NXP HEF4071BT Triple 3-Input AND Gate: Datasheet, Application Circuit, and Technical Specifications

The NXP HEF4071BT is a member of the HEF4000 family of integrated circuits, a series renowned for its robust CMOS technology. This specific IC houses three independent 3-input AND gates in a single 14-pin package, providing a compact and efficient solution for implementing fundamental logic functions in a wide array of digital systems. It is designed for operation over a broad voltage range, making it suitable for both industrial and consumer applications.

Technical Specifications

The HEF4071BT operates across a wide supply voltage range from 3V to 15V, offering significant flexibility in interfacing with different logic levels. Key electrical characteristics include:

High Noise Immunity: Typical noise margin of approximately 45% of the supply voltage at 15V.

Low Power Consumption: A very low quiescent current of typically 1 µA at 5V, making it ideal for battery-powered devices.

Symmetrical Output Sourcing and Sinking Capability: The outputs can source and sink current effectively, with a typical output drive of -0.64 mA / 0.64 mA at 15V.

Operating Temperature Range: From -40 °C to +85 °C, ensuring reliable performance in harsh environments.

Standardized Symmetrical Output Characteristics: Ensures predictable performance across all gates.

The device is fully specified for 5V, 7V, and 10V supply voltages, with its performance detailed across the entire voltage and temperature range in its official datasheet.

Application Circuit

A primary application of the AND gate is in address decoding and data gating. A typical circuit configuration involves using the HEF4071BT to enable a specific function only when multiple control signals are active high (logic '1').

For instance, in a simple memory decoding system:

1. Three address lines (A0, A1, A2) from a microcontroller or counter are connected to the three inputs of one of the internal AND gates.

2. The output of this gate is then used as a Chip Select (CS) or enable signal for a peripheral IC (e.g., a memory chip or another I/O device).

3. The peripheral will only be activated when all three address lines are high, effectively selecting that specific device on the shared data bus.

This simple gating mechanism forms the foundation for more complex combinatorial logic, allowing designers to create custom enable conditions from multiple input signals.

Datasheet Overview

The manufacturer's datasheet is the ultimate source of truth for design-in. For the HEF4071BT, it provides:

Absolute Maximum Ratings: Stresses beyond which device damage may occur.

Recommended Operating Conditions: The conditions for intended device operation.

DC and AC Electrical Characteristics: Detailed tables for parameters like propagation delay, transition time, and power consumption at various voltages.

Package Outline Drawings: Mechanical drawings for PCB footprint design (e.g., DIP14 or SO14).

Test Circuits and Graphs: Illustrating performance under dynamic conditions.

ICGOODFIND: The NXP HEF4071BT is a versatile and highly reliable CMOS logic IC. Its wide operating voltage range, exceptionally low power consumption, and robust design make it an excellent choice for implementing basic AND logic in everything from vintage computer restorations to modern, power-sensitive embedded systems. Its triple-gate design offers excellent functional density, simplifying board layout and reducing component count.

Keywords: CMOS Logic IC, AND Gate, Wide Voltage Range, Low Power Consumption, HEF4000 Series