SN74HC21N TI Dual 4 Input AND Gate IC DIP-14 Pack10 Wide 2-6V LowPwr

Description

Product Overview

The SN74HC21N is a high‑speed CMOS logic integrated circuit from Texas Instruments that integrates two independent 4‑input AND gates within a single 14‑lead DIP package. Its design targets a broad supply voltage spectrum, operating reliably from 2 V up to 6 V, which accommodates both low‑power battery‑driven systems and higher‑voltage industrial environments. The device exhibits a typical propagation delay of 11 ns, delivering swift logical transitions that are essential for timing‑critical applications. Each gate can source or sink up to 4 mA at a 5 V supply, allowing it to drive up to ten LSTTL loads, thereby providing flexibility when interfacing with a variety of downstream logic families.

In addition to speed, the SN74HC21N is engineered for power efficiency. Its quiescent current does not exceed 20 µA, a figure that helps minimize overall system power consumption, especially in applications where many gates operate continuously. The DIP‑14 footprint is deliberately chosen for ease of use on standard breadboards, prototype boards, and automated surface‑mount assembly lines, ensuring that designers can move from concept to functional hardware with minimal rework. The package is RoHS‑compliant, reflecting TI’s commitment to environmentally responsible manufacturing, and it meets rigorous quality standards required for industrial and scientific equipment.

The IC’s pin configuration follows a logical layout that simplifies wiring and reduces the chance of errors during assembly. Detailed pin‑out diagrams and timing charts are provided in the official datasheet, enabling engineers to accurately predict behavior under various loading conditions. The device also includes built‑in protection features that guard against over‑voltage and electrostatic discharge, further enhancing reliability in harsh operating environments.

Usage

These dual AND gates are ideally suited for constructing combinational logic functions in a wide range of industrial control systems, instrumentation, and data‑acquisition hardware. Engineers frequently employ the SN74HC21N to implement address decoding schemes, enable logic, and safety interlocks where multiple input conditions must be simultaneously true before an action is permitted. The wide voltage tolerance enables the part to be used in battery‑powered remote sensors as well as in mains‑derived power supplies, making it a versatile component for both portable and stationary equipment.

Because of its low quiescent current, the IC is an excellent choice for remote sensor nodes that need to conserve energy while still providing rapid logical decisions. The fast 11 ns propagation delay ensures that even time‑sensitive control loops respond promptly, reducing latency in feedback systems. The DIP‑14 format simplifies integration into test rigs, development kits, and educational laboratory setups, allowing students and professionals alike to prototype complex logic circuits without the need for custom PCBs.

Typical application examples include:
• Multiplexed signal routing where several control lines must be combined.
• Generation of enable signals for power‑stage drivers that require multiple safety conditions.
• Implementation of state‑machine logic in programmable logic controllers (PLCs).
• Creation of custom decoding logic for microcontroller peripheral interfaces.
These scenarios benefit from the device’s ability to handle multiple inputs while maintaining low power draw and high switching speed.

Why Choose Us

Selecting the SN74HC21N from Texas Instruments guarantees access to a component backed by decades of semiconductor expertise and a global support network. The device is fabricated in a state‑of‑the‑art cleanroom that adheres to ISO‑9001 and ISO‑14001 standards, ensuring consistent performance, traceability, and environmental responsibility. TI provides comprehensive documentation, including detailed datasheets, application notes, reference designs, and simulation models, which accelerate development time and reduce design risk.

Our distribution channels offer the part in a convenient pack of ten, delivering cost‑effective bulk purchasing for original equipment manufacturers (OEMs), system integrators, and hobbyist developers. Fast, reliable shipping combined with responsive technical assistance means you can count on timely delivery and expert guidance throughout your project lifecycle. In addition, TI’s extensive warranty and reliability testing programs give confidence that the component will perform as specified over the long term, even in demanding industrial environments.

By partnering with us, you also gain access to value‑added services such as custom packaging options, volume discounts, and on‑demand inventory management, all designed to streamline your supply chain and keep your production schedules on track.

Key Features

• Dual 4‑input AND gates enable compact implementation of complex logic conditions.
• Wide 2 V‑to‑6 V operating range supports diverse power environments.
• Low 20 µA quiescent current reduces overall system power consumption.
• Fast 11 ns typical propagation delay ensures high‑speed switching.
• Pack of ten units with dedicated technical support for rapid prototyping.

FAQ

What is the maximum number of loads each gate can drive?

Each AND gate can reliably drive up to ten LSTTL (Low‑Power Schottky TTL) loads, providing ample fan‑out capability for most logic interfacing needs.

Can the SN74HC21N be used in 5 V LSTTL circuits?

Yes, the device is fully compatible with 5 V LSTTL logic levels, and its output drive capability meets the required current specifications for such applications.

Is the device suitable for battery‑operated applications?

Absolutely. With a supply voltage range starting at 2 V and a maximum quiescent current of only 20 µA, the SN74HC21N is well‑suited for low‑power, battery‑powered designs.

How does the DIP‑14 package aid in prototyping?

The DIP‑14 form factor allows easy insertion into standard breadboards and prototype boards, enabling quick testing and iteration without the need for custom PCB layouts.