7428 Quad 2-Input NOR Gate IC (DIP)

7428 Quad 2-Input NOR Gate IC (DIP) — Overview

The 7428 Quad 2-Input NOR Gate IC is a reliable, TTL-compatible logic device from the 74xx family. It contains four independent NOR gates, each with two inputs and one output, packaged in a standard DIP-14 form factor. The NOR gate outputs HIGH only when all inputs are LOW, making the 7428 a versatile building block for digital logic, signal inversion, and combinational circuits.

Key Features

• Four independent 2-input NOR gates in one DIP-14 package.
• TTL-compatible inputs and outputs for direct interfacing with standard logic families.
• Operates from a typical 5V supply (Vcc 4.75V to 5.25V).
• Fast switching performance with a typical propagation delay of 10 ns.
• Low quiescent power consumption suitable for battery-powered and low-power designs.
• Easy prototyping on breadboards and simple PCB integration.

Technical Specifications

• IC Number: 7428
• Logic Type: Quad 2-Input NOR Gate
• Number of Gates: 4
• Inputs per Gate: 2
• Outputs per Gate: 1
• Operating Voltage (Vcc): 4.75V to 5.25V (typical 5V)
• Input Current (High): 40 µA (Max)
• Input Current (Low): -1.6 mA (Max)
• Output Current (High): -0.4 mA
• Output Current (Low): 16 mA
• Propagation Delay: 10 ns (Typical)
• Package Type: DIP-14 (Dual Inline Package)
• Operating Temperature Range: 0°C to +70°C

Typical Applications

• Digital logic and combinational circuit design
• Timing and control signal generation
• Arithmetic and logic control systems
• Signal inversion and logic-level operations
• Educational labs, training kits, and classroom experiments
• Embedded system prototyping and breadboard testing

Usage and Design Tips

• Always use a 0.1 µF decoupling capacitor between Vcc and GND close to the IC to reduce noise and improve switching reliability.
• Observe TTL input thresholds and avoid floating inputs; tie unused inputs to defined logic levels.
• Check fanout limitations when driving multiple TTL inputs from a single output; buffer if necessary for higher loads.
• Combine gates within the IC to implement complex logic functions; NOR gates are functionally complete for building any boolean logic using combinations.
• For breadboard prototyping, the DIP-14 package fits standard solderless breadboards and DIP sockets for quick iteration.

Package and Ordering

The 7428 is supplied in a DIP-14 package that simplifies prototyping and replacement in through-hole designs. It is compatible with standard 74xx power rails and mounting options. Please check supplier packaging and minimum order quantities when ordering for production runs.

Note: Images are for illustration purposes only.