7402 Quad 2-Input NOR Gate IC | Pro Tronix

Product Description

The 7402 Quad 2-Input NOR Gate IC is a fundamental high-speed TTL logic integrated circuit featuring four independent 2-input NOR logic gates in a single compact chip. Operating on the principle of Boolean NOR logic, the output of each gate goes HIGH only when both of its input lines are grounded or LOW, and stays LOW whenever one or both inputs receive a HIGH signal.

Engineered for fast logic propagation speeds and reliable performance on a standard 5V DC supply, the 7402 connects directly to standard 5V TTL and CMOS logic families. NOR gates are universal logic gates, meaning they can be wired in various combinations to recreate any other logic function—including AND, OR, NOT, NAND, and XOR—as well as SR latches and flip-flops. Housed in a standard 14-pin DIP package, it interfaces effortlessly with microcontrollers like Arduino, STM32, and ESP32, or discrete digital circuits. It is an essential component for signal inversion, latching circuits, control logic decoding, and digital logic training kits.

⚠️ Pinout Configuration Tip: Unlike most standard quad 2-input gate ICs (such as the 7400 NAND or 7408 AND gates), the 7402 NOR gate features a reversed pin layout. Outputs are located on Pins 1, 4, 10, and 13, while inputs are paired as (Pin 2, Pin 3), (Pin 5, Pin 6), (Pin 8, Pin 9), and (Pin 11, Pin 12). Always double-check your pin connections before applying power!

Technical & Logic Architecture

This quad 2-input NOR gate provides complete fundamental logic capabilities:

• Four Independent Gates: Four fully isolated 2-input NOR logic circuits (Gates 1 through 4) in one package.

• Universal Gate Capability: Can be configured to build all fundamental logic gates, flip-flops, and clock oscillators.

• Standard TTL Voltage Compatibility: Operates on a standard 5V DC supply with standard TTL input/output switching thresholds.

• Breadboard-Friendly Package: Standard 14-pin Dual In-Line Package (DIP-14) for easy insertion into breadboards and IC sockets.

7402 Truth Table (Function Table)

Key Terms for Truth Table:

• H: High Voltage Level (Logic 1 / VCC)

• L: Low Voltage Level (Logic 0 / GND)

7402 Pinout Description & Logic Functions

• Pin 1 – Output Y1: Digital output line for NOR Gate 1.

• Pin 2 – Input A1: First input line for NOR Gate 1.

• Pin 3 – Input B1: Second input line for NOR Gate 1.

• Pin 4 – Output Y2: Digital output line for NOR Gate 2.

• Pin 5 – Input A2: First input line for NOR Gate 2.

• Pin 6 – Input B2: Second input line for NOR Gate 2.

• Pin 7 – GND: Ground reference pin (0V).

• Pin 8 – Input B3: Second input line for NOR Gate 3.

• Pin 9 – Input A3: First input line for NOR Gate 3.

• Pin 10 – Output Y3: Digital output line for NOR Gate 3.

• Pin 11 – Input B4: Second input line for NOR Gate 4.

• Pin 12 – Input A4: First input line for NOR Gate 4.

• Pin 13 – Output Y4: Digital output line for NOR Gate 4.

• Pin 14 – VCC: Positive power supply input pin (+5V DC nominal).

Operating Modes Summary

1. Standard 2-Input NOR Logic: Produces a HIGH output only when both inputs are LOW.

2. Signal Inversion (NOT Gate): Tie both inputs of a single gate together to use it as a standard logic inverter / NOT gate.

3. Bistable Latch Construction: Cross-couple two NOR gates to form a basic SR (Set-Reset) flip-flop latch circuit.

Applications

• Control Signal Decoding: Inverting active-LOW logic signals and enabling hardware control lines.

• SR Latch & Memory Circuits: Constructing fundamental hardware memory flip-flops and debouncing switches.

• Universal Logic Design: Building custom logic gates and digital functions in training and prototype setups.

Technical Specifications

What’s in the Box

• 1 x 7402 Quad 2-Input NOR Gate IC (DIP-14).

Everything you need for your next project is now available with guaranteed quality and fast shipping across Egypt.. Order now from Pro Tronix!

🛠️ Complete Your Breadboard Setup

To quickly wire and test the 7402 Quad 2-Input NOR Gate IC without soldering, make sure to check out our collection of breadboards, prototype boards, and jumper wires:

• Breadboards & Prototype PCBs: Explore our full range of solderless breadboards and prototyping boards for easy circuit assembly: Pro Tronix Breadboards & PCBs

• Jumper Wires & Connecting Cables: Grab high-quality male-to-male and male-to-female jumper wires to connect your IC pins to power and signal lines: Pro Tronix Wires & Cables Collection