4001 Quad 2-Input NOR Gate IC – CD4001 CMOS Digital Logic Gate

Overview

The 4001 (CD4001) is a CMOS integrated circuit containing four independent 2-input NOR gates. In digital logic, a NOR gate outputs a “High” signal only when both of its inputs are “Low.” This IC is renowned for its versatility and robustness. Unlike the 74-series TTL logic, which requires a strict 5V, the 4001 can run on anything from a small 3.7V Li-ion battery to a 15V power rail, making it perfect for battery-operated IoT devices and industrial control circuits.

Key Features

• Quad-Gate Architecture: Four independent logic gates in one 14-pin package.

• Wide Voltage Range: Operates reliably from 3V to 18V, allowing for direct use with various battery types.

• High Noise Immunity: Excellent performance in “noisy” electrical environments (near motors or relays).

• Buffered Outputs: Provides high gain and excellent frequency characteristics for clean signal switching.

• Low Power Consumption: CMOS technology ensures minimal current draw, extending the life of portable projects.

Technical Specifications

Common Applications

• SR Latches: Create simple memory cells for “Start/Stop” buttons.

• Square Wave Oscillators: Build clock generators using just a few resistors and capacitors.

• Signal Inversion: Use a single NOR gate as a NOT gate (inverter) by tying the inputs together.

• Control Logic: Processing sensor signals in robotics and automation projects.