DM74ALS520N Equivalent & Substitute Parts

Part Overview

The DM74ALS520N is an 8-bit magnitude comparator with identity output (A=B) in a 20-pin DIP package, manufactured by onsemi. This logic component is classified as obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications. The part operates with active-low output logic and is designed for digital comparison operations in TTL-compatible systems.

Substiute Parts

DM74ALS520N

onsemiIn Stock: 2188DM74ALS520N Datasheet

Current PartRFQ

SN74ALS520N

Texas InstrumentsIn Stock: 2357SN74ALS520N Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DM74ALS520N is determined by strict equivalence across the following critical parameters:

• Functional Identity: 8-bit magnitude comparator with A=B output function
• Logic Family: 74ALS series with active-low output configuration
• Electrical Specifications: Supply voltage 4.5V ~ 5.5V, output currents 2.6mA/24mA, propagation delay 20ns @ 5V with 50pF load
• Package Compatibility: 20-pin DIP (0.300", 7.62mm) through-hole mounting
• Operating Range: 0°C ~ 70°C temperature specification

The SN74ALS520N from Texas Instruments meets all these criteria and qualifies as a direct substitute.

Parameter Comparison

Engineering Selection Recommendations

The SN74ALS520N from Texas Instruments is the direct equivalent for the obsolete DM74ALS520N. Selection of the Texas Instruments part is supported by:

• Product Status: The SN74ALS520N maintains active product status, ensuring continued availability and supply chain reliability.
• Regulatory Compliance: The SN74ALS520N is ROHS3 compliant, meeting current environmental and regulatory requirements.
• Electrical Equivalence: All functional and electrical parameters are identical to the original part.
• Package Compatibility: Identical 20-DIP through-hole package enables direct board-level substitution without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the SN74ALS520N replace the DM74ALS520N in existing designs?

A: Yes. The SN74ALS520N is electrically and functionally equivalent across all specified parameters, including supply voltage, output characteristics, propagation delay, and operating temperature range. The identical 20-DIP package permits direct substitution.

Q: Are there differences in compliance or certifications between these parts?

A: The SN74ALS520N is ROHS3 compliant, while the DM74ALS520N compliance status is not specified. Both parts are REACH unaffected. The Texas Instruments part meets current regulatory requirements for new designs and production.

Q: What is the significance of the active product status for the SN74ALS520N?

A: Active product status indicates ongoing manufacturing and distribution support from Texas Instruments, ensuring reliable long-term availability and consistent supply for production requirements.

Q: Are there any package or mounting differences?

A: No. Both parts use identical 20-pin DIP (0.300", 7.62mm) through-hole packages and mounting specifications, enabling direct board-level replacement without design modifications.

Q: What are the critical parameters for substitution compatibility?

A: Substitution compatibility is determined by 8-bit identity comparator function, A=B active-low output, 4.5V ~ 5.5V supply voltage, 2.6mA/24mA output currents, 20ns propagation delay at 5V with 50pF load, 0°C ~ 70°C operating temperature, and 20-DIP package configuration.