SN74ALS20ANS

Overview

The SN74ALS20ANS is a dual 4-input positive-NAND gate from the Texas Instruments ALS logic family, housed in a 14-pin Small Outline Package (NS). It operates within a supply voltage range of 4.5 V to 5.5 V and supports an operating temperature range of 0°C to 70°C. The device features a low-level output current capability of 8 mA and a high-level output current of -0.4 mA. Propagation delays are specified between 3 ns and 12.5 ns for low-to-high transitions, and 3 ns to 11 ns for high-to-low transitions under standard load conditions.

Feature Summary

• Contains two independent 4-input positive-NAND gates performing Boolean functions Y = A · B · C · D
• Utilizes bipolar technology with push-pull outputs for robust signal driving
• Compatible with standard TTL input voltage levels

Applications

• Digital logic circuit design requiring multi-input NAND operations
• Microprocessor-based systems utilizing standard logic families
• General-purpose combinatorial logic applications

Procurement Notes

Verify that the ordering suffix 'ANSR' corresponds to the SOP package and tape-and-reel packaging configuration. Confirm RoHS compliance status and lead finish specifications against the latest manufacturer documentation prior to procurement. Ensure the component meets the required catalog rating for commercial temperature ranges.

Selection Notes

Select this component when dual 4-input NAND functionality is required within the ALS series performance envelope. Consider the SOP package dimensions for surface-mount assembly constraints. Evaluate propagation delay requirements against the specified maximum values to ensure timing compatibility with the target system clock speeds.

Part Context

This part belongs to the SN74ALS20A series, which includes variants such as SN74ALS20AN (PDIP) and SN74ALS20ADR (SOIC). The ALS family offers improved speed-power product characteristics compared to earlier standard logic families. The device is categorized as a single-function gate within the broader logic IC portfolio.

Replacement Considerations

SN74ALS20AD is listed as obsolete; SN74ALS20ADR serves as an active production alternative in the SOIC package.