DM74ALS20AN NAND Gate IC Equivalent & Substitute Parts

Part Overview

The DM74ALS20AN is a dual 4-input NAND gate logic IC manufactured by onsemi in 14-MDIP packaging. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part operates within the 4.5V to 5.5V supply voltage range and is suitable for through-hole mounting applications in digital logic circuits.

Substiute Parts

DM74ALS20AN

onsemiIn Stock: 2261DM74ALS20AN Datasheet

Current PartRFQ

SN74ALS20AN

Texas InstrumentsIn Stock: 2252SN74ALS20AN Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DM74ALS20AN is determined by strict equivalence across the following critical parameters:

• Logic configuration: Dual 4-input NAND gate architecture
• Electrical specifications: 4.5V to 5.5V supply voltage, 400µA/8mA output current ratings, 0.8V/2V input logic thresholds
• Timing characteristics: Maximum propagation delay performance at specified load conditions
• Physical form factor: 14-DIP through-hole package with 0.300" (7.62mm) pitch
• Series classification: 74ALS logic family

The SN74ALS20AN from Texas Instruments meets all substitution criteria within these defined parameters.

Parameter Comparison

Engineering Selection Recommendations

The SN74ALS20AN is a direct functional equivalent to the DM74ALS20AN. Both components share identical logic architecture, electrical characteristics, and physical packaging. The SN74ALS20AN maintains active product status with Texas Instruments, ensuring continued availability and supply chain reliability. The SN74ALS20AN carries RoHS3 compliance certification, whereas the DM74ALS20AN does not specify RoHS status. Both parts are REACH unaffected and classified under ECCN EAR99. The maximum propagation delay of the SN74ALS20AN (12.5ns) is marginally higher than the DM74ALS20AN (11ns), remaining within acceptable tolerance for most 74ALS logic applications. Pin-for-pin compatibility and identical package dimensions ensure direct board-level substitution without design modification.

Frequently Asked Questions (FAQ)

Q: Can the SN74ALS20AN replace the DM74ALS20AN in existing designs?

A: Yes. Both parts are pin-for-pin compatible with identical electrical specifications, logic configuration, and 14-DIP package dimensions. Direct substitution is possible without circuit modification.

Q: What is the difference in propagation delay between these parts?

A: The DM74ALS20AN specifies 11ns maximum propagation delay at 5V with 50pF load, while the SN74ALS20AN specifies 12.5ns under identical conditions. This 1.5ns difference is within typical 74ALS logic tolerances and does not affect functional compatibility in standard applications.

Q: Are there packaging differences between the DM74ALS20AN and SN74ALS20AN?

A: Both parts use 14-DIP (0.300", 7.62mm) through-hole packaging. The DM74ALS20AN is supplied in standard packaging, while the SN74ALS20AN is supplied in tube packaging. The physical dimensions and pin configuration are identical.

Q: What compliance certifications apply to the SN74ALS20AN?

A: The SN74ALS20AN is RoHS3 compliant and REACH unaffected. Both parts are classified under ECCN EAR99 and HTSUS 8542.39.0001.

Q: Why is the DM74ALS20AN listed as obsolete?

A: Obsolete status indicates that onsemi has discontinued active production and support for this part number. The SN74ALS20AN from Texas Instruments provides continued availability of equivalent 74ALS20 NAND gate functionality.