74HC21D

Overview

The Toshiba Semiconductor and Storage 74HC21D is a dual 4-input AND gate integrated circuit manufactured in the 74HC series. It operates within a supply voltage range of 2V to 6V, with logic high levels from 1.5V to 4.2V and logic low levels from 0.5V to 1.8V. The device features a maximum static supply current of 1 µA and output currents of 5.2mA for both high and low states. It is housed in a 14-SOIC package with a width of 3.90mm. The maximum propagation delay is 17ns at 6V with a 50pF load capacitance. The component supports surface mount installation and functions across an operating temperature range of -40°C to 85°C.

Feature Summary

• Dual four-input AND gate configuration providing two independent logic channels within a single package.
• CMOS technology enabling low quiescent supply current and high noise immunity for reliable digital signal processing.
• Wide operating voltage capability supporting standard logic interfaces across varying power supply conditions.

Applications

• Digital logic circuits requiring multi-input AND operations
• Microprocessor system address decoding
• Control logic for embedded systems

Procurement Notes

Verify the specific manufacturer part number against official Toshiba Semiconductor and Storage documentation to confirm pinout compatibility and electrical specifications. Ensure the selected variant matches the required 14-SOIC package dimensions and thermal characteristics. Confirm that the component's operating temperature range aligns with the intended environmental conditions of the final assembly.

Selection Notes

Select this component when a dual 4-input AND function is required in a compact surface-mount form factor. Consider the 74HC series performance characteristics regarding speed and power consumption relative to other logic families. Verify that the input voltage thresholds are compatible with the driving source logic levels to ensure proper signal integrity and switching behavior.

Part Context

The 74HC21D belongs to the widely adopted 74HC (High-speed CMOS) logic family, known for compatibility with TTL inputs while offering improved speed over standard HC devices. Manufactured by Toshiba Semiconductor and Storage, it serves as a fundamental building block in digital electronics. The SOIC-14 package provides a balance between pin count and board space efficiency for general-purpose logic applications.

Replacement Considerations

Cross-reference with equivalent parts such as HD74HC21T-EL or 74HC21D,653 to verify functional compatibility. Ensure substitute components match the 14-pin SOIC package and meet the same electrical parameters for voltage, current, and propagation delay.