NXP HEF4081BT: Quad 2-Input AND Gate IC Datasheet, Application Circuit, and Specifications

The HEF4081BT from NXP Semiconductors is a monolithic integrated circuit fabricated in CMOS technology, housed in a compact SO14 package. It belongs to the HEF4000B logic family, which is pin-compatible with many standard 4000-series ICs. This device contains four independent 2-input AND gates in a single package, making it a fundamental building block for a vast array of digital logic applications where a high logical '1' output is only required when all inputs are high.

Key Specifications and Datasheet Overview

The HEF4081BT operates over a wide voltage range, typically from 3 V to 15 V, offering significant flexibility for various digital systems. Its key electrical characteristics include:

Supply Voltage Range (VDD): -0.5 V to +15 V (Absolute Maximum Ratings)

Recommended Operating Voltage: 3.0 V to 15.0 V

High Noise Immunity: Approximately 45% of VDD at VDD = 10 V

Low Power Consumption: Quiescent current of just 4.0 µA (typ.) at 5 V, making it ideal for battery-powered devices.

Operating Temperature Range: -40 °C to +85 °C, suitable for industrial-grade applications.

Output Drive Capability: 10 LS-TTL loads at 5 V supply voltage.

The device features buffered outputs, which provide improved noise margin and symmetric transition times. Like all CMOS ICs, unused inputs must never be left floating and should be tied to either VDD or VSS (ground) to prevent erratic behavior and excessive power consumption.

Typical Application Circuit

A primary use case for a quad AND gate like the HEF4081BT is in the construction of basic gating or enable circuits. The following example demonstrates how one of its four gates can be used as a control gate for a signal.

In this circuit, one input (e.g., Input A) is connected to a digital data signal (e.g., a clock or pulse train). The second input (Input B) is connected to an enable/control signal. The output will only mirror the data present on Input A when the enable signal (Input B) is at a logic high level. When the enable is low, the output remains low regardless of the state of the data signal. This simple function is crucial for controlling the flow of data within a larger digital system, such as a microprocessor or communication interface.

Why Choose the HEF4081BT?

The HEF4081BT offers a reliable and cost-effective solution for implementing the AND logic function. Its key advantages are its wide operating voltage range, which allows interfacing with both 5V TTL and modern 3.3V CMOS logic levels, and its exceptionally low power consumption. The integration of four gates in one package saves valuable board space and simplifies circuit design and inventory management.

ICGOODFIND Summary

The NXP HEF4081BT is a versatile and robust quad 2-input AND gate IC from the 4000-series family. Its strengths lie in its wide voltage supply range (3V-15V), very low static power consumption, and high noise immunity, making it a perennial choice for designers working on everything from simple hobbyist projects to complex industrial control systems requiring basic digital logic gating.

Keywords: AND Gate, CMOS Logic, HEF4000B Family, Low Power Consumption, Wide Voltage Range