74HCT03D,653 Quad 2-Input NAND Gate – Open-Drain (SOIC-14)

Description

The 74HCT03D is a high-speed, silicon-gate CMOS logic device containing four independent 2-input NAND gates with open-drain outputs. Unlike standard totem-pole (push-pull) outputs, the open-drain configuration allows the output to pull LOW (to Ground) but requires an external pull-up resistor to reach a logic HIGH state. This architecture is highly flexible, making it ideal for “wired-AND” logic configurations and level-shifting applications where the pull-up resistor can be connected to a voltage rail different from the IC’s supply voltage ($V_{CC}$).

The device is part of the HCT series, ensuring compatibility with standard TTL logic levels while maintaining the low power consumption and high noise immunity of CMOS technology. Additionally, the inputs are equipped with clamp diodes, allowing the use of current-limiting resistors to safely interface with input signals that exceed the $V_{CC}$ level.

Note: Product images are for illustrative purposes only. Since this device features open-drain outputs, an external pull-up resistor is mandatory to achieve a logic HIGH level. Please refer to the official Nexperia datasheet for guidance on selecting appropriate pull-up resistor values based on your desired output switching speed and current requirements.

Features

• Quad NAND Logic: Four independent 2-input NAND gates in a single 14-pin package.
• Open-Drain Outputs: Provides the flexibility to interface with different voltage levels and implement wired-AND logic.
• Clamp Diodes: Integrated input protection allows for interfacing with voltages higher than $V_{CC}$ when using current-limiting resistors.
• TTL Compatibility: Input threshold levels are designed for seamless operation with TTL-level signaling.
• Wide Operating Range: Robust design suitable for temperatures from -40°C to +125°C.
• Package: SOIC-14 (SMD) for standard surface-mount PCB assembly.

Benefits

• Voltage Flexibility: Open-drain outputs enable easy level translation by pulling up to an external voltage rail.
• Wired-AND Logic: Simplifies complex logic by allowing multiple outputs to be connected together on a single line.
• System Reliability: High-temperature stability and integrated input protection ensure durable operation in industrial and automotive environments.

Applications

• Wired-AND Logic: Implementing shared bus structures where multiple gates drive a common signal line.
• Level Shifting: Converting between different logic voltage domains (e.g., 5V to 3.3V).
• Open-Drain Drivers: Driving peripherals like LEDs or relays that require a switch to ground.
• General Control Logic: Essential for building combinatorial logic networks that require high signal flexibility.

Package Includes

• 1 x 74HCT03D,653 Quad 2-Input NAND Gate IC (SMD-14)

Specifications