DM74ALS520WM Equivalent & Substitute Parts

Part Overview

The DM74ALS520WM 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 substitute parts necessary for ongoing design support and procurement. The part operates within the 4.5V to 5.5V supply voltage range and is suitable for logic-level comparison applications requiring identity detection across 8-bit data paths.

Substiute Parts

DM74ALS520WM

onsemiIn Stock: 1498DM74ALS520WM Datasheet

Current PartRFQ

SN74ALS520DW

Texas InstrumentsIn Stock: 747SN74ALS520DW Datasheet

DirectRFQ

SN74ALS520NSR

Texas InstrumentsIn Stock: 752SN74ALS520NSR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the DM74ALS520WM is determined by strict equivalence across the following critical parameters:

• Functional Identity: 8-bit magnitude comparator with A=B output function
• Output Configuration: Active low output logic
• Electrical Specifications: 4.5V to 5.5V supply voltage, 2.6mA output high current, 24mA output low current, 20ns maximum 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 with equivalent pinout

Two substitute parts meet these criteria: SN74ALS520DW (Texas Instruments, direct equivalent in 20-SOIC) and SN74ALS520NSR (Texas Instruments, functionally equivalent in 20-SO with different package width specification).

Parameter Comparison

Engineering Selection Recommendations

SN74ALS520DW is the primary substitute for the DM74ALS520WM. Both parts share identical package dimensions (20-SOIC, 0.295" width) and all electrical specifications. The SN74ALS520DW is manufactured by Texas Instruments with active product status and ROHS3 compliance, providing long-term availability and regulatory alignment for new designs.

SN74ALS520NSR is a secondary substitute suitable for applications where tape and reel packaging is preferred. This part maintains functional and electrical equivalence but specifies a narrower package width (0.209" versus 0.295"). PCB layout compatibility must be confirmed before selection, as the reduced package width may affect footprint fit on existing designs.

Both substitutes are manufactured by Texas Instruments and carry ROHS3 compliance certification, addressing environmental and regulatory requirements beyond the obsolete onsemi part.

Frequently Asked Questions (FAQ)

Q: Can SN74ALS520DW directly replace DM74ALS520WM on existing PCBs?

A: Yes. Both parts use identical 20-SOIC packages with 0.295" width and share all electrical specifications. No circuit modifications are required.

Q: What is the difference between SN74ALS520DW and SN74ALS520NSR?

A: Both are functionally equivalent 8-bit identity comparators with identical electrical performance. The primary difference is packaging format: SN74ALS520DW is supplied in tubes, while SN74ALS520NSR is supplied in tape and reel. Additionally, SN74ALS520NSR specifies a narrower package width (0.209" versus 0.295"), which may affect PCB footprint compatibility.

Q: Are the substitute parts RoHS compliant?

A: Yes. Both SN74ALS520DW and SN74ALS520NSR are ROHS3 compliant. The original DM74ALS520WM RoHS status is not specified.

Q: What is the operating temperature range for these comparators?

A: All three parts operate across 0°C to 70°C, suitable for commercial and industrial applications within this temperature envelope.

Q: Can these parts be used interchangeably in high-speed applications?

A: Yes. All three parts share identical maximum propagation delay specifications of 20ns at 5V with 50pF load, ensuring equivalent timing performance in logic comparison circuits.