DM74ALS520WMX Equivalent & Substitute Parts

Part Overview

The DM74ALS520WMX is an 8-bit magnitude comparator with active low output (A=B function) manufactured by onsemi in a 20-SOIC package. This component is classified as obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications. The part operates within the 4.5V to 5.5V supply voltage range and is designed for logic-level comparison operations in digital systems.

Substiute Parts

DM74ALS520WMX

onsemiIn Stock: 928DM74ALS520WMX Datasheet

Current PartRFQ

SN74ALS520DW

Texas InstrumentsIn Stock: 747SN74ALS520DW Datasheet

DirectRFQ

SN74ALS520NSR

Texas InstrumentsIn Stock: 752SN74ALS520NSR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the DM74ALS520WMX is determined by strict equivalence across the following critical parameters:

• Functional Type: Identity Comparator with 8-bit comparison capability
• Output Configuration: Active Low output with A=B function
• Electrical Specifications: 4.5V to 5.5V supply voltage, 2.6mA/24mA output current, 20ns propagation delay at 5V with 50pF load
• Operating Temperature Range: 0°C to 70°C
• Package Compatibility: 20-SOIC or 20-SO surface mount packages
• Series Compatibility: 74ALS logic family

The substitute parts listed below maintain functional and electrical equivalence while offering active product status and improved compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

SN74ALS520DW (Texas Instruments) is the primary direct substitute for the DM74ALS520WMX. This part maintains identical package dimensions (20-SOIC, 0.295" width), electrical specifications, and functional characteristics. The SN74ALS520DW carries active product status and ROHS3 compliance certification, providing long-term availability and regulatory alignment for new designs and production continuity.

SN74ALS520NSR (Texas Instruments) is a functionally equivalent alternative with identical electrical performance and operating parameters. This part differs in package width (0.209" versus 0.295"), supplied in Tape & Reel format. The SN74ALS520NSR is suitable for applications where the narrower package footprint is acceptable and tape-and-reel packaging is preferred for automated assembly processes. ROHS3 compliance is maintained.

Both Texas Instruments substitutes provide active product status, ensuring continued availability and technical support compared to the obsolete onsemi part.

Frequently Asked Questions (FAQ)

Q: Can SN74ALS520DW directly replace DM74ALS520WMX without circuit modification?

A: Yes. The SN74ALS520DW maintains identical electrical specifications, output characteristics, and package pinout. No circuit modifications are required for direct substitution.

Q: What is the difference between SN74ALS520DW and SN74ALS520NSR?

A: Both parts are functionally and electrically equivalent. The primary difference is package width: SN74ALS520DW uses a 0.295" wide 20-SOIC package, while SN74ALS520NSR uses a 0.209" wide 20-SO package. Additionally, SN74ALS520DW is supplied in Tube packaging, while SN74ALS520NSR is supplied in Tape & Reel format.

Q: Are there any compliance differences between the substitute parts and the original?

A: The Texas Instruments substitutes (SN74ALS520DW and SN74ALS520NSR) carry ROHS3 compliance certification. The original onsemi part does not specify RoHS status. Both substitutes maintain REACH Unaffected status and EAR99 ECCN classification consistent with the original part.

Q: Which substitute should I select for new production designs?

A: SN74ALS520DW is recommended for new designs requiring the standard 0.295" package width. SN74ALS520NSR is suitable if the narrower 0.209" package footprint is compatible with your PCB layout and automated assembly equipment supports tape-and-reel feeding.

Q: Are the propagation delay and output current specifications identical across all three parts?

A: Yes. All three parts maintain identical propagation delay (20ns @ 5V, 50pF load) and output current specifications (2.6mA high, 24mA low), ensuring equivalent timing performance in digital comparison applications.