilitate binary addition, subtraction, and other mathematical operations.
  • Signal Processing: It is employed in signal processing applications where multiple signals need to be combined based on certain conditions.
  • Data Multiplexing: The IC helps in data multiplexing, allowing multiple data inputs to be selectively passed through based on control signals.
  • Data Filtering: It is used in filtering applications to process data based on specific filter criteria.
  • Address Decoding: The IC is used in address decoding circuits to select specific memory locations or peripheral devices.
  • State Machines: It plays a role in state machines to implement sequential logic and control state transitions based on input conditions.



This is a test circuit with LED's to experiment with the IC you can also click on this LINK to simulate the same circuit online.



Technical Details:

  • Supply Voltage (VCC): 2V to 6V
  • High-Level Input Voltage (VIH): 2V to VCC
  • Low-Level Input Voltage (VIL): 0V to 0.8V
  • High-Level Output Current (IOH): -4mA (maximum) at VCC = 2V
  • Low-Level Output Current (IOL): 4mA (maximum) at VCC = 2V
  • Input Capacitance (CI): 3.5pF (typical), 6pF (maximum)
  • Operating Temperature Range: -40°C to +85°C
  • Propagation Delay (tpd): 10ns (typical) at VCC = 5V
  • Quiescent Current (ICC): 1μA (maximum) at VCC = 6V





Comparison between 74HC08N and 74LS08 When choosing between the two, consider factors such as operating voltage, speed requirements, power consumption, and noise immunity. If you are working with modern digital circuits, the 74HC08N is generally a preferred choice due to its advantages in speed and power efficiency. However, if you have specific requirements or are working in a legacy system with TTL logic, the 74LS08 might still be relevant and accessible:

  1. Technology:

    • 74HC08N: Uses High-Speed CMOS (HC) technology, which offers higher speed and lower power consumption compared to the 74LS series.
    • 74LS08: Uses Low-Power Schottky (LS) technology, which has a lower speed and higher power consumption compared to 74HC series.
  2. Supply Voltage Range:

    • 74HC08N: Operates within a wider voltage range of 2V to 6V.
    • 74LS08: Typically operates within a narrower voltage range of 4.75V to 5.25V.
  3. Propagation Delay:

    • 74HC08N: Typically has a shorter propagation delay, providing faster response times in logic operations.
    • 74LS08: Generally has a longer propagation delay compared to the 74HC series, making it slower in logic operations.
  4. Power Consumption:

    • 74HC08N: Consumes lower power due to its CMOS technology.
    • 74LS08: Consumes relatively higher power compared to CMOS-based ICs.
  5. Noise Immunity:

    • 74HC08N: Offers better noise immunity due to its CMOS design.
    • 74LS08: Although the LS series has good noise immunity, it is generally lower than that of CMOS-based ICs.
  6. Input and Output Compatibility:

    • 74HC08N: Compatible with CMOS and TTL logic families, allowing easy integration with various devices.
    • 74LS08: Designed to work with TTL logic levels, which might require level-shifting when interfacing with CMOS devices.
  7. Operating Temperature Range:

    • Both ICs typically operate within the industrial temperature range of -40°C to +85°C.