DM74ALS21AN Equivalent & Substitute Parts

Part Overview

The DM74ALS21AN is a 2-channel AND gate logic IC manufactured by onsemi, housed in a 14-pin DIP package. This component implements dual 4-input AND gate functions and operates within the 4.5V to 5.5V supply voltage range. The DM74ALS21AN is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The SN74ALS21AN from Texas Instruments provides a direct functional and electrical equivalent with active product status.

Substiute Parts

DM74ALS21AN

onsemiIn Stock: 2222DM74ALS21AN Datasheet

Current PartRFQ

SN74ALS21AN

Texas InstrumentsIn Stock: 2830SN74ALS21AN Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DM74ALS21AN with the SN74ALS21AN is valid based on the following criteria:

Electrical Equivalence: Both parts share identical electrical specifications including supply voltage range (4.5V ~ 5.5V), output current ratings (400µA high, 8mA low), input logic thresholds (0.8V low, 2V high), and propagation delay characteristics (15ns @ 5V, 50pF).

Functional Equivalence: Both components implement the same logic function—2-channel AND gate with 4 inputs per channel—within the 74ALS logic family.

Package Compatibility: Both parts use the 14-DIP (0.300", 7.62mm) package with through-hole mounting, ensuring mechanical and electrical pin compatibility on printed circuit boards.

Operating Conditions: Both parts operate across the identical temperature range (0°C ~ 70°C) and maintain equivalent performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

The SN74ALS21AN from Texas Instruments is the recommended substitute for the obsolete DM74ALS21AN. The primary advantage is active product status, ensuring long-term availability and supply chain continuity. Both parts maintain identical electrical and functional specifications, enabling direct replacement without circuit modification.

The SN74ALS21AN carries ROHS3 compliance certification, meeting modern environmental and regulatory requirements. Both components are REACH unaffected, confirming compliance with chemical substance regulations.

For applications requiring the DM74ALS21AN, transition to the SN74ALS21AN provides equivalent performance with improved supply reliability and regulatory alignment.

Frequently Asked Questions (FAQ)

Q: Can the SN74ALS21AN directly replace the DM74ALS21AN without circuit modifications?

A: Yes. Both parts are electrically and functionally equivalent with identical pin configurations, supply voltage requirements, logic thresholds, and propagation delay characteristics. Direct substitution is valid for all applications.

Q: Are there package differences between these parts?

A: No. Both the DM74ALS21AN and SN74ALS21AN use the 14-DIP (0.300", 7.62mm) through-hole package with identical pin assignments and mechanical dimensions.

Q: What is the primary reason for substituting the DM74ALS21AN?

A: The DM74ALS21AN is classified as obsolete. The SN74ALS21AN maintains active product status, ensuring availability for new designs and production continuity.

Q: Do both parts operate across the same temperature range?

A: Yes. Both components operate from 0°C to 70°C, maintaining equivalent performance across the full operating temperature range.

Q: Are there compliance differences between the two parts?

A: The SN74ALS21AN carries ROHS3 compliance certification. Both parts are REACH unaffected. For applications requiring RoHS compliance, the SN74ALS21AN is the appropriate selection.