DM74ALS273MSAX Equivalent & Substitute Parts

Part Overview

The DM74ALS273MSAX is a Flip Flop 1 Element D-Type 8 Bit Positive Edge logic integrated circuit manufactured by onsemi in a 20-SSOP surface mount package. This device functions as a master reset flip-flop with non-inverted outputs, operating at a clock frequency of 35 MHz. The part is classified as obsolete, making identification of compatible substitute components essential for ongoing design support and procurement.

Substiute Parts

DM74ALS273MSAX

onsemiIn Stock: 1070DM74ALS273MSAX Datasheet

Current PartRFQ

SN74ALS273NSR

Texas InstrumentsIn Stock: 2814SN74ALS273NSR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the DM74ALS273MSAX is determined by strict equivalence across the following critical parameters:

• Base product number (74ALS273)
• Functional classification (Master Reset D-Type Flip Flop)
• Bit configuration (1 Element, 8 Bits per Element)
• Output polarity (Non-Inverted)
• Electrical specifications (Clock Frequency: 35 MHz, Supply Voltage: 4.5V ~ 5.5V, Operating Temperature: 0°C ~ 70°C)
• Trigger mechanism (Positive Edge)
• Current and propagation delay characteristics (2.6mA/24mA output, 15ns @ 5V, 50pF)

The SN74ALS273NSR from Texas Instruments meets all substitution criteria. While the package format differs (20-SOIC versus 20-SSOP), both packages maintain identical pin pitch, electrical connectivity, and mechanical footprint compatibility for surface mount applications. The substitute part is classified as active product status with full RoHS3 compliance.

Parameter Comparison

Engineering Selection Recommendations

The SN74ALS273NSR is the qualified substitute for the obsolete DM74ALS273MSAX. Selection is based on the following factors:

Product Status: The DM74ALS273MSAX is classified as obsolete. The SN74ALS273NSR maintains active product status, ensuring long-term availability and manufacturing support.

Compliance and Certifications: Both parts carry identical REACH and ECCN classifications (REACH Unaffected, EAR99). The substitute part achieves RoHS3 compliance, meeting current environmental and regulatory requirements.

Electrical and Functional Equivalence: All critical electrical parameters, functional specifications, and performance characteristics are identical between the main part and substitute, including clock frequency, propagation delay, supply voltage range, output current ratings, and operating temperature range.

Package Compatibility: While the package designations differ (20-SSOP versus 20-SOIC), both maintain the same 0.209" width and 5.30mm pitch, ensuring mechanical and electrical compatibility in surface mount applications.

Frequently Asked Questions (FAQ)

Q: Can the SN74ALS273NSR directly replace the DM74ALS273MSAX in existing designs?

A: Yes. Both parts are electrically and functionally equivalent across all specified parameters. The package format difference (SSOP versus SOIC) does not affect compatibility, as both maintain identical pin pitch and surface mount footprint dimensions.

Q: What is the primary reason for substitution?

A: The DM74ALS273MSAX is classified as obsolete. The SN74ALS273NSR is an active product from Texas Instruments, providing assured long-term availability and manufacturing continuity.

Q: Are there any compliance differences between the two parts?

A: No. Both parts share identical REACH and ECCN classifications. The substitute part additionally meets RoHS3 compliance requirements.

Q: Do the parts have identical electrical performance?

A: Yes. Clock frequency (35 MHz), propagation delay (15ns @ 5V, 50pF), supply voltage range (4.5V ~ 5.5V), output current ratings (2.6mA/24mA), quiescent current (20 mA), and operating temperature range (0°C ~ 70°C) are identical.

Q: What is the moisture sensitivity level for both parts?

A: Both parts are classified as MSL 1 (Unlimited), indicating no moisture sensitivity restrictions for storage or handling.

Q: Are there any package considerations for PCB layout?

A: Both packages maintain identical pin pitch and width specifications (0.209", 5.30mm). Existing PCB layouts designed for the 20-SSOP package are compatible with the 20-SOIC substitute without modification.