DM74AS280MX Equivalent & Substitute Parts

Part Overview

The DM74AS280MX is a 9-bit parity generator/checker logic integrated circuit manufactured by onsemi in 14-SOIC surface mount packaging. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement. The 74AS280 series provides parity generation and checking functionality for digital systems requiring error detection in 9-bit data paths.

Substiute Parts

DM74AS280MX

onsemiIn Stock: 1062DM74AS280MX Datasheet

Current PartRFQ

SN74AS280NSR

Texas InstrumentsIn Stock: 2822SN74AS280NSR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the DM74AS280MX is determined by the following critical parameters:

• Logic Type: Parity Generator/Checker (9-Bit functionality)
• Voltage Supply Range: 4.5 V ~ 5.5 V
• Output Current Specifications: 2mA (High), 20mA (Low)
• Operating Temperature Range: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Base Product Number: 74AS280 series

The SN74AS280NSR from Texas Instruments meets all functional and electrical requirements for direct substitution. Both parts implement identical logic functionality within the same voltage and temperature specifications. Package variations (14-SOIC width differences) are within industry-standard tolerances for surface mount assembly.

Parameter Comparison

Engineering Selection Recommendations

The SN74AS280NSR is the primary substitute for the obsolete DM74AS280MX. Both components share identical electrical specifications, logic functionality, and operating parameters. The SN74AS280NSR maintains active product status with Texas Instruments, ensuring long-term availability and supply chain continuity.

The package width difference (3.90mm versus 5.30mm) represents a standard variation within 14-SOIC specifications and does not affect electrical performance or pin compatibility. PCB layout adjustments may be required to accommodate the wider package footprint.

The SN74AS280NSR carries ROHS3 compliance certification, providing environmental and regulatory advantages over the original part. Both components maintain MSL Level 1 moisture sensitivity ratings, indicating unlimited shelf life under standard storage conditions.

Frequently Asked Questions (FAQ)

Q: Can the SN74AS280NSR directly replace the DM74AS280MX without circuit modifications?

A: Yes. Both parts implement identical 9-bit parity generator/checker logic with matching voltage supply ranges (4.5 V ~ 5.5 V), output current specifications (2mA, 20mA), and operating temperature ranges (0°C ~ 70°C). Pin configuration and electrical behavior are equivalent.

Q: What is the significance of the 14-SOIC package width difference?

A: The DM74AS280MX uses a 0.154" (3.90mm) wide package, while the SN74AS280NSR uses a 0.209" (5.30mm) wide package. Both are standard 14-SOIC variants. PCB footprint adjustments are necessary during layout design, but electrical performance remains unchanged.

Q: Why is the DM74AS280MX classified as obsolete?

A: Obsolete status indicates the manufacturer (onsemi) has discontinued production. The SN74AS280NSR from Texas Instruments remains in active production, making it the recommended long-term solution for new designs and component replenishment.

Q: Are there compliance differences between these parts?

A: The SN74AS280NSR carries ROHS3 compliance certification. Both parts maintain MSL Level 1 ratings and REACH Unaffected status. The SN74AS280NSR provides enhanced environmental compliance for applications requiring regulatory adherence.

Q: What inventory considerations apply to these substitutes?

A: The DM74AS280MX has 1,032 pieces available as new original stock. The SN74AS280NSR has 2,801 pieces available, providing greater supply availability and reducing procurement lead times.