SN74F21D

Overview

The SN74F21D is a dual four-input AND gate integrated circuit manufactured by Texas Instruments. It operates within a supply voltage range of 4.5V to 5.5V and features a propagation delay of 5.1ns at 5V with 50pF load capacitance. The device supports output currents of 1mA (high) and 20mA (low), with a maximum static current of 4.3mA. It is housed in a 14-SOIC surface-mount package and functions reliably across a commercial temperature range of 0°C to 70°C.

Feature Summary

• Dual independent four-input AND logic gates
• Fast switching speed with low propagation delay
• Standard TTL-compatible input and output levels
• Robust drive capability for interfacing applications

Applications

• Digital logic control circuits
• Data encoding systems
• Address decoding networks
• General-purpose logic gating

Procurement Notes

Verify the specific suffix against official datasheets to confirm package type and tape/reel specifications. Ensure compatibility with existing board layouts regarding pinout and thermal requirements. Confirm RoHS compliance status if required by project regulations. Cross-reference ordering information with authorized distributors to avoid counterfeit components.

Selection Notes

Select this component when fast switching speeds are required compared to standard LS series alternatives. Consider the SOIC package for surface-mount assembly constraints. Evaluate power consumption needs as F-series devices draw higher static current than HC or HCT variants. Ensure the 5V supply rail matches the system's operating voltage profile.

Part Context

This part belongs to the Texas Instruments 74F series, known for high-speed performance in digital logic applications. It serves as a successor to earlier 74S series technologies while offering improved speed over standard 74LS counterparts. The device is widely used in systems requiring rapid logical processing within tight timing constraints.

Replacement Considerations

SN74F21DR