DM74AS20N NAND Gate IC Equivalent & Substitute Parts

Part Overview

The DM74AS20N is a dual 4-input NAND gate logic IC manufactured by onsemi in 14-MDIP packaging. This component is classified as obsolete, making substitute parts necessary for new designs and ongoing production requirements. The 74AS logic family provides standard TTL-compatible switching functionality with specified propagation delays suitable for general-purpose digital logic applications.

Substiute Parts

DM74AS20N

onsemiIn Stock: 961DM74AS20N Datasheet

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SN74AS20N

Texas InstrumentsIn Stock: 3480SN74AS20N Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the DM74AS20N is determined by strict equivalence across the following critical parameters:

• Logic configuration: Dual 4-input NAND gate topology
• Electrical specifications: Supply voltage range 4.5V ~ 5.5V, output current ratings 2mA/20mA, input logic thresholds 0.8V/2V
• Timing characteristics: Maximum propagation delay at specified load conditions
• Operating temperature range: 0°C ~ 70°C
• Physical form factor: 14-DIP through-hole package with 0.300" (7.62mm) pitch
• Series compatibility: 74AS logic family

The SN74AS20N from Texas Instruments meets all substitution criteria within these defined parameters.

Parameter Comparison

Engineering Selection Recommendations

The SN74AS20N is a direct functional equivalent to the DM74AS20N across all specified electrical and mechanical parameters. The primary distinction is product lifecycle status: the DM74AS20N is obsolete, while the SN74AS20N maintains active production status from Texas Instruments.

The SN74AS20N additionally provides ROHS3 compliance, addressing regulatory requirements for new designs and manufacturing environments subject to RoHS directives. Both parts share identical logic configuration, voltage specifications, current ratings, input thresholds, and package form factor, enabling direct substitution in through-hole applications.

The propagation delay specification of the SN74AS20N (5ns) is within acceptable tolerance relative to the DM74AS20N (4.5ns) for standard 74AS logic applications.

Frequently Asked Questions (FAQ)

Q: Can the SN74AS20N replace the DM74AS20N in existing designs?

A: Yes. Both parts are 74AS series dual 4-input NAND gates with identical logic configuration, supply voltage range (4.5V ~ 5.5V), output current specifications (2mA/20mA), input logic levels (0.8V/2V), and 14-DIP through-hole packaging. The SN74AS20N propagation delay (5ns) is compatible with DM74AS20N timing requirements (4.5ns).

Q: What is the difference in RoHS compliance between these parts?

A: The DM74AS20N is RoHS non-compliant, while the SN74AS20N is ROHS3 compliant. For applications subject to RoHS regulations or customer requirements, the SN74AS20N is the appropriate selection.

Q: Are the package dimensions identical?

A: Yes. Both parts use 14-DIP packaging with 0.300" (7.62mm) pitch, enabling direct physical substitution on through-hole PCBs without layout modifications.

Q: Why is the DM74AS20N listed as obsolete?

A: Obsolescence reflects the manufacturer's discontinuation of this specific part number. The SN74AS20N from Texas Instruments provides equivalent functionality and remains in active production.

Q: What are the critical parameters for substitution?

A: Substitution is valid when the following parameters match: logic type (NAND gate), circuit count (2), input count (4), supply voltage range (4.5V ~ 5.5V), output current ratings (2mA/20mA), input logic thresholds (0.8V/2V), operating temperature (0°C ~ 70°C), and package form factor (14-DIP).