DM74LS20N NAND Gate IC Equivalent & Substitute Parts

Part Overview

The DM74LS20N is a dual 4-input NAND gate logic IC manufactured by onsemi in 14-pin DIP packaging. This component is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing system maintenance, repair, and legacy design support. The 74LS series represents a mature logic family with well-established cross-manufacturer compatibility standards.

Substiute Parts

DM74LS20N

onsemiIn Stock: 3285DM74LS20N Datasheet

Current PartRFQ

SN74LS20N

MotorolaIn Stock: 4506SN74LS20N Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the DM74LS20N is determined by strict equivalence across the following parameters:

• Logic Function: Dual 4-input NAND gate configuration
• Electrical Specifications: Supply voltage range (4.75V ~ 5.25V), input/output logic levels, and output drive capability
• Timing Characteristics: Propagation delay performance at specified load conditions
• Package Compatibility: 14-pin DIP form factor with 0.300" (7.62mm) pitch
• Series Classification: 74LS logic family designation

The SN74LS20N manufactured by Motorola meets all substitution criteria within these defined parameters.

Parameter Comparison

Engineering Selection Recommendations

Both the DM74LS20N and SN74LS20N are classified as obsolete products. Selection between these parts should be based on:

• Availability: Verify current inventory status with suppliers, as obsolete components have limited stock
• RoHS Compliance: Both parts are RoHS non-compliant; applications requiring RoHS compliance must source alternative modern logic families
• Regulatory Status: Both parts carry identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications
• Functional Equivalence: The SN74LS20N is a direct functional substitute with identical electrical and timing characteristics within specified operating conditions

For new designs, consider modern logic families that provide equivalent functionality with current manufacturing support and compliance certifications.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS20N directly replace the DM74LS20N in existing circuits?

A: Yes. Both parts are 74LS series dual 4-input NAND gates with identical logic function, electrical specifications, and 14-DIP packaging. Direct pin-for-pin substitution is supported.

Q: Are there differences in propagation delay between these parts?

A: Both parts specify 15ns maximum propagation delay at 5V. The SN74LS20N is characterized at 15pF load while the DM74LS20N is characterized at 50pF load. This difference reflects measurement conditions and does not affect functional compatibility.

Q: What is the significance of the obsolete product status?

A: Obsolete status indicates these components are no longer in active production. Sourcing is limited to existing inventory. For long-term applications, evaluation of modern logic family alternatives is recommended.

Q: Are both parts suitable for new designs?

A: Both parts are obsolete and not recommended for new designs. Modern CMOS logic families offer superior power efficiency, wider supply voltage ranges, and current manufacturing support. Existing legacy systems may continue to use these parts for maintenance and repair purposes.

Q: What packaging considerations apply to these parts?

A: Both parts use identical 14-pin DIP packaging with 0.300" (7.62mm) pitch. Through-hole mounting is required. PCB footprints and socket compatibility are identical between the two parts.