CD74HC21E TI Harris CMOS Dual 4‑Input AND Gate IC DIP‑14 Pack of 10

Description

Product Overview

The CD74HC21E is a high‑speed CMOS logic device that combines two independent 4‑input AND gates into a single, compact DIP‑14 package. Designed and manufactured by TI/Harris, this IC leverages silicon‑gate CMOS technology to deliver propagation delays as low as 9 ns while maintaining the low power characteristics typical of CMOS circuits. The device operates over a wide voltage range of 2 V to 6 V, making it compatible with a broad spectrum of digital systems, from low‑power microcontroller interfaces to high‑performance industrial controllers.

One of the standout attributes of the CD74HC21E is its robust fan‑out capability. Each output can drive up to ten standard LSTTL loads or fifteen bus driver loads, ensuring that signal integrity is preserved even in densely populated circuit boards. The IC also features buffered inputs, which provide balanced propagation delay and transition times, reducing the risk of timing errors in complex logic designs. Its temperature range of –55 °C to 125 °C guarantees reliable operation in harsh environments, such as automotive electronics, aerospace instrumentation, and outdoor sensor networks.

Physical dimensions conform to the standard DIP‑14 footprint, allowing for easy insertion into breadboards, prototype boards, and automated assembly lines. The pins are clearly labeled for quick identification, and the package is designed for optimal heat dissipation, further enhancing durability under continuous operation. Whether you are designing a simple logic circuit or a sophisticated digital system, the CD74HC21E provides the performance, flexibility, and reliability required for mission‑critical applications.

Usage

Engineers and hobbyists alike find the CD74HC21E indispensable for a variety of applications. In industrial automation, the dual 4‑input AND gates are frequently employed to implement safety interlocks, ensuring that multiple conditions must be met before a machine can operate. This reduces the likelihood of accidental activation and enhances overall system safety. In scientific instrumentation, the IC is used to combine sensor signals, creating logical conditions that trigger data acquisition or alarm systems when specific thresholds are reached.

Because of its low power consumption, the CD74HC21E is also well‑suited for battery‑powered devices, such as remote monitoring stations and portable diagnostic equipment. The wide operating temperature range enables deployment in extreme environments, from sub‑zero outdoor installations to high‑temperature industrial furnaces. Its compatibility with both LSTTL and CMOS logic families makes it a versatile bridge between legacy systems and modern digital designs, facilitating seamless integration without the need for additional level‑shifting components.

For educational purposes, the CD74HC21E serves as an excellent teaching tool for demonstrating fundamental Boolean logic concepts. Students can experiment with multiple input combinations on a breadboard, observing real‑time changes in output states, which reinforces theoretical knowledge with hands‑on experience. The IC’s clear pinout and reliable performance ensure that learning sessions are both productive and enjoyable.

Why Choose Us

When selecting a logic gate IC for critical applications, quality and reliability are paramount. Our partnership with TI/Harris guarantees that every CD74HC21E unit meets stringent industry standards, including ISO 9001 certification and rigorous testing for electrical performance, thermal stability, and long‑term durability. Each batch undergoes comprehensive screening to verify propagation delay, power consumption, and noise immunity, ensuring that you receive a component that performs exactly as specified.

We understand the importance of timely delivery and consistent supply. Our inventory management system maintains a robust stock of the CD74HC21E, allowing us to fulfill orders quickly, even for large‑scale production runs. In addition, we provide detailed datasheets, application notes, and design guidelines to help you integrate the IC into your projects with confidence.

Customer support is a cornerstone of our service philosophy. Our technical experts are available to assist with schematic reviews, troubleshooting, and optimization recommendations, ensuring that you achieve the best possible results from your design. We also offer flexible return policies and warranty coverage, reflecting our commitment to your satisfaction and long‑term success.

Key Features

• Fast 9 ns propagation delay enables high‑speed digital processing.
• Low power consumption reduces energy costs and extends battery life.
• Wide operating temperature range –55 °C to 125 °C ensures reliability in extreme conditions.
• Strong fan‑out drives multiple LSTTL loads, simplifying circuit design.
• Dedicated technical support and comprehensive documentation for seamless integration.

FAQ

What voltage range does the CD74HC21E support?

The device operates from 2 V up to 6 V, making it compatible with both low‑voltage microcontroller environments and higher‑voltage logic families. This flexibility allows designers to use the same part across a variety of platforms without needing additional voltage regulation.

Can the CD74HC21E be used in high‑noise environments?

Yes. The IC features a noise immunity level (NIL and NIH) of approximately 30 % of VCC, which provides robust protection against transient disturbances and electromagnetic interference. This makes it suitable for industrial settings where electrical noise is common.

How does the fan‑out capability affect circuit design?

With the ability to drive up to ten standard LSTTL loads or fifteen bus driver loads, the CD74HC21E reduces the need for additional buffering stages. Designers can connect multiple downstream devices directly to the output, simplifying board layout and decreasing component count.

Is the CD74HC21E suitable for prototyping on a breadboard?

Absolutely. The DIP‑14 package is breadboard‑friendly, allowing quick insertion and removal for iterative testing. Its clear pin labeling and robust construction make it ideal for rapid development cycles and educational labs.

What warranty or after‑sales service is offered?

We provide a standard one‑year warranty covering manufacturing defects, along with responsive after‑sales support. Our technical team can assist with any integration challenges, ensuring that you get the most out of the CD74HC21E in your applications.